Menu
Your Cart

WARM ROOF ǀ COLD ROOF

FLAT ROOF INSULATION

Flat roof insulation is a layer of insulation built into the roof structure either below the roof deck or above. Flat roof is understood as a roof that has a pitch of lower than 10 degrees. Insulating a flat roof can result in less energy use, a reduction in condensation, and an overall decrease in related household bills. Flat roof insulation boards are often considered with the Celotex brand being widely popular in the UK. Its TD4000 PIR product is known as a 3 in 1 material designed to provide decking, vapour control layer and insulation for new and refurbishment flat roof applications. Other popular products are: Recticel Powerdeck® F, Kingspan Thermaroof TR31, FR/TP Xtratherm Thin-R Thermal Ply, FR/BGM Xtratherm Thin-R and EcoTherm Eco Deck.

TYPES OF FLAT ROOF INSULATION

There are two methods of installing insulation in a flat roof: warm roof and cold roof insulation. Selecting which one is right for you will largely depend on what type of building you are working with.

WARM ROOF INSULATION (INSULATION ON TOP OF THE EXISTING ROOF)

Warm roof insulation works by putting the insulation material on top of the roof. It has been proven by German specialists that in order to improve the insulating properties of a flat roof, insulation must be fitted on the exterior site. By doing so the dew point is simply moved away from the roof. This insulation method stops the development of damp and decay by allowing moisture to escape, and as a result, it is thought to be the best option for the UK climate. It turns out that PIR (polyisocyanurate) boards are a most popular choice when it comes to warm roof insulation. They are highly durable and can handle being walked on. It is even more important if you consider the fact that roofs need to be able to withstand human weight. In fact, warm roof insulation is the most commonly used in domestic properties being cost effective. A warm deck roof can be very simple to install and offers higher thermal performance at the cost of a higher roof profile. Warm roof insulation ensures the entire roof structure is insulated, meaning a warm deck roof is more energy efficient than a cold roof. The insulation for a warm roof will usually be boards of extruded polystyrene or rigid compressed boards of glass fibre or rock fibre. These can be supplied with rebated edges which interlock reducing the risk of uplift.

COLD ROOF INSULATION (INSULATION BETWEEN JOISTS BELOW ROOF)

Cold roof insulation is an opposite method to warm roof insulation. In this technique, insulation is laid between the rafters below the roof level and the roof rafters are uninsulated from top, meaning on a winter's day the cold will conduct through the rafters and into the room below. Insulating an existing cold flat roof requires ripping up any existing roof surface to enable you to lay the insulation in between.

FLAT ROOF INSULATION GRANTS

You can qualify for flat roof insulation grants through the government’s ECO4 scheme. It is the government’s fourth and likely final phase of the scheme to help qualifying households receive funding for the installation of more energy efficient home improvements such as insulation. It is due to come into effect later on in 2022, replacing the recently ended ECO3. One of the main aims of the ECO scheme is to help the government lower carbon emissions in domestic homes across the UK in order to achieve its legally binding goal of reaching net-zero emissions by 2050. ECO4 is expected to run from late summer 2022 to 2026. If a member of a household is claiming an income-related benefit and the combined annual income of the household is less than £31,000, they could be eligible for free insulation grants through ECO4. In homes that have an existing EPC band of F or G, the grants will need to improve the rating to at least band D. Whereas if a home has an existing band of D or E, the funding grants are required to improve the rating to a minimum of band C.

FLAT ROOF INSULATION COST

The cost of insulating a roof will depend on 2 factors. First is the size of your property roof, second is the thickness. As of 2022 the average cost of installing a cold roof with 170mm fibreglass insulation is around £4.64 per m2, while with a warm roof it is £73.27 (174mm Xtratherm Plydeck PIR with OSB). Please note that this is an average cost and not the actual cost. Once you have determined what kind of roof you have, you can choose what type of roof insulation material you would like to use. Here is the handy guide based on 100mm insulation:

WARM ROOF

Xtratherm Plydeck PIR with OSB - £48.02 per m2
PLY FR/TP Xtratherm Thin-R - £42.25 per m2
FR/BGM Xtratherm Thin-R PIR  - £32.58 per m2
FR/MG Thin-R Xtratherm - £31.96 per m2
Kingspan Thermaroof TR31 - £58.60 per m2
Celotex Insulation TD4000 PIR Plywood - £45.25 per m2
Recticel Plylok PIR -  £52.89 per m2

COLD ROOF

Knauf Earthwool Loft Insulation Roll 44 Combi Cut - £2.30 per m2
URSA 10 Diverso Loft Insulation Roll - £2.76 per m2
Foil Faced RS45 Rocksilk Knauf - £21.48 per m2
Rocksilk RS45 Knauf Insulation Building Slab - £11.46 per m2
RWA45 Rockwool Acoustic Insulation Slab - £10.51 per m2
EPS70 Floor Polystyrene Insulation Jablite Jabfloor - £10.25 per m2
Celotex GA4000 PIR Insulation Board - £18.55 per m2

FLAT ROOF INSULATION RETROFIT

It is important to design the roof in collaboration with the manufacturers of the construction components to ensure compatibility, correct sizing and fixing to avoid premature failure of the roofing system. Adding insulation to an existing flat roof generally requires the removal and replacement of some of the existing structure. Depending on the condition of the existing roof, various retrofit options are available, including:

RENEWAL
It is appropriate where the existing deck and roofing system has failed. The deck and waterproof membrane is stripped and replaced new decking and roofing system.

OVERLAY
It is appropriate where the existing deck is sound and where the waterproof membrane is aged. Either a new membrane is placed over the existing complete with insulation and ballast (inverted warm) or the existing membrane is prepared as a vapour check and insulation is added complete with a waterproof membrane over (warm). Your roof can be insulated by installing several layers of rigid foam on top of the roof sheathing.

 

FLAT ROOF INSULATION BUILDING REGULATIONS

Whether your new flat roof is to be made of timber, concrete or felt you need to comply with flat roof building regulations. You will have to obtain a planning permission if you are making any structural changes to the roof. If the new roof covering is going to be different than the old one and this will affect the roof in the event of a fire and if you are replacing more than 25% of the roofing area, then you will also need to replace the thermal insulation. According to current Building Regulations to comply with Part L of the Building Regulations 2010, all roofs to rooms should be thermally insulated to a maximum U-value of 0.18 W/m²K. A lower U-value indicates better insulation properties, hence U-value requirements usually specify a maximum value. 

CONSTRUCTION ROOFING MATERIALS

You need to make sure that the roofing materials are the correct size so that the roof can support an average man’s weight. The insulation material for a warm flat roof should be able to cope with extremes of temperature and UV light without deterioration in thermal performance, be able to resist pressure from any anticipated foot traffic, be durable and suitable for external use and be capable of withstanding loads imposed on it during construction and future maintenance. An inverted warm roof must also be capable of receiving the extra load of the ballast.

GUTTERING

Under Part H of the Building Regulations, drainpipes and corresponding guttering must be fitted on at least two sides of the flat roof to ensure the flowing water doesn’t accumulate at the base of yours and neighbouring buildings. Water should drain to one or two edges. Waterproofing should extend up the adjacent walls at least 150mm from the roof surface. Depending on where you live in the UK, snowfall must also sometimes be considered in determining the gradient of the fall.

JOISTS

Flat roofs must be designed and built to be strong, durable and wind resistant.

WATERPROOFING
 
Warm roofs must have a VCL bonded to the deck. This can be made of polyethylene membrane, bitumen sheet, polymeric foil. Waterproofing should extend up the adjacent walls at least 150mm from the roof surface. Cold roofs must have ventilation.

If you decided to replace and insulate your roof, you will need to contact your Local Authority to issue firstly an Open Building Notice, that allows you to get started with your roofing projec and secondly a Certificate of Compliance on completion of the project, to prove to potential buyers that your flat roof meets all construction and energy efficiency guidelines.

 

Related articles:

Best loft roll insulation

How to choose the right Kingspan insulation board for construction?

Spray foam insulation – is it really that good?

7 easy tips for installing foil faced insulation the right way

2 Insulated plydeck compared

Cheaper alternative/equivalent to Kingspan insulation

 

 

Video credit:https://www.youtube.com/watch?v=RKssKIHs-io&t=14s
 

Brand: Various Model: 135mm Helical
135mm Helical Flat Roof Nail Warm Roof Fixing is a high performance, self-tapping, zinc plated nail designed for a quick installation and securing structural 6mm Plywood or 9mm OSB composite insulation panels. Helical Warm Roof Nails are a quick and reliable fixing method for energy efficient war..
  • Diameter: 8mm
  • Improved thermal bridging
  • Minimal compression of insulation
  • approx. 15-20 fixings per 1200x2400mm board
  • Suitable: from 49mm to 95mm Insulation Panels
£ 43.18
Ex Tax:£ 35.98
Estimated delivery: 2-3 working days
Brand: Xtratherm® Model: 21mm FR/TP
21mm Xtratherm FR/TP Thin-R Thermal Ply Composite Board for Flat Roof is an insulated panel consist of PIR (polyisocyanurate) core with a composite foil facings, bonded to 6mm WBP grade plywood designed for new and refurbishment flat roofs. FR/TP PIR and Plywood For Flat Roof is a three-in-one so..
  • Insulation & Decking in one Fix
  • Vapour Control Layer build in
  • For New & Refurbishment Roofs
  • Rapid Weather Proofing
  • PlyDeck FR/TP Square Edge
£ 79.79
Ex Tax:£ 66.49
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 21mm Unilin FR/TP
21mm Unilin FR/TP Warm Roof Insulation Decking is an insulated panel made of 15mm PIR rigid foam insulation core bonded to 6mm WBP grade plywood used for new and refurbishment flat roof applications. Unilin FR/TP Thermal Ply Flat Roof Insulation Board is faced to the under side with a gas-tight f..
  • 21mm Unilin FR/TP Warm Roof Insulation Board Decking
  • Used for new and refurbishment flat roof applications
  • Creates a continuous Vapour Control Layer (Vapour Barrier)
  • PIR foam insulation core and 6mm plywood insulated decking
  • Unilin FR/TP Thermal ply flat roof insulation over joists
£ 77.88
Ex Tax:£ 64.90
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 24mm OSB
24mm Plydeck Xtratherm (PIR with OSB Board) Flat Roof Insulation Decking is a three-in-one solution designed to provide decking, vapour control layer and high levels of thermal insulation in one easy applicable flat roof product. Xtratherm Plydeck is a composite board of enhanced PIR (polyisocyan..
  • Insulation & decking in one fix
  • For new & refurbishment roofs
  • Rapid weather proofing
  • R-Value: 0.69m2K/W
  • Thermal Conductivity: 0.022 W/mk
£ 80.53
Ex Tax:£ 67.11
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 25mm FR/ALU
25mm Xtratherm FR/ALU Flat Roof PIR Insulation Board Thin-R is a top-class polyisocyanurate foam core insulation board with vapour resistant gas-tight foil facers suitable for loose laid ballasted and mechanically fixed single ply waterproofing systems. Thin-R FR/ALU is a thermally efficient roof..
  • BBA Certification No. 11/4817
  • Vapour resistant foil facers
  • Loose laid ballasted systems
  • Thermal Conductivity: 0.022W/mK
  • Compatible with mechanically fixed single ply systems
£ 705.38
Ex Tax:£ 587.82
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 25mm FR/BGM
25mm Xtratherm Thin-R FR/BGM Flat Roof Insulation Board is a high-quality polyisocyanurate core (PIR) rigid insulation board with bitumen glass fibre and mineral glass facings designed for partially bonded, torched-on and built-up bituminous felt systems. Thin-R Xtratherm FR/BGM 25mm x 600mm x 12..
  • BBA Certification No. 11/4878.
  • Built-up Bituminous Felt Systems
  • Insulation for Torched-on Systems
  • Insulation for Partially Bonded Systems
  • Mechanically Fastened or Loose Laid Ballasted Bituminous Systems
£ 283.70
Ex Tax:£ 236.42
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 25mm FR/MG
25mm Xtratherm Thin-R FR/MG Flat Roof Insulation is a high-quality polyisocyanurate foam core (PIR) insulation board with mineral coated glass facers designed for use below single ply fully adhered roof membranes, single ply waterproofing systems and partially bonded built-up felt. Xtratherm Flat..
  • BBA Certification No. 11/4878.
  • Single Ply Fully Adhered Systems
  • Single Ply Waterproofing Systems
  • Partially Bonded Built-Up Felt Systems
  • Laid on Mechanically Fixed or Adhered Boards
£ 247.13
Ex Tax:£ 205.94
Estimated delivery: 3-5 working days
Brand: Kingspan® Model: 25mm TR26 Thermaroof
25mm Kingspan Thermaroof TR26 LPC/FM is a high performance PIR insulation board for flat roofs, fully compatible with most mechanically fixed single-ply waterproofing systems and green roof systems. The Thermaroof® TR26 LPC/FM Boards are manufactured with Nilflam® technology, a high performance r..
  • 25mm Kingspan TR26 Flat Roof PIR Rigid Insulation Board
  • TR26 Thermal Conductivity (lambda) as low as 0.022W/mK
  • Compatible with mechanically fixed single-ply waterproofing
  • High performance PIR Rigid Insulation board for flat roofs
  • Fully compatible with green roof systems (2400mm x 1200mm)
£ 459.16
Ex Tax:£ 382.63
Estimated delivery: 5-7 working days
Brand: Kingspan® Model: 25mm Thermaroof® TR27
25mm Kingspan Thermaroof TR27 is a flat roof insulation board used on roofs waterproofed with fully-adhered, single-ply, partially-bonded, built-up felt, mastic asphalt or cold liquid applied waterproofing. Kingspan TR27 is manufactured to the highest standards offering a thermal conductivity of ..
  • 25mm Kingspan Thermaroof TR27 Flat Roof Insulation Board
  • Thermal conductivity of 0.027 W/mK for board thickness < 80 mm
  • PIR rigid insulation core faced on both sides with a coated glass tissue
  • Kingspan Thermaroof® TR27 LPC/FM is covered by BBA Certificate 16/5332
  • Fully-adhered, single-ply, partially-bonded, built-up felt, mastic asphalt or cold liquid applied waterproofing
£ 110.56
Ex Tax:£ 92.13
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: 25mm SR/PR
25mm Xtratherm Safe-R SR/PR Pitched Roof Insulation Board is a high-class rigid phenolic foam insulation board with a low emissivity foil facings designed for pitched roofs, sloped roofs, ventilated roofs, hybrid roofs and warm roofs. Xtratherm SR/PR range is a BBA certified high-efficiency therm..
  • BBA Certification No. 10/4803
  • Thermal Conductivity: 0.021W/mK
  • Reaction to Fire Euroclass B-s1, d0
  • Reduced Thermal Bridging and Risk of Condensation
  • Lightweight and Easy to Install - Superior Performance Phenolic Insulation
£ 582.35
Ex Tax:£ 485.29
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 25mm Unilin FR/ALU
25mm Unilin FR/ALU Thin-R Flat Roof Insulation Board comprising a rigid polyisocyanurate (PIR) insulation board with a composite gas-tight foil facings on both sides. Flat Roof Board FR/ALU is used as a thermal insulation and to create or improve falls on limited access concrete, timber or metal ..
  • 25mm Unilin FR/ALU Thin-R Flat Roof PIR Insulation Board
  • Rigid PIR Insulation Board with a gas-tight foil facings on both sides
  • Used as a thermal insulation on timber or metal flat roof decks
  • High Performance Board used in conjunction with a vapour control layer
  • Used with a single-ply mechanically fixed roof waterproofing membrane
£ 637.62
Ex Tax:£ 531.35
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 25mm Unilin FR/BGM
The 25mm Unilin Thin-R FR/BGM Flat Roof Insulation Board is faced with a polypropylene fleece finished bitumen glass-fibre working surface and a mineral glass facing to the underside. FR/BGM boards are suitable for use with most bitumen based, partially bonded waterproofing systems typically incl..
  • Unilin FR/BGM Flat Roof Insulation Board 25mm x 600mm x 1200mm
  • Faced with a polypropylene fleece finished bitumen glass-fibre working surface
  • Faced with a mineral glass facing to the underside insulation board surface
  • Used for partially bonded torched-on built-up bituminous felt systems
  • Can be used as a cheaper alternative to Celotex and Kingspan TR24 Insulation
£ 205.13
Ex Tax:£ 170.94
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 25mm Unilin FR/MG
25mm Unilin Flat Roof FR/MG is a high performance Polyisocyanurate with mineral coated glass facers suitable for use below single ply waterproofing systems and partially bonded built-up felt. FR/MG Insulation Board for use as a thermal insulation layer and to create or improve falls on limited ac..
  • 25mm x 600mm x 1200mm Unilin FR/MG Flat Roof Insulation Board
  • High Performance PIR Insulation Board with mineral coated glass facers
  • For concrete, timber or metal flat roof decks in domestic and non-domestic buildings
  • Used below single ply waterproofing systems and partially bonded built-up felt
  • Can be used as a cheaper alternative to Celotex and Kingspan Therma Roof Insulation
£ 155.88
Ex Tax:£ 129.90
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 25mm Unilin XtroDeck XO/XD
25mm XtroDeck XO/XD Unilin is faced with an embossed aluminum facing on both sides high performance flat roof board used for partially bonded, self adhered built-up bituminous felt roof systems. Flat Roof Insulation XO/XD is manufactured to EN 13165 by Unilin Insulation with a declared lambda (th..
  • 25mm Unilin Xtroliner XtroDeck XO/XD Flat Roof PIR Insulation Board
  • Premium Rigid PIR Insulation Board with an embossed aluminum facings
  • Used for partially bonded, self adhered built-up bituminous felt roof systems
  • Lambda (thermal conductivity) of 0.021 W/mK and Euroclass C s2 d0 fire classification
  • Unilin XtroDeck XO/XD flat roof insulation board may also be fully bonded
£ 635.88
Ex Tax:£ 529.90
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: 25mm XO/PR Roof
25mm XO/PR Pitched Roof PIR Insulation Board Xtratherm Xtroliner is an improved performance polyisocyanurate rigid foam roof insulation board with robust textured foil facings designed for pitched roofs, sloped roofs, ventilated roofs, hybrid roofs and warm roofs. Xtratherm Xtroliner XO/PR 25mm i..
  • Reduced Risk of Condensation
  • High Compressive Strength >150 (kPa)
  • Premium PIR Insulation - Thermal Conductivity: 0.021W/mK
  • Fire: Euroclass C-s2, d0 - BBA Certificate 12/4956
  • Reduces Intrusion into Living Area - Robust Foil Facings
£ 958.12
Ex Tax:£ 798.43
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 30-50mm Unilin TR/BGM
30-50mm Unilin TR/BGM (Torch-on) is a high performance PIR tapered roof insulation with a polypropylene fleece finished bitumen/glass fibre working surface and a mineral glass facing to the underside. Unilin TR/BGM boards are not reversible, they are suitable for use below most bitumen based part..
  • 30-50mm Unilin TR/BGM Tapered Roof Insulation Board (1200x1200mm)
  • Faced with a polypropylene fleece finished bitumen/glass fibre working surface
  • Composite bitumen/glassfibre facing on the reverse side (not reversible)
  • Concrete, timber or metal flat roof decks in domestic and non-domestic buildings
  • High performance tapered roof PIR rigid foam insulation board
£ 273.16
Ex Tax:£ 227.63
Estimated delivery: 7-10 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 30-50mm Unilin TR/MG
30-50mm Unilin Tapered Roof TR/MG is a high performance PIR with mineral coated glass facers used below single ply fully adhered roof membranes, waterproofing systems and partially bonded built-up felt. Unilin TR/MG tapered roof insulation boards are embedded in a layer of bitumen on a 3G type fe..
  • 30-50mm Unilin TR/MG Tapered Roof Insulation Board (1200x1200mm)
  • High Performance PIR insulation board with mineral coated glass facers
  • TR/MG can be used below single ply fully adhered roof membranes
  • Can be used in waterproofing systems and partially bonded built-up felt
  • Practical solution to water ponding with insulation and drainage in a single system
£ 294.35
Ex Tax:£ 245.29
Estimated delivery: 7-10 working days
Brand: Sundolitt Model: 30mm XPS300 Sundolitt
30mm Sundolitt® XPS300 (300kPa) Insulation Board is a highly-durable rigid thermal insulation board made of extruded polystyrene used in high moisture environments such as inverted roofs, flat or zero pitch roofs and green roofs systems. XPS 300 Sundolitt is a lightweight, easy to cut extruded po..
  • 30mm Sundolitt XPS300 Extruded Polystyrene Board
  • XPS Insulation Sheets highly-durable rigid thermal insulation boards
  • High moisture environments | Installed in severe wet weather conditions
  • Lightweight, easy to cut extruded polystyrene insulation 300kPa
  • Great Thermal performance and versatility able to withstand extreme loads
£ 142.14
Ex Tax:£ 118.45
Estimated delivery: 5-7 working days
Brand: Soprema Model: 30mm XPS 300
30mm Soprema XPS 300 SL is a high quality, waterproof and strong rigid extruded polystyrene insulation board used as a durable thermal solution to technically demanding applications where high compressive loading (300kPa) is a requirement. XPS SL 300 1250mm x 600mm x 30mm is designed for use in c..
  • Extruded Foam Polystyrene XPS
  • Pack coverage: 10.5m2
  • Board coverage: 0.75m2
  • Thermal Conductivity: 0.034 W/mk
  • R-Value: 0.9m2K/W
£ 126.88
Ex Tax:£ 105.73
Estimated delivery: 3-5 working days
Brand: BASF Model: 30mm Styrodur XPS
30mm BASF Styrodur® 3000 CS XPS Insulation Board is an innovative multipurpose thermal insulation board made of extruded polystyrene with smooth surfaces and shiplap edges for almost all applications in structural and civil engineering. Styrodur® 3000 CS XPS comes in 1265mm long by 615mm wide she..
  • 30mm Styrodur® 3000 CS XPS (extruded polystyrene) Insulation
  • Innovative multipurpose thermal foam rigid insulation board
  • Smooth surfaces and shiplap edges for almost all applications
  • Styrodur high-compressive and mechanical strength of 300kPa
  • 1265mm long by 615mm wide Extruded Polystyrene XPS Sheets
£ 155.08
Ex Tax:£ 129.23
Estimated delivery: 7-10 working days
Brand: Xtratherm® Model: 30mm Xtratherm XPS 300
30mm Xtratherm XPS 300 is a high performance rigid extruded polystyrene insulation board providing a durable thermal solution to technically demanding applications where high compressive loading of 300kPa is a requirement. Extruded Polystyrene XPS 300 is an ideal solution for use in commercial, i..
  • 30mm Extruded Polystyrene Xtratherm XPS 300 kPa
  • For use in commercial, industrial and cold storage areas
  • Closed-cell structure, which prevents moisture-absorption
  • Very low lambda values and compressive loading capabilities
  • Xtratherm XPS Sheets are 1250mm long by 600mm wide boards
£ 135.67
Ex Tax:£ 113.06
Estimated delivery: 2-3 working days
Brand: Danosa Model: 40mm Danopren TR40
40mm Danopren XPS TR40 (Styrofoam) Insulation is a closed-cell extruded polystyrene foam board, commonly called 'Blue Board', manufactured as foam thermal insulation sheets used as an insulation in walls, roofs, foundations and as a water barrier. XPS Insulation Danopren is an easy and safe to ha..
  • 40mm Danopren XPS TR40 (Styrofoam) Rigid Insulation Board
  • Closed-cell XPS (extruded polystyrene) foam insulation sheets
  • Commonly called 'Blue Board' high-compressive strength (300kPa)
  • BBA Certified 19/5704 Manufactured without CFC's, HCFC's or HFC's
  • Flat and inverted roofs, floors, residential and commercial applications
£ 104.56
Ex Tax:£ 87.13
Estimated delivery: 3-5 working days
Brand: Kingspan® Model: 50mm TR24 Thermaroof
50mm Kingspan Thermaroof TR24 Flat Roof PIR Insulation Board is a high performance rigid insulation board for flat roofs, compatible with the majority of torch-applied waterproofing systems for both new build and refurbishment projects. The core of Kingspan Thermaroof® TR24 is manufactured with N..
  • 50mm Kingspan Thermaroof TR24 Flat Roof Insulation Board
  • 50mm TR24 Thermal Conductivity (lambda-value) of 0.027W/mK
  • Suitable for both new build and refurbishment projects
  • Compatible with the majority of torch-applied waterproofing systems
  • High Performance Rigid PIR Insulation Board for Flat Roofs
£ 92.20
Ex Tax:£ 76.83
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: T&G Warm Roof
50mm XO/SK Xtratherm Xtroliner Warm Pitched Roof Insulation is an improved performance PIR (polyisocyanurate) engineered tongue and grooved insulation board with robust textured foil facings designed for use in warm roof construction systems. Xtratherm Xtroliner XO/SK 50mm is a premium external r..
  • BRE Green Guide A+ rating
  • Thermal Conductivity: 0.021W/mK
  • Reaction to Fire: Euroclass C-s2, d0
  • Robust Tongue & Groove Jointing
  • BBA Certificate 12/4956
£ 0.00
Ex Tax:£ 0.00
Estimated delivery: Pre-Order
Brand: Kingspan® Model: 56mm TR31
56mm Kingspan Thermaroof TR31 Structural Plywood Insulation for Flat Roof Decking is a high-quality 50mm PIR insulation board bonded to 6mm FSC certified plywood on one side and multilayer foil on the reverse side.  Kingspan TR31 Composite Structural Flat Roof PIR Board is a 3 in 1 solution desig..
  • Vapour control layer
  • Pack Coverage: 57.60m2
  • Core Density: 32kg/m3
  • Compressive Strength: 150kPa
  • Thermal Conductivity: 0.022W/mK
£ 0.00
Ex Tax:£ 0.00
Estimated delivery: Out Of Stock
Brand: Celotex® Model: 96mm TD4000
96mm Celotex TD4000 (TD4096) PIR Insulated Plywood Flat Roof Board is a 3 in 1 product designed to provide decking, vapour control layer and insulation for new and refurbishment flat roof applications. Celotex TD4000 provides a quick and easy way to achieve effective thermally insulated flat roof..
  • Vapour Control Layer
  • 5.5mm WBP exterior grade plywood
  • Compressive strength: ≥120kPa
  • Water vapour resistance: >150MNs/g
  • Thermal Conductivity: 0.022W/mK
£ 0.00
Ex Tax:£ 0.00
Estimated delivery: Out Of Stock
Brand: EcoTherm® Model: 96mm Eco-Deck
96mm EcoTherm Eco-Deck Pre-Insulated Structural Flat Roof Decking is a solid high-quality PIR (polyisocyanurate) insulation board bonded to 6mm plywood on one side and multilayer foil on reverse side designed to deck and insulate in one simple application on new roofs or upgrading the thermal perfor..
  • Size: 1200mm x 2400mm
  • Board coverage: 2.88m2
  • Thermal Conductivity: 0.022 W/mk
  • R-Value: 4.15m2K/W
  • Commpressive Strength: >150 kPa
£ 0.00
Ex Tax:£ 0.00
Estimated delivery: Pre-Order
Brand: Recticel® Model: 96mm Plylok
96mm Recticel Plylok PIR Warm Flat Roof Insulation Board is a 3 in 1 solution to provide decking, vapour control layer and insulation in one application for use in warm flat roofs under traditional bituminous waterproofing and single-ply waterproofing membranes in new build and refurbishment flat ro..
  • Size: 1200mm x 2400mm
  • 96mm - pack of 14
  • Pack coverage: 40.32m2
  • Thermal Conductivity: 0.022 W/mk
  • Commpressive Strength: >140 kPa
£ 2,354.17
Ex Tax:£ 1,961.81
Estimated delivery: 7-14 working days
Brand: Soprema Model: 30mm XPS Single Board
30mm Soprema (EFYOS) XPS Insulation Board is a rigid, waterproof and strong extruded polystyrene insulation foam used as a durable thermal solution to technically demanding applications where high compressive loading (300kPa) is a requirement. XPS (Extruded Polystyrene) differs from EPS (Expanded..
  • 30mm Extruded Foam Polystyrene XPS Insulation Board
  • For use in commercial, industrial and cold storage areas
  • Durable thermal solution · Compressive strength of 300kPa
  • Floors · Construction · Basements · Car parks · Below-ground works
  • Swimming pools · Flat and pitched roofs · Inverted and green roofs
£ 12.80
Ex Tax:£ 10.67
Estimated delivery: 2-3 working days
Brand: Celotex® Model: 106mm TD4000
106mm Celotex TD4000 (TD4096) PIR Insulated Plywood Flat Roof Board is a 3 in 1 product designed to provide decking, vapour control layer and insulation for new and refurbishment flat roof applications. Celotex TD4000 2400mm x 1200mm provides a quick and easy way to achieve effective thermally in..
  • Vapour Control Layer
  • 5.5mm WBP exterior grade plywood
  • Compressive strength: ≥120kPa
  • Water vapour resistance: >150MNs/g
  • Thermal Conductivity: 0.022W/mK
£ 0.00
Ex Tax:£ 0.00
Estimated delivery: Out Of Stock
Brand: EcoTherm® Model: 106mm Eco-Deck
106mm EcoTherm Eco-Deck Pre-Insulated Structural Flat Roof Decking is a solid high-quality PIR (polyisocyanurate) insulation board bonded to 6mm plywood on one side and multilayer foil on reverse side designed to deck and insulate in one simple application on new roofs or upgrading the thermal perfo..
  • Size: 1200mm x 2400mm
  • Board coverage: 2.88m2
  • Thermal Conductivity: 0.022 W/mk
  • R-Value: 4.60m2K/W
  • Commpressive Strength: >150 kPa
£ 0.00
Ex Tax:£ 0.00
Estimated delivery: Pre-Order
Brand: Recticel® Model: 116mm Plylok
116mm Recticel Plylok PIR Warm Flat Roof Insulation Board is a 3 in 1 solution to provide decking, vapour control layer and insulation in one application for use in warm flat roofs under traditional bituminous waterproofing and single-ply waterproofing membranes in new build and refurbishment flat r..
  • Size: 1200mm x 2400mm
  • 116mm - pack of 11
  • Pack coverage: 31.68m2
  • Thermal Conductivity: 0.022 W/mk
  • Commpressive Strength: >140 kPa
£ 2,167.36
Ex Tax:£ 1,806.13
Estimated delivery: 7-14 working days
Brand: Various Model: 165mm Helical
165mm Helical Flat Roof Nail Warm Roof Fixing is a high performance, self-tapping, zinc plated nail designed for a quick installation and securing structural 6mm Plywood or 9mm OSB composite insulation panels. Helical Warm Roof Nails are a quick and reliable fixing method for energy efficient war..
  • Diameter: 8mm
  • Improved thermal bridging
  • Minimal compression of insulation
  • approx. 15-20 fixings per 1200x2400mm board
  • Suitable: from 96mm to 129mm Insulation Panels
£ 45.46
Ex Tax:£ 37.88
Estimated delivery: 2-3 working days
Brand: Xtratherm® Model: 26mm FR/TP
26mm Xtratherm FR/TP Thin-R Thermal Ply Composite Board for Flat Roof is an insulated panel consist of PIR (polyisocyanurate) core with a composite foil facings, bonded to 6mm WBP grade plywood designed for new and refurbishment flat roofs. FR/TP PIR and Plywood For Flat Roof is a three-in-one so..
  • Insulation & Decking in one Fix
  • Vapour Control Layer build in
  • For New & Refurbishment Roofs
  • Rapid Weather Proofing
  • PlyDeck FR/TP Square Edge
£ 86.14
Ex Tax:£ 71.78
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 26mm Unilin FR/TP
26mm Unilin FR/TP Flat Roof Insulation Decking is a high performance insulated panel made of 20mm Unilin PIR insulation bonded to 6mm plywood used for new and refurbishment flat roof applications. Unilin FR/TP Thermal Ply Flat Roof Insulation Board is faced to the under side with a gas-tight foil..
  • 26mm Unilin FR/TP Warm Roof PIR Ply Insulation Board Decking
  • Used for new build and refurbishment flat roof applications
  • Creates a continuous Vapour Control Layer (Vapour Barrier)
  • PIR foam insulation core and 6mm plywood insulated decking
  • Unilin FR/TP Thermal ply flat roof insulation over joists board
£ 81.00
Ex Tax:£ 67.50
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 29mm OSB
29mm Plydeck Xtratherm (PIR with OSB Board) Flat Roof Insulation Decking is a three-in-one solution designed to provide decking, vapour control layer and high levels of thermal insulation in one easy applicable flat roof product. Xtratherm Plydeck is a composite board of enhanced PIR (polyisocyan..
  • Insulation and Decking in one Fix
  • Rapid Weather Proofing - OSB Deck
  • For New Build and Refurbishment Roofs
  • R-Value: 0.92m2K/W
  • Thermal Conductivity: 0.022 W/mk
£ 88.13
Ex Tax:£ 73.44
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 30mm FR/BGM
30mm Xtratherm FR/BGM Thin-R Flat Roof Insulation Board is a high-quality polyisocyanurate core (PIR) insulation board with bitumen glass fibre and mineral glass facing designed for partially bonded, torched-on and built-up bituminous felt systems. Xtratherm Flat Roof Thin-R board can also be use..
  • BBA Certification No. 11/4878.
  • Built-up Bituminous Felt Systems
  • Insulation for Torched-on Systems
  • Insulation for Partially Bonded Systems
  • Mechanically Fastened or Loose Laid Ballasted Bituminous Systems
£ 263.76
Ex Tax:£ 219.80
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 30mm FR/MG
30mm Xtratherm Thin-R FR/MG Flat Roof Insulation is a high-quality polyisocyanurate foam core (PIR) insulation board with mineral coated glass facers designed for use below single ply fully adhered roof membranes, single ply waterproofing systems and partially bonded built-up felt. Xtratherm Flat..
  • BBA Certification No. 11/4878.
  • Single Ply Fully Adhered Systems
  • Single Ply Waterproofing Systems
  • Partially Bonded Built-Up Felt Systems
  • Laid on Mechanically Fixed or Adhered Boards
£ 225.84
Ex Tax:£ 188.20
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 30mm Unilin FR/BGM
30mm FR/BGM Unilin Thin-R Flat Roof Insulation Board is a PIR (polyisocyanurate) rigid foam thermal insulation board used for partially bonded torched-on built-up bituminous felt systems. FR/BGM boards are suitable for use with most bitumen based, partially bonded waterproofing systems typically ..
  • Unilin FR/BGM Flat Roof Insulation Board 30mm x 600mm x 1200mm
  • Faced with a polypropylene fleece finished bitumen glass-fibre working surface
  • Faced with a mineral glass facing to the underside insulation board surface
  • Used for partially bonded torched-on built-up bituminous felt systems
  • Can be used as a cheaper alternative to Celotex and Kingspan TR24 Insulation
£ 182.94
Ex Tax:£ 152.45
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 30mm Unilin FR/MG
30mm Unilin FR/MG comprises a rigid Polyisocyanurate (PIR) core between mineral glass facings suitable for use below single ply waterproofing systems and partially bonded built-up felt. FR/MG Insulation Board for use as a thermal insulation layer and to create or improve falls on limited access c..
  • 30mm x 600mm x 1200mm Unilin FR/MG Flat Roof Insulation Board
  • High Performance PIR Insulation Board with mineral coated glass facers
  • For concrete, timber or metal flat roof decks in domestic and non-domestic buildings
  • Used below single ply waterproofing systems and partially bonded built-up felt
  • Can be used as a cheaper alternative to Celotex and Kingspan Therma Roof Insulation
£ 139.48
Ex Tax:£ 116.23
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 30mm Unilin FR/ALU
30mm Unilin FR/ALU is a high performance PIR rigid foam insulation board with vapour barrier built in used for mechanically fixed single ply waterproofing systems. Flat Roof Board FR/ALU is used as a thermal insulation and to create or improve falls on limited access concrete, timber or metal fla..
  • 30mm Unilin FR/ALU Thin-R Flat Roof PIR Insulation Board
  • Rigid PIR Insulation Board with a gas-tight foil facings on both sides
  • Used as a thermal insulation on timber or metal flat roof decks
  • High Performance Board used in conjunction with a vapour control layer
  • Used with a single-ply mechanically fixed roof waterproofing membrane
£ 626.02
Ex Tax:£ 521.68
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: 30mm XO/PR Roof
30mm Xtratherm Xtroliner XO/PR Pitched Roof PIR Insulation Board is an improved performance polyisocyanurate rigid foam roof insulation board with robust textured foil facings designed for pitched roofs, sloped roofs, ventilated roofs, hybrid roofs and warm roofs. Xtroliner XO/PR Xtratherm 30mm ..
  • Reduced Risk of Condensation
  • High Compressive Strength >150 (kPa)
  • Premium PIR Insulation - Thermal Conductivity: 0.021W/mK
  • Fire: Euroclass C-s2, d0 - BBA Certificate 12/4956
  • Reduces Intrusion into Living Area - Robust Foil Facings
£ 853.93
Ex Tax:£ 711.61
Estimated delivery: 5-7 working days
Brand: BASF Model: 40mm Styrodur XPS
40mm XPS Styrodur 3000 CS is a rigid foam insulation board made of extruded polystyrene, an innovative multipurpose thermal insulation board with smooth surfaces and shiplap edges for almost all applications in structural and civil engineering. Styrodur® 3000 CS XPS 40mm comes in 1265mm long by 6..
  • 40mm Styrodur® 3000 CS XPS (extruded polystyrene) Insulation
  • Innovative multipurpose thermal foam rigid insulation board
  • Smooth surfaces and shiplap edges for almost all applications
  • Styrodur high-compressive and mechanical strength of 300kPa
  • 1265mm long by 615mm wide Extruded Polystyrene XPS Sheets
£ 148.61
Ex Tax:£ 123.84
Estimated delivery: 7-10 working days
Brand: Xtratherm® Model: 40mm FR/ALU
40mm Xtratherm FR/ALU Flat Roof PIR Insulation Board Thin-R is a top-class polyisocyanurate foam core insulation board with vapour resistant gas-tight foil facers suitable for loose laid ballasted and mechanically fixed single ply waterproofing systems. Xtratherm Thin-R FR/ALU 2400mm x 1200mm x 4..
  • BBA Certification No. 11/4817
  • Vapour resistant foil facers
  • Loose laid ballasted systems
  • Thermal Conductivity: 0.022W/mK
  • Compatible with mechanically fixed single ply systems
£ 509.63
Ex Tax:£ 424.69
Estimated delivery: 3-5 working days
Brand: Kingspan® Model: 40mm Thermaroof® TR27
40mm Kingspan Thermaroof TR27 Flat Roof Insulation Board is an easy to handle and install PIR insulation board compatible with most green roof systems. Kingspan TR27 is manufactured to the highest standards in accordance with current building requirements offering a thermal conductivity of 0.027 ..
  • 40mm Kingspan Thermaroof TR27 Flat Roof Insulation Board
  • Thermal conductivity of 0.027 W/mK for board thickness < 80 mm
  • PIR rigid insulation core faced on both sides with a coated glass tissue
  • Kingspan Thermaroof® TR27 LPC/FM is covered by BBA Certificate 16/5332
  • Fully-adhered, single-ply, partially-bonded, built-up felt, mastic asphalt or cold liquid applied waterproofing
£ 105.02
Ex Tax:£ 87.52
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: 40mm SR/PR
40mm Xtratherm Safe-R SR/PR Pitched Roof Insulation Board is a high-class rigid phenolic foam insulation board with a low emissivity foil facings designed for pitched roofs, sloped roofs, ventilated roofs, hybrid roofs and warm roofs. Xtratherm SR/PR range is a BBA certified high-efficiency therm..
  • BBA Certification No. 10/4803
  • Thermal Conductivity: 0.021W/mK
  • Reaction to Fire Euroclass B-s1, d0
  • Reduced Thermal Bridging and Risk of Condensation
  • Lightweight and Easy to Install - Superior Performance Phenolic Insulation
£ 465.70
Ex Tax:£ 388.08
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: 40mm Xtratherm XPS 300
40mm Extruded Polystyrene Xtratherm XPS is a rigid foam extruded polystyrene insulation board providing a durable thermal solution to technically demanding applications where high compressive loading of 300kPa is a requirement. Extruded Polystyrene XPS 300 is an ideal solution for use in commerci..
  • 40mm Extruded Polystyrene Xtratherm XPS 300 kPa
  • For use in commercial, industrial and cold storage areas
  • Closed-cell structure, which prevents moisture-absorption
  • Very low lambda values and compressive loading capabilities
  • Xtratherm XPS Sheets are 1250mm long by 600mm wide boards
£ 148.09
Ex Tax:£ 123.41
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 50-70mm Unilin TR/BGM
50-70mm Unilin TR/BGM Torch-on Tapered Insulation, a rigid foam polyisocyanurate board with a mineral-coated glass fibre facing on one side and a composite bitumen/glassfibre facing on the other. Unilin TR/BGM boards are not reversible, they are suitable for use below most bitumen based partially..
  • 50-70mm Unilin TR/BGM Tapered Roof Insulation Board (1200x1200mm)
  • Faced with a polypropylene fleece finished bitumen/glass fibre working surface
  • Composite bitumen/glassfibre facing on the reverse side (not reversible)
  • Concrete, timber or metal flat roof decks in domestic and non-domestic buildings
  • High performance tapered roof PIR rigid foam insulation board
£ 231.11
Ex Tax:£ 192.59
Estimated delivery: 7-10 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 50-70mm Unilin TR/MG
50-70mm TR/MG Unilin Roof Board, comprising a rigid PIR foam core between mineral glass facings used below single ply fully adhered roof membranes, waterproofing systems and partially bonded built-up felt. Unilin TR/MG tapered roof insulation boards are embedded in a layer of bitumen on a 3G type..
  • 50-70mm Unilin TR/MG Tapered Roof Insulation Board (1200x1200mm)
  • High Performance PIR insulation board with mineral coated glass facers
  • TR/MG can be used below single ply fully adhered roof membranes
  • Can be used in waterproofing systems and partially bonded built-up felt
  • Practical solution to water ponding with insulation and drainage in a single system
£ 245.29
Ex Tax:£ 204.41
Estimated delivery: 7-10 working days
Brand: Kingspan® Model: 50mm TR26 Thermaroof
50mm Kingspan Therma TR26 is a PIR flat roof insulation board fully compatible with most mechanically fixed single-ply waterproofing systems and green roof systems. The Thermaroof® TR26 LPC/FM boards are manufactured with Nilflam® technology, a high performance rigid thermoset polyisocyanurate (P..
  • 50mm Kingspan TR26 Flat Roof PIR Rigid Insulation Board
  • TR26 Thermal Conductivity (lambda) as low as 0.022W/mK
  • Compatible with mechanically fixed single-ply waterproofing
  • High performance PIR Rigid Insulation board for flat roofs
  • Fully compatible with green roof systems (2400mm x 1200mm)
£ 354.02
Ex Tax:£ 295.02
Estimated delivery: 5-7 working days
Brand: Soprema Model: 50mm XPS 300
50mm Soprema XPS 300 Insulation Board is a strong rigid extruded polystyrene (XPS) foam insulation board used as a durable thermal solution to technically demanding applications where high compressive loading of 300kPa is a requirement. XPS300 Soprema 50mm x 600mm x 1250mm is designed for use in ..
  • Extruded Foam Polystyrene XPS
  • Pack covaerage: 6.00m2
  • Board covarage: 0.75m2
  • Thermal Conductivity: 0.034 W/mk
  • R-Value: 1.5m2K/W