How To Insulate A Flat Roof Extension

Insulating a flat roof how much gap should i leave in between insulation and top of the roof.

How to insulate a flat roof extension.

I ve recently had two. How much gap should i leave in between the insulation and the top of the roof i m thinking of getting some kingspan to insulate. Many properties use this option as there are no additional costs for scaffolding or organising how to gain safe access to the roof exterior. Trying to insulate roof in 1970s extension to an old bungalow.

Hi i have a flat roof extension built in the 1970s. Wondered if anyone else has come across a similar challenge what you did please. As a refurb project i m resigned to not being to be able to meet best practise for new builds. Cold roof a very bad idea.

The insulation material is placed between the supporting joists leaving a gap of 50 60mm between the roof and insulation. They lose loads of heat and are prone to leaking causing the materials to deteriorate. This is then covered with a further weatherproofing layer. Due to a rewire i ve had to remove parts of the plasterboard ceiling and have found that there is no insulation in the roof i can see the roof deck and joists there is no vapour layer and the plasterboard is not foil backed.

Contractors installed new flat roof above shower room and kitchen extension with no insulation. Although cold roof systems were used extensively in the past they are now considered out of date and are highly inadvisable. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. To produce a hot roof rigid insulation is fitted outside above the weatherproofing.

I have been asked if the flat roof of my one storey extension could be used for access when they insulate the outside of the party wall with external wall insulation. Reduce extreme temperature fluctuations inside your home. Warm deck flat roof insulation is now the standard way to insulate a flat roof click to enlarge flat roofs for example on extensions bathrooms and dormer windows are not the best of ideas. 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.