Don't just insulate it,
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Flat roof construction requires specialised insulation boards to support energy efficiency, minimise heat loss, and maintain durability in both new builds and refurbishment projects.
Retrofitting flat roof insulation is difficult, messy, and time-consuming. You'll also have to pull up the existing waterproof layer. So we'd always recommend getting it right the first time.
The best insulation boards for flat roofs
We're guaranteed to have the perfect insulation solution for every flat roofing application.
Our flat roof insulation boards meet the very highest standards for durability, compressive strength, and thermal performance. By preventing moisture buildup and condensation, they'll also help prolong the life of your roof.
Vacuum insulation board that maximises thermal performance projects with limited space. Truly your Problem Solver.
Flat board insulation is one of the best weight-bearing insulation types, but choosing the right product will depend on several factors, including the type of roof you're working on and the U-values you want to achieve.
Powerdeck® F is a PIR insulation board designed for flat roods on both new builds and refurbishment projects. Compatible with multiple waterproofing systems, Powerdeck® F can be used with built-up felt, mastic asphalt and single-ply membranes.
Powerdeck® U is a PIR insulation board that's specifically designed for warm flat roofs with bituminous torch-on felt waterproofing systems. Powerdeck® U provides excellent stability and has a compressive strength of >150kPa.
Deck-VQ® features encapsulated Vacuum Panel Insulation (VIP) with a core lambda of 0.006. It makes Deck-VQ® ideal for flat roofs with limited space. Deck-VQ® allows you to deliver performance without requiring additional modification to existing roofs.
Eurothane® Eurodeck is a thermal insulation board for use in warm flat roofs under mechanically fixed single-ply membrane waterproofing systems. Faced on both sides with multi-layer coated aluminium foil it is perfect for new builds and refurbishments.
Some of our insulation boards are designed for warm roofs, where insulation is placed above the timber deck and below the waterproof membrane, protecting against rain, wind, and temperature extremes. Warm roof decks also typically include a vapour control layer beneath the insulation.
As the name suggests, warm roof deck construction keeps the deck void at a similar temperature to the roof, eliminating the need for ventilation by reducing condensation risk, while also minimising heat loss, improving energy efficiency, and lowering heating bills.
With cold roof decks, insulation is installed below the deck, between the timber joints at ceiling level. As such, there's no need to replace the existing waterproof layer or raise the roofline, assuming the deck's structural integrity is intact.
Cold roof decks are at greater risk of condensation since void temperatures are colder than the room below, which can lead to moisture damage. However, they also typically have lower installation costs, take up less space, better support foot traffic, and are well-suited for outbuildings.
Our handy calculator tool can get the U-value you need in seconds.
Get prepared for your next project and try our free-to-use online U-value calculator now!
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