How To Insulate A Flat Roof Extension

Although cold roof systems were used extensively in the past they are now considered out of date and are highly inadvisable.

How to insulate a flat roof extension.

To produce a hot roof rigid insulation is fitted outside above the weatherproofing. Cold roof a very bad idea. Hi i have a flat roof extension built in the 1970s. 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.

They lose loads of heat and are prone to leaking causing the materials to deteriorate. I ve recently had two. 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. 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.

Wondered if anyone else has come across a similar challenge what you did please. Reduce extreme temperature fluctuations inside your home. Why its important to insulate your flat roof. The extension is for a quite small kitchen and bathroom very cold in winter.

Contractors installed new flat roof above shower room and kitchen extension with no insulation. Many properties use this option as there are no additional costs for scaffolding or organising how to gain safe access to the roof exterior. 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. This is then covered with a further weatherproofing layer.

As a refurb project i m resigned to not being to be able to meet best practise for new builds. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. Trying to insulate roof in 1970s extension to an old bungalow. 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.