How To Install Insulation Between Roof Rafters

Modern u value targets mean installing insulation between rafters only is rarely a viable option.

How to install insulation between roof rafters.

It allows insulation to be installed in a watertight roof either after the roof covering has been fixed on a new build or without disturbing an otherwise sound existing roof covering as part of a renovation. How to install rafter insulation. We would always recommend having a breathable membrane in place between the tiles and the rafters too to allow the roof to breathe. To create a warm pitched roof insulation such as kingspan kooltherm k7 pitched roof board should be fitted between and over the rafters.

Apply insulation between rafters when finishing an attic into a heated room or when building a cathedral ceiling in the home. Typically you will fill the insulation blower with the insulation and blow it between the attic floor joists. Measure the space between the rafters where the insulation will be placed and cut the insulation boards marginally wider than the space to ensure a friction fit upon installation. If you have a solid floor covering the roof rafters use the claw end of a hammer to pull the floor up in several locations and blow the insulation under the boards.

This roof type will require a breathable membrane like kingspan nilvent to be. As this requires fitting insulation above the rafters the roof covering will have to be removed in order to fit the insulation. Fit the cut quinn therm qr insulation boards tightly between the rafters with the quinn therm branded side facing into the building.