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Kooltherm K7 Pitched Roof Board
Premium performance pitched roof insulation board
Dormer Cheek and Dormer Roof Constructions
Whether you are building a new property, completing a dormer extension or upgrading your existing dormer, there are a number of dormer insulation solutions available. On this page you will find:- Our dormer cheek and dormer roof insulation options
- A comparison of the different solutions we offer so you can select the right product for your project - scroll down the page for a full comparison table
- Useful links to help with your project, inlcuding our U-value calculator.
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Compare our Dormer Insulation Solutions
The table below shows the different options available. Note the lower the thermal conductivity, the better the thermal performance. Selecting better thermal performing products may mean you can use a thinner board. This can be benefecial in dormers where you want to maximise space and the amount of daylight entering the building.
Product | Application | Thermal conductivity |
|---|---|---|
Dormer cheeks | 0.021 - 0.022 W/mK | |
Dormer cheeks | 0.022 W/mK | |
Pitched dormer roofs | 0.021 - 0.022 W/mK | |
Pitched dormer roofs | 0.022 W/mK | |
Flat dormer roofs waterproofed with mechanically fixed single-ply waterproofing | 0.022 W/mK | |
Flat dormer roofs waterproofed with fully adhered single-ply, partially bonded built-up felt, mastic asphalt and cold liquid applied waterproofing | 0.024 - 0.027 W/mK |
Page updated: 28/05/2025