Insulating A Flat Roof From Inside

I want to insulate below a flat roof without removing the existing ceiling.

Insulating a flat roof from inside.

This means there is a vapour control layer in the ceiling and cross ventilation at the eaves or the top of the walls. At least 100mm of rigid board insulation must be positioned on top of the vapour control layer the vapour control layer stops any moisture within the building. With a flat roof however this becomes a major concern. The existing ceiling is sound but provides no insulation.

The type that is right for your flat roof insulation job depends upon the state of the roof expert opinion on the best type and your budget. Cold roof a very bad idea. This may help with condensation but causes such a loss of heat that it has been banned in scotland. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same.

When you have an un insulated roof you have to live with. This is then covered with a further weatherproofing layer. 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. 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.

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. Why its important to insulate your flat roof. To produce a hot roof rigid insulation is fitted outside above the weatherproofing. Warm flat roof insulation.

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. Different types of roofing insulation exist including blanket insulation blown insulation and rigid insulation. Reduce extreme temperature fluctuations inside your home.

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