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Although cold roof systems were used extensively in the past they are now considered out of date and are highly inadvisable.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

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

Reduce extreme temperature fluctuations inside your home. 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. This is then covered with a further weatherproofing layer. 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.

Why its important to insulate your flat roof. 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. Hi i have a flat roof extension built in the 1970s. The extension is for a quite small kitchen and bathroom very cold in winter.

Wondered if anyone else has come across a similar challenge what you did please. I ve recently had two. 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. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same.

Many properties use this option as there are no additional costs for scaffolding or organising how to gain safe access to the roof exterior. 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. Trying to insulate roof in 1970s extension to an old bungalow.