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34mm Xtratherm Plydeck PIR with OSB Flat Roof Insulation

34mm OSB Insulation Deck Flat Roof - 25mm Xtratherm PIR Rigid Insulation bonded to 9mm OSB Board - PlyDeck
34mm Xtratherm Plydeck PIR with OSB Flat Roof Insulation
  • Insulation and Decking in one Fix
  • Rapid Weather Proofing - OSB Deck
  • For New Build and Refurbishment Roofs
  • R-Value: 1.15m2K/W
  • Thermal Conductivity: 0.022 W/mk
Estimated delivery:
In Stock
£ 85.72
Ex VAT: £ 71.43
  • Brand: Xtratherm®
  • Model: 34mm OSB
  • Weight: 21.97kg
  • Dimensions: 2,400mm x 1,200mm x 34mm
  • SKU: 34mm
  • Product code: P1-232
  • MPN: 34mm-Ply-Deck

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This product has a minimum quantity of 14

34mm 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 (polyisocyanurate) core faced with foil on one side and 9mm OSB board on the other side which is very useful when applying hot bitumen on a flat roof without damaging the insulation.

Wide range of thicknesses available: 24mm, 29mm, 34mm, 39mm, 44mm, 49mm, 54mm, 59mm, 69mm, 74mm, 79mm, 84mm, 89mm, 99mm, 109mm, 119mm, 129mm, 139mm, 149mm, 159mm, 174mm.

High-efficiency polyisocyanurate (polyiso) foam insulation core is a commonly used material in the construction industry, produced as a foam and used as rigid thermal insulation.

The insulation core and composite foil facings resist attack by mould, fungi, bacteria and microbial growth.

The roof construction is a critical element in the building fabric and is an area at high risk of heat loss. 

Using Xtratherm Plydeck Thin-R will reduce heat loss while also delivering excellent thermal bridging details.




Thickness: 34mm overall

Size: 1200mm x 2400mm

Board coverage: 2.88m2

Density (Foam Core): 32 Kg/m3

Weight: approx. 21.97kg

Thermal Conductivity: 0.022 W/mk

R-Value: 1.15m2K/W

Compressive Strength: >150 kPa

Water Vapour Resistivity: >100 MNs/gm


Key Points

· Insulation & decking in one fix

· For new & refurbishment roofs

· Rapid weather proofing

· Easy to Install


OSB Insulation Deck Flat Roof Insulation

All edges should be supported - add noggings where necessary. Stagger fixings where boards are butted.

Boards should be embedded in vapour resistant mastic to provide a vapour control layer in conjunction with foil facing.

Mastic should be laid wide enough to facilitate 2 panel edges and be continuous around all edges. 

OSB Insulation Deck should be staggered and butted.

Each edge should have a minimum bearing of 20mm on joist.


*Thermal conductivity is dependent on facings and product thickness.

*Special Product - Non returnable cancelable.

Board covarage 2.88 m2
Compressive Strength 150 kPa
Density 32 Kg/m3
Length 2400mm
Material Polyisocyanurate PIR ǀ OSB
R-Value 1.15m2K/W
Size 1200mm x 2400mm
Thickness 34mm overall
Water Vapour Resistivity 100 MNs/gm
Weight approx. 24.3kg
Width 1200mm
Vapour Resistivity 100 MNs/gm
Finish Aluminium foil face ǀ OSB reverse face
Shipping method Articulated Vehicle ǀ Courier
Applications Flat Roof ǀ Hot Bitumen ǀ Decking
ETA Notification Yes
Features Highly-durable three-in-one solution
Manufacturer Xtratherm®

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We deliver insulation materials to Mainland UK only. Deliveries to Highlands, Northern Ireland, Isle of Wight etc.. might be possible at additional cost.
We offer free delivery on most of the orders above £300 (excluding VAT) (except special products - shipping cost via courier - products marked ''Request A Quote'')

Delivery of some insulation materials might be extended due to the current situation (Covid-19, stock shortages, allocations).
If you need materials quickly please contact us - we will do our best to help you source materials needed.

We do not deliver on weekends and bank holidays. Sometimes we can deliver on Saturdays - please check with us before placing the order.
If you need any further information please contact us tel. 02081910776

We can help to calculate price per m2 or linear meter (one meter in length) cost, please just contact us via phone 02081910776, email or live chat. Alternatively, you can work it out yourself quickly and easily: to get cost per meter square please divide price shown in orange area by ''Required area (m2)'' Example price of £28.80 divided by board coverage 2.88m2 = cost of £10.00 per m2.


No matter whether you choose a local installer or a national company, there’s a few tips to help you find the right installer for your home insulation improvements, such as asking for recommendations and making sure that they’re part of a certification scheme. This makes sure that they have the right skills and standards of workmanship to carry out the installation, and you can be sure that they know exactly what they are doing.


1. Thermal inspection picture in portfolio

It’s worth seeing a installer’s previous work. There’s no harm asking if you can see any properties nearby that they’ve installed insulation in. Best way would be to see Infrared Thermal Imaging Inspections. Thermal cameras spot small, but key changes in temperature in different areas of a house, identifying problematic areas that the human eye never could and some that a visual inspection could only hypothesize.

2. Reviews

Along with checking recommendations and previous work, finding reviews online can often be a great way to find out if they provide a good service or not. However, it’s best not to solely rely on reviews you may find or review websites, as there’s no controlling who writes them.

3. Compare prices

Comparing prices will also ensure companies can’t take advantage of you and give you a fair price. 

4. Word of Mouth

The best way to find a great insulation installer is through recommendations. Make sure you ask friends and family. They will most likely give you their honest opinion and can tell you from first hand experience.


Whether you require a wall, cladding, external wall, loft or floor insulation fitted, you can find and hire your local insulation installers from popular UK web pages. A simple internet search will return thousands of potential installers near your area.



We are the stockist of construction materials and related products for both trade and DIY from most recognizable brands in the UK like Cordek, RCM, Promat, Rockwool, Isover, Celotex, Xtratherm, Ursa, Low-E, Cedral, Kingspan, Dufaylite, British Gypsum, K-rend, Ecotherm, Iko enertherm, Kay-Metzeler, Terrawool to allow you to complete your insulation job on time at competitive prices and the highest standards.


Whether you are a large company or a DIYer, if you need a large amount of insulation materials, we can offer quantity discounts at the best prices. Please contact us and our friendly customer service will try to find the best and cheapest solutions for you. We value your time and we will try to deliver the products as soon as possible at a reasonable price to your construction site or house. The UK's leading insulation supplier near you and your needs. Price List available upon request.
34mm OSB Insulation Deck Flat Roof - 25mm Xtratherm PIR Rigid Insulation bonded to 9mm OSB Board - PlyDeck
34mm Xtratherm Plydeck PIR with OSB Flat Roof Insulation
£ 85.72