Insulating a “Room-in-Roof”

A common recommendation on EPCs is “Room-in-Roof insulation”. This short guide is to help you to understand what this means:

In order achieve the full points gain, and the full benefit of the improvement, all parts need to be insulated. It is possible jowever to insulate only some parts and achieve a partial gain.

Flat ceiling (Blue) - This is often the easiest, and is often insulated the same way as a standard pitched roof, with mineral wool.

Stud walls (green), these can often be insulated from behind (i.e. from the eves) using either mineral wool or rigid board insulation

Slope (orange) - this is often the most difficult as there will usually not be access to any space behind the plasterboard

Residual - This will form the roof over the remainder of the property that isn’t covered by the RiR, so will come under a different recommendation.

It is always worth first ascertaining what insulation already exists. We will usually be able to see the flat, residual and stud sections, but the slope in most cases will be unviewable. A building contractor may be able to drill a small hole to see inside. It is worth asking your assessor what they have been able to find, as the EPC doesn’t include much detail.

In order to make the improvement, speak to a qualified building contractor, and if you want to make sure what they are proposing will have the desired effect, you can send the specification to us for checking, and we can produce a modelling scenario based on the proposal.