Insulating Roofs & Lofts

Insulating an open loft with Warmcel


To insulate lofts we use an open blown method. This makes it easy to add cellulose fibre to any depth as required. Building regulations specify a minimum of 250mm, but the blown installation system means it is often cost effective to install to greater depths.

Cellulose roof insulation

Pitched Roofs

To insulate pitched roofs we use the ‘dry injection’ method. As when insulating walls, we cut a hole in the covering board or membrane and blow insulation into the void behind. Holes are patched once each cavity is filled.

Until recently, many houses we built with a bitumen felt underneath the roof tiles. This is impermeable to vapour. It is essential to leave an air gap between the insulation and felt to prevent condensation problems. Modern roofing felts are normally ‘breathable’ and do not require an air gap. With details of your roof construction, we can assess whether insulation is possible.

Flat Roofs

Flat roofs always have an impermeable covering, so an air gap must be left above the insulation. In many cases flat roofs lack access to create this space. We assess each customers needs on a case-by-base basis, so do get in touch to discuss your project.

We have now had December snow and January Ice and gales and am pleased to report how much better the house is since Joylon and Mark installed the roof insulation upgrade. The Oil fired C.H. system is not on more than previous Spring / Autumn use, and the ground floor extension is so much better.  We are so pleased we had Devana do this project for us using cellulose insulation that was able to fit all the complex spaces. Many thanks.
Chris P.
Chris P.

About Devana

We are specialist installers of cellulose fibre insulation, installing all over the country from our Cambridgeshire base.

With a wealth of experience covering insulation, building and design; we would love to find out how we can help with your project.

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Devana Insulation Limited 
81A Fred Dannatt Road
IP29 7RD

01638 501069

Retrovive Floor

Retrovive Floor is the only system that can install insulation underneath your traditional suspended wooden ground floor WITHOUT taking up all the floorboards.

Visit our Retrovive Floor website for details.