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100mm FR/MG Thin-R Xtratherm PIR Flat Roof Insulation Board ǀ pack of 5

100mm Xtratherm FR/MG Flat Roof PIR Board - Single Ply Fully Adhered Systems (pack of 5)
100mm FR/MG Thin-R Xtratherm PIR Flat Roof Insulation Board ǀ pack of 5
  • 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
Estimated delivery:
In Stock
£ 191.56
Ex VAT: £ 159.63
  • Brand: Xtratherm®
  • Model: 100mm FR/MG
  • Dimensions: 1,200mm x 600mm x 100mm
  • SKU: 100mm
  • Product code: P1-1039
  • MPN: 100mm Xtratherm FR/MG Thin-R

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100mm 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 Roof Thin-R board is compatible with adhesively bonded single ply roofing membranes.

FR/MG Thin-R range is thermally efficient roofing board designed for flat roof projects.

Xtratherm PIR insulation boards are stable, rot proof and will remain effective for the life span of the building (depending on specification and installation).

Thin-R provides the most efficient U-values with minimal intrusion into valuable living space. 

FR/MG if correctly installed can reduce heat loss and save money on energy bills (excellent thermal bridging details).

Care should be taken to avoid contact with acids, petrol, alkalis and mineral oil, when contact is made, clean materials in a safe manner before installation.

Thin-R insulation foam core and mineral coated glass facings resist attack by mould, fungi, bacteria and microbial growth.

Xtratherm FR/MG boards are suitable for use on roof decks that are subject to maintenance traffic.

Walkways should be provided on roofs requiring regular pedestrian access. 

When the roof is complete, protective boarding should be laid if additional site work is to be carried out.




Width: 600mm

Length: 1200mm

Pack Quantity: 5

Pack Coverage: 3.60m2

Board Coverage: 0.72m2

Profile: Square Edge

R-Value: 4.16m2K/W

Density (Foam Core): 32kg/m3 

Thermal Conductivity: 0.024W/mK

Compressive Strength: >150 (kPa)


Key points:

 · BBA certified.

 · High thermal performance.

 · Easy to handle 1200mm x 600mm boards.

 · High compressive strength >150 kPa.

 · Compatible with adhesively bonded single ply roofing membranes.

 · Faced with a mineral coated glass.

 · Good thermal conductivity (λ - lambda value) 0.024 - 0.027 W/mK.


Vapour Control Layer (VCL):

A continuous approved vapour control layer should be used below the insulation (Unless over a sealed metal deck system).

For mechanically fixed boards, a minimum vapour control layer of a 1000 gauge polythene layer lapped and sealed with double-sided tape should be used below the insulation. 

At vertical upstands and penetrations, the VCL should be turned up and sealed to encapsulate the insulation layer prior to the roof finish being completed. 

A comprehensive U-value calculation and condensation risk analysis should be carried out for all projects.


Certification and standards:

 · Standard - BS EN 13165.

 · BBA Certification No. 11/4878. 

 · BS EN ISO 9001 Quality Management System.

 · BS EN ISO 14001 Environmental Management System.


*For comprehensive calculations on all deck types, please contact Xtratherm Technical Support.

*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 3.60 m2
Colour Cream
Length 1200mm
Material Polyisocyanurate (PIR)
Pack Coverage 3.60m2
Pack Quantity 5
Profile Square Edge
R-Value 4.16m2K/W
Thermal Conductivity 0.024W/mK
Thickness 100mm
Width 600mm
Coverage 0.72m2
Finish Mineral coated glass facers
Quantity 5
Shipping method Articulated Vehicle ǀ Courier
Applications Flat Roof
BBA Certified Yes (No. 11/4878)
ETA Notification Yes
Features Mineral coated glass facers
Manufacturer Xtratherm Thin-R®

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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.
100mm Xtratherm FR/MG Flat Roof PIR Board - Single Ply Fully Adhered Systems (pack of 5)
100mm FR/MG Thin-R Xtratherm PIR Flat Roof Insulation Board ǀ pack of 5
£ 191.56