Insulating Old Roofs

The other option is loose fill or blown insulation.

Insulating old roofs.

U value 0 38w m. Apply a house wrap vapor barrier to exterior walls. Plasterboard 50mm pur insulation in 50mm timber stud with 50mm vented cavity to the existing wall. Replace old windows with energy efficient units.

Caulk window trim and use weatherstripping to reduce air leaks. Alternative options for insulating old roofs one modern option for existing buildings is sprayed foam. Permeable insulation works well with old buildings that breathe. Install siding over the insulation.

If there is only 25mm of insulating material then this is likely to date back to the 1970s as this type of. They are often advertised as a diy option but those who have done it suggest that it requires skill and experience to do well. Attach 1 inch foam board insulation. Available in both foam and rigid form choose the board type.

With an assumed pre existing u value of 2 23w m the best options are as follows. If you do have existing roof insulation the first thing to do is to check the depth. Suitable insulation includes natural fibre based products made of sheep s wool or hemp as well as mineral wools. Insulation board should be added between the old and new roof systems to ensure proper insulation and to reflect heat from the outside.

If you want to avoid internal changes you can do so by insulating externally.