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41mm FR/TP Xtratherm Thin-R Thermal Ply Flat Roof Insulation Board

41mm PlyDeck Xtratherm FR/TP Flat Roof Board Thermal Ply Decking PIR Insulation bonded to 6mm WBP Plywood
41mm PlyDeck Xtratherm FR/TP Flat Roof Board Thermal Ply Decking PIR Insulation bonded to 6mm WBP Plywood
41mm PlyDeck Xtratherm FR/TP Flat Roof Board Thermal Ply Decking PIR Insulation bonded to 6mm WBP Plywood
41mm PlyDeck Xtratherm FR/TP Flat Roof Board Thermal Ply Decking PIR Insulation bonded to 6mm WBP Plywood
41mm FR/TP Xtratherm Thin-R Thermal Ply Flat Roof Insulation Board
  • Insulation & Decking in one Fix
  • Vapour Control Layer build in
  • For New & Refurbishment Roofs
  • Rapid Weather Proofing
  • PlyDeck FR/TP Square Edge
Estimated delivery:
In Stock
£ 84.16
Ex VAT: £ 70.13
  • Brand: Xtratherm®
  • Model: 41mm FR/TP
  • Dimensions: 2,400mm x 1,200mm x 41mm
  • SKU: 41mm
  • Product code: P1-718
  • MPN: 41mm-FR/TP-Thermal-Ply

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41mm 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 solution designed to provide high levels of thermal insulation, vapour control layer and decking in one easy applicable product.

Xtratherm Thin-R FR/TP is a high-performance composite insulated panel that is suitable for use with mechanically fixed single-ply waterproofing membranes, mastic asphalt, roll & pour and adhered systems.

FR/TP Thermal Ply insulation core and composite foil facings resist attack by mould, fungi, bacteria and microbial growth.

Xtratherm FR/TP Pre-insulated Roof Decking is designed for use on new roofs or upgrading the thermal performance of existing roofs.

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

Xtratherm added between the joists to increase the thermal performance of the roof or to allow a reduction in the thickness of material over the joists.

Thin-R Thermal Ply 2400mm x 1200mm provides rapid weather proofing and reliable long term energy savings for buildings.

The thermal conductivity of the PIR insulation board is 0.022 W/mK (Lambda value).

The thermal conductivity of the 6mm WBP Plywood is 0.14 W/mK (Lambda value).




Thickness: 41mm overall (35mm PIR Insulation bonded to 6mm WBP Plywood)

Size: 1200mm x 2400mm

Board coverage: 2.88m2

Density (Foam Core): 32 Kg/m3

Profile: Square Edge

Thermal Conductivity: 0.022 W/mk

R-Value: 1.59m2K/W

Compressive Strength: >150 kPa (10% Compression)

Water Vapour Resistivity: >100 MNs/gm


Key points:

 · Provides reliable long term energy savings for buildings.

 · Insulation and decking in one fix.

 · For new build and refurbishment roofs.

 · Installed and weatherproofed rapidly.

 · Accepts a wide variety of weathering systems.

 · Available in a standard board size of 1200mm x 2400mm (8x4 sheets).

 · Easy to install.



BS EN ISO 9001 Quality Management System

BS EN ISO 14001 Environmental Management System


Thermal conductivity is dependent on facings and product thickness.


*Further information may be found in our Downloads section.

Fairly easy access to all PDF files.

Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheet 

*Special Product - Non returnable cancelable.

Board covarage 2.88 m2
Compressive Strength 150 kPa (10% Compression)
Density 32 Kg/m3
Length 2400mm
Material Polyisocyanurate core ǀ Plywood
Profile Square Edge
R-Value 1.59m2K/W
Size 1200mm x 2400mm
Thermal Conductivity 0.022 W/mk
Thickness 41mm overall
Water Vapour Resistivity 100 MNs/gm
Weight 25.97kg
Width 1200mm
Vapour Resistivity 100 MNs/gm
Finish Gas-tight foil ǀ WBP Plywood
Shipping method Articulated Vehicle ǀ Courier
Applications Flat Roof ǀ Hot Bitumen ǀ Decking
ETA Notification Yes
Features Rapid Weather Proofing ǀ 3 in 1 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.
41mm PlyDeck Xtratherm FR/TP Flat Roof Board Thermal Ply Decking PIR Insulation bonded to 6mm WBP Plywood
41mm FR/TP Xtratherm Thin-R Thermal Ply Flat Roof Insulation Board
£ 84.16