How To Insulate Between Roof Rafters

Consider using high density r 30 batts which are as thick as r 25 batts but fit into 2x10 framing.

How to insulate between roof rafters.

Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place. First climb into the attic and use measuring tape to determine the square footage of the space. Once you have these in place measure the length of the spaces between your rafters. If your attic is going to be converted into livable space then you will need to insulate the roof rafters.

Step 2 cutting and fitting the insulation. For a ventilated roof fix battens on the inside of the rafters 50mm from the underlay to leave vented air spaces. Your rigid boards will need to be cut to fit the gaps between the rafters. Step 1 measuring the space.

You can also add rigid foam insulation under the rafters which adds r value and eliminates thermal bridging through wood rafters. When they are cut ensure there is a. 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. Attach baffles to the bottom of the roof sheathing the plywood or solid wood strips onto which roofing material was installed.

The general advice we give is that you should always insulate between and above the rafters warm roof or between and under the rafters cold roof. Using rigid boards as opposed to wool is a much more precise. 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. Isover glass mineral wool gmw is another option for the between rafter insulation as a roll or batt.

Step 3 installing the insulation. How to insulate roof rafters. A vent baffle should be installed between the insulation and the roof decking to maintain the ventilation channel. Cut each piece of insulation an inch or two longer than needed to assure a snug fit.

Don a long sleeved shirt safety glasses gloves and a dust mask to prevent irritating fiberglass from reacting with. 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.