Insulating Old Roofs

Install siding over the insulation.

Insulating old roofs.

Insulation board should be added between the old and new roof systems to ensure proper insulation and to reflect heat from the outside. U value 0 38w m. Available in both foam and rigid form choose the board type. There is a good deal of controversy around these systems.

Permeable insulation works well with old buildings that breathe. One way to insulate walls of an old house is to focus on the home s exterior. With an assumed pre existing u value of 2 23w m the best options are as follows. Plasterboard 50mm pur insulation in 50mm timber stud with 50mm vented cavity to the existing wall.

The other option is loose fill or blown insulation. Alternative options for insulating old roofs one modern option for existing buildings is sprayed foam. Apply a house wrap vapor barrier to exterior walls. Equally the reverse is true.

If there is only 25mm of insulating material then this is likely to date back to the 1970s as this type of. Caulk window trim and use weatherstripping to reduce air leaks. If you want to avoid internal changes you can do so by insulating externally. Attach 1 inch foam board insulation.

If you do have existing roof insulation the first thing to do is to check the depth.