Insulation For Between Roof Rafters

When you use solid insulation board to create a warm loft the key thing to remember is ventilation you must keep a 50mm gap between the roof and the rigid insulation board.

Insulation for between roof rafters.

Once up at roof level the between rafter boards can be cut accurately to fit the rafter spacings. A vent baffle should be installed between the insulation and the roof decking to maintain the ventilation channel. 7 staple sheets of 6 mil plastic over unfaced insulation to create a vapor barrier. Being lightweight they do not impose significant additional loads on existing structures.

You can also add rigid foam insulation under the rafters which adds r value and eliminates thermal bridging through wood rafters. Modern u value targets mean installing insulation between rafters only is rarely a viable option. Unfaced insulation has no tabs and stays in place with friction between the fiberglass and the rafters. In this blog post we will be looking at insulating pitched roofs and why putting insulation just between the rafters isn t a viable solution.

Consider using high density r 30 batts which are as thick as r 25 batts but fit into 2x10 framing. The general advice we give is that you should always insulate between and above the rafters or between and under the rafters on our u value calculator we don t give an option for putting insulation between the rafters.