Insulating Old Roofs

Alternative options for insulating old roofs one modern option for existing buildings is sprayed foam.

Insulating old roofs.

Replace old windows with energy efficient units. Permeable insulation works well with old buildings that breathe. Equally the reverse is true. Insulation board should be added between the old and new roof systems to ensure proper insulation and to reflect heat from the outside.

Apply a house wrap vapor barrier to exterior walls. With an assumed pre existing u value of 2 23w m the best options are as follows. The other option is loose fill or blown insulation. Install siding over the insulation.

Caulk window trim and use weatherstripping to reduce air leaks. Plasterboard 50mm pur insulation in 50mm timber stud with 50mm vented cavity to the existing wall. Available in both foam and rigid form choose the board type. Attach 1 inch foam board insulation.

U value 0 38w m. If you want to avoid internal changes you can do so by insulating externally. If there is only 25mm of insulating material then this is likely to date back to the 1970s as this type of. There is a good deal of controversy around these systems.

They are often advertised as a diy option but those who have done it suggest that it requires skill and experience to do well.