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- The recommended thickness for wall insulation depends on the type of insulation and the desired U-value12345:
- For solid walls, at least 100mm of rigid insulation is needed to achieve a U-value of 0.3W/m2 or lower.
- External wall insulation should be between 100mm and 150mm thick to achieve the desired U-rating.
- Glass wool insulation should be 270mm thick.
- Insulation slab should be 250mm thick.
- Cellulose insulation should be 220mm thick.
- External wall insulation can be approximately 60mm to 100mm thick, depending on the existing wall material.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Current Building Regulations require a maximum U value of 0.3W/m2 and realistically 0.2W/m2. Achieving that U value for solid walls will mean installing at least 100mm of rigid insulation (Celotex, Kingspan or similar)www.homebuilding.co.uk/advice/internal-wall-insul…When installing external wall insulation, you should be looking to install between 100mm and 150mm in thickness to achieve the desired U-rating of 0.3 W/m 2 k or lower.www.buildingmaterials.co.uk/info-hub/insulation/ho…As such, the current recommendations when buying insulation are as follows:
- 270mm for glass wool insulation
- 250mm for insulation slab
- 220mm for cellulose insulation
www.insulationsuperstore.co.uk/help-and-advice/pr…The thickness of the insulation needs to be between 50 and 100mm and is usually installed where there are severe heating problems or the exterior of the building requires some form of other repair work providing the opportunity of adding insulation.www.planningportal.co.uk/permission/common-proj…External wall insulation needs to be the right thickness to achieve 0.3W/m2K or better. This means that your external wall insulation should be approximately 60mm and can be up to 100mm, but this will depend on the material your existing wall is made from.www.therm-eco.net/how-thick-should-external-wall … - People also ask
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