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25mm Unilin Xtratherm Thin-R PIR Insulation Board 2400mm x 1200mm
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25mm Unilin Xtratherm Thin-R is a high-performance thermal insulation PIR board with composite foil facings. It can be used for roof, floor, wall and timber joist applications.
25mm Unilin Xtratherm Thin-R PIR Insulation Board (2400mm x 1200mm) achieves exceptional thermal insulation with minimal thickness. This high-performance, BBA certified rigid insulation board from Unilin Insulation features a polyisocyanurate (PIR) core bonded to low-emissivity foil facings.
With an exceptionally low thermal conductivity of just 0.022 W/mK, it's an ideal solution for roofs, walls, and floors where space is limited but meeting stringent UK energy efficiency standards (Building Regulations Part L) is essential. Each 2.4m x 1.2m board covers 2.88m².
Benefits
Thermal Efficiency: Thermal conductivity of 0.022 W/mK provides excellent thermal resistance, significantly reducing heat loss and helping lower energy costs.
Ultra-Thin Solution: At just 25mm thick, this board allows you to achieve impressive insulation levels without sacrificing valuable internal room dimensions or requiring deep construction adjustments.
Foil Faced for Enhanced Performance: Low emissivity foil facings on both sides reduce radiant heat transfer across adjacent air cavities and contribute to the board's overall thermal performance. When joints are correctly taped, the facing also provides high vapour resistance.
Multi-Application Versatility: Suitable and BBA certified for a wide range of applications including roofs, walls, floors, timber and steel framed systems.
Durable & Moisture Resistant: The rigid PIR core resists moisture absorption and will not rot, degrade, or support mould growth, ensuring long-term performance.
Lightweight & Rigid: Easy to transport, handle, cut, and install by professionals and competent DIYers.
Environmentally Considered: Manufactured with a blowing agent that has Zero Ozone Depletion Potential (ODP) and a Low Global Warming Potential (GWP).
Applications
Xtratherm Thin-R Rigid Insulation Board is a multi-application product designed for roofs, walls, floors, timber and steel framed systems. These 25mm boards can be cut to fit in between stud work, laid under a screed floor, or installed between rafters in a pitched roof.
Storage, Handling & Cutting
The polythene wrapping in which the boards are supplied is not considered adequate protection for outside exposure.
Care should be taken to protect the insulation in storage and during the build process. To keep them in the best condition, we advise that you store the boards indoors on a level surface and under a protective cover.
The insulation boards can be readily cut using a sharp knife or fine-toothed saw.
Delivery & Returns Information
Delivery charges vary by product category and order value. Items may ship from different suppliers and arrive separately, so delivery charges can be shown per part of your order at checkout.
Standard (Nationwide) Delivery
Core Products
Core
ORDER VALUE
DELIVERY CHARGE
Under £250
ex. VAT
£25
ex. VAT
Over £250
ex. VAT
FREE
Core Delivery is our most competitive delivery fee. To qualify for Core Delivery, all the products in your basket need to be from our Core range. Core products have the Core icon next to their picture.
Insulation, Plasterboard and Drylining Products
ORDER VALUE
DELIVERY CHARGE
Under
£350
£45
ex. VAT
Over
£350
ex. VAT
FREE
Express Delivery
Express Delivery - Insulation and Plasterboard & Drylining
We work with a nationwide network of trusted suppliers. Items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you will see delivery charges shown at checkout for each part of your order. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery areas
Delivery charges apply to mainland UK, excluding: AB, CA, CF, DD, DG, EH, EX, FK, KA, KW, KY, IV, LA, LD, LL, ML, NP, PA, PH, PL, SA, SY, TR, TQ and TD.
If your address is in one of these areas, we will contact you before processing your order to confirm any additional costs. We do not currently offer delivery outside the UK mainland.
What to expect on delivery day
Deliveries are typically kerbside.
Please ensure someone is on-site to accept delivery. For heavier items, help with offloading may be required.
Many building materials arrive on large vehicles. If access is restricted, a specialist vehicle such as a HIAB may be required and could incur an additional charge.
Why delivery can cost more than typical parcel delivery
Building materials often travel on larger vehicles and usually carry fewer drops per run than parcel networks. That is why delivery charges can be higher than standard e-commerce shipping.
Returns
Returns depend on what you have bought and whether there is anything wrong with it. For full details on eligibility, timeframes, and exclusions, please see our full policy.
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