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    Timber frame extension-insulated plasterboard on reveals...?

    I'm currently having a timber framed extension built at the rear of my house. It's north facing. I've gone with a flat roof. Warm roof with 150mm rigid insulation over the beams. The beams are 175mm. The ceiling will be 62.5mm insulated plasterboard below the beams. I've also got 2 large U6...
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    Roof windows and overall roof U-value

    I have an extension starting soon. It will have a vaulted roof. I'm trying to decide whether to use Fakro U8 quadruple glazed or U6 triple glazed roof windows. The U8 U-value is 0.58 and the U6 U-value is 0.81. The roof (excluding the roof windows) will have a U-value of 0.15. The walls...
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    Roof windows query

    I am currently planning an extension to the rear of my house. It’s north facing and never gets sunshine. I’ll have two external walls. The walls will have a 150 mm pumped cavity with 62.5 mm Kingspan insulated plasterboard on the inside. My U value will be about 0.15. The sloping roof will...
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