How To Insulate Between Roof Rafters

When they are cut ensure there is a.

How to insulate between roof rafters.

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. Step 2 cutting and fitting the insulation. Don a long sleeved shirt safety glasses gloves and a dust mask to prevent irritating fiberglass from reacting with. Step 1 measuring the space.

How to install rafter insulation. A vent baffle should be installed between the insulation and the roof decking to maintain the ventilation channel. Step 3 installing the insulation. Attach baffles to the bottom of the roof sheathing the plywood or solid wood strips onto which roofing material was installed.

Using rigid boards as opposed to wool is a much more precise. If your attic is going to be converted into livable space then you will need to insulate the roof rafters. Cut each piece of insulation an inch or two longer than needed to assure a snug fit. Isover glass mineral wool gmw is another option for the between rafter insulation as a roll or batt.

Once you have these in place measure the length of the spaces between your rafters. Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place. 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. Again make sure you select the right thickness of the material so you fill as much of the rafter gap as possible.

Your rigid boards will need to be cut to fit the gaps between the rafters. You can also add rigid foam insulation under the rafters which adds r value and eliminates thermal bridging through wood rafters. The flexible nature of gmw means that the roll or batts can be accurately cut and friction fitted between the rafters thereby minimising air gaps and maximising thermal performance. Consider using high density r 30 batts which are as thick as r 25 batts but fit into 2x10 framing.

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. How to insulate roof rafters.