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UKFR - ROOFING AND INSULATION SPECIALISTS
Warm roof insulation is used on modern flat roof projects and installed directly under the waterproof membrane, allowing you to achieve thermal efficiency without the need for ventilation. From highly reputable brands including Rockwool, Kingspan and Ecotherm, you can find the right warm deck insulation for your project.
Shop all Warm Roof Insulation
Insulated roofs are essential for lowering heating costs.
At UKFR, we supply a wide range of warm flat roof insulation from reliable and trusted manufacturers including Rockwool, Ecotherm, Recticel, and Kingspan. Designed to increase your home’s thermal performance, these are ideal for warm deck flat roof installation.
For more information, please visit our full warm deck flat roofing construction guide.
If you are also looking for a fireproof roofing solution Rockwool Hardrock is commonly used in warm deck flat roofs. This flat roofing insulation board provides an A2 fire rated insulation to be used.
No matter your requirements, we’re confident you’ll get what you’re looking for, see our range of products:
Most of the ranges will reach the required U-Value needed but if you need help confirming spec’s please contact us or use the manufactures U-Value Calculators.
Need help choosing what the right product is for your home? Contact us today via email or phone to get in touch with our helpful customer support team.
At UKFR, it’s our goal to supply customers all across the UK with reliable & cost-effective solutions for home heating retention. We have an “exceptional” feefo rating thanks to our in-depth product range and highly knowledgeable customer service team. Shop with confidence today!
There are two types of insulation for flat roofs - cold deck and warm deck.
Cold deck insulation is used on older flat roofs and loft spaces where the structural deck is exposed. They require a ventilated air gap above the insulation to prevent condensation issues.
On the other hand, warm deck insulation is far easier to install, as it’s placed directly underneath the waterproof membrane, keeping the entire roof structure warm without needing ventilation.
Because of this, warm deck insulation has become increasingly popular with modern flat roof systems.
The best insulation for a warm roof depends on project specifics like waterproofing type, thermal requirements, and height restrictions.
For single-ply roofing, such as EPDM rubber, a tissue-faced PIR board is ideal. Mechanically fixed membranes work best with foil-faced PIR, while torch-on felt requires bitumen-faced PIR. Renovations typically need 150mm insulation thickness, while new builds require 220mm.
For applications needing A-Class fire ratings, Rockwool Hardrock is the only A2-rated option for warm roofs. Though thicker than PIR for equivalent thermal performance, it offers excellent fire resistance and acoustic benefits, suitable for both flat and pitched roofs.
