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What you need to know

Around 25% of heat lost from an un-insulated home goes through the roof. The good news is you can easily insulate a loft space or new roof to achieve the Heat loss 2006 amendment of the building regulation standards for roof insulation.

U values can be achieved with various types of insulating systems. If you are renewing a flat roof or a pitched tiled roof it is law that you comply with the heat loss regulations. There are certain exemptions in the flat roofing if you are refurbishing an existing covering then you do not need to comply but are advised to improve the existing. If this is not done correctly then there is always a possibility that you may cause thermal bridging. So it is always best to use a suitable competent licensed installer as they have the back up of a technical team from the systems manufacturers and are usually best suited to advice on correct application procedures.

You may be entitled to a reduction in VAT as the government are currently offering subsidiaries for vat for improvement of heat loss in the home, and for certain people over the age of 60. This information is stated here for you to look at on the you Gov website.

Installation of insulation is a must and on older period properties you will usually find they are losing a lot more heat than newer aged property .

You are likely to be losing a third of your heating costs through your roof if your loft is insufficiently insulated.

this can be remedied by insulating your loft to the recommended depth of 300mm This in time will save wasted energy and money.

A standard loft insulation installation comprises not only of the fitting of the loft insulation, but also the bringing up to Building Regulations standards, the lagging to the cold water tanks and the pipes and loft hatch panel. This means that there is no possibility of any pipes or tanks bursting during colder weather.

Your loft hatch should also be draft proofed and insulated where possible.

Flat roof installs are laid different usually with a ridged insulation 120mm is typically the equivalent to 300mm of rockwall giving the standard u value for 2022.


A example of a typical flat roof insulation install

This type of insulation at 120mm laid on a ply wood decking eliminates cold spotting and is acheived by fitting roof insulation built into the roofing system

Vapour barrier

All ridged insulation should be laid with a vapour control layer to avoid condensation damaging the deck. There are many ways to do this, the illustration above is a Protan vapour barrier being laid for a single ply install a 120mm rigid roof insulation

A typical warm deck flat roof build up

the five layers built up as follows substrate,vapour barrier,insinuative deck Tr27 for torch applied bituminous membranes, followed by the roof system


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