Insulating A Flat Roof From Inside

I ve built a timber frame to support a new plasterboard ceiling below the existing one.

Insulating a flat roof from inside.

Because most flat roofs don t have an attic crawl space or venting the insulation must go underneath the roof s covering on the exterior of the home or be placed on the inside of the home. Lots of traditional flat roofs are of the cold roof construction type. There is only a small gap between this ceiling and a concrete roof cold roof felt covered. To produce a hot roof rigid insulation is fitted outside above the weatherproofing.

This may help with condensation but causes such a loss of heat that it has been banned in scotland. Reduce extreme temperature fluctuations inside your home. Flat roof insulation energy saving trust flat roof insulation fasteners flat roof insulation fiberglass flat roof insulation fixings flat roof insulation. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same.

This means there is a vapour control layer in the ceiling and cross ventilation at the eaves or the top of the walls. One of the main benefits you will receive from installing a warm flat roof is condensation will not become an issue because of the positioning of the insulation. Cold roof a very bad idea. Why its important to insulate your flat roof.

This is then covered with a further weatherproofing layer. I want to insulate below a flat roof without removing the existing ceiling. While insulation for a flat roof is expensive and can account for as much as 25 of the total installation cost there are a number of important benefits to having it in place. Warm flat roof insulation.

Cold flat roof insulation. Different types of roofing insulation exist including blanket insulation blown insulation and rigid insulation. The existing ceiling is sound but provides no insulation. With a flat roof however this becomes a major concern.

Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. When you have an un insulated roof you have to live with.