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Flat Roof Insulation

A flat roof is any roof space in your home with a pitch of less than 10 degrees. They are very easy to spot and as they don't usually have a loft space, they wont have a loft hatch.

Flat roofs being added to properties were popular in properties built between the 1950's - 1970's and if your flat roof is from this period, it is extremely unlikely to be insulated and if it is, it wont be up to todays standards. If your flat roof is uninsulated, it will mean that in winter, warm air will easily escape from any heated rooms through the flat roof, leaving the room cold and uninviting. 

If you have recently had the membrane replaced if for example you had a leak, then it is unlikely that insulation was added, unless you specifically asked for it.

There are 2 ways to insulate your flat roof:

Warm Roof:

This involves adding rigid insulation board on to the roof from the outside and then coving with a waterproof membrane. This is the best way to insulate a flat roof as there are no condensation issues to contend with.


Cold Roof:

This is the most common way that most households have their flat roofs insulated. It involves placing the insulation material between the joists spaces the support the roof. This can only be added if there is a gap of at least 50mm between the roof and the insulation to allow for air flow.

If you have very shallow joists then this is not recommended. 


As most heat is lost through uninsulated roof spaces, if you do have your flat roof insulated you can expect similar savings to insulating your loft depending on how much of your property the flat roof covers.

To check if you are eligible under the ECO4 scheme, please click the button below and complete the online form. 

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