How To Insulate Between Roof Rafters

If your attic is going to be converted into livable space then you will need to insulate the roof rafters.

How to insulate between roof rafters.

Step 1 measuring the space. Once you have these in place measure the length of the spaces between your rafters. Step 3 installing the insulation. How to install rafter insulation.

Attach baffles to the bottom of the roof sheathing the plywood or solid wood strips onto which roofing material was installed. A vent baffle should be installed between the insulation and the roof decking to maintain the ventilation channel. 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. 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.

Use your straightedge to compress the insulation before cutting and use a very sharp utility knife to assure a good straight cut across the fiberglass batt. First climb into the attic and use measuring tape to determine the square footage of the space. Consider using high density r 30 batts which are as thick as r 25 batts but fit into 2x10 framing. Using rigid boards as opposed to wool is a much more precise.

How to insulate roof rafters. When they are cut ensure there is a. Don a long sleeved shirt safety glasses gloves and a dust mask to prevent irritating fiberglass from reacting with. Cut each piece of insulation an inch or two longer than needed to assure a snug fit.

Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place. Isover glass mineral wool gmw is another option for the between rafter insulation as a roll or batt. For a ventilated roof fix battens on the inside of the rafters 50mm from the underlay to leave vented air spaces. You can also add rigid foam insulation under the rafters which adds r value and eliminates thermal bridging through wood rafters.

Your rigid boards will need to be cut to fit the gaps between the rafters. Again make sure you select the right thickness of the material so you fill as much of the rafter gap as possible.