Roof Rafter Insulation Boards

Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels.

Roof rafter insulation boards. Furring straightens out rafter plane for smooth plaster finish. Depending on the specifics of the roof it may be possible to fully fill the rafter depth or in most cases leave a 25mm or 50mm air gap between the top face of the insulation and the sarking membrane. The later is used in new construction as the interior board serves as an inner wall. For an un ventilated roof construction a vapour open underlay or breather.

Your rigid boards will need to be cut to fit the gaps between the rafters. Once up at roof level the between rafter boards can be cut accurately to fit the rafter spacings. Measure the space between the rafters where the insulation. Baffles are also called wind baffles venting chutes rafter vents or insulation baffles.

Insulation is friction fitted between rafters with the option to underline the rafters with a layer of thermal laminate to further enhance thermal performance. Rigid polyisocyanurate pir foam insulation boards from celotex are among the most thermally efficient commonly available insulation materials on the market. Being lightweight they do not impose significant additional loads on existing structures. When they are cut ensure there is a.

Photograph 1 above left. It typically has 3 variations. Yes skylights went in. Original roof uninsulated rafter framing with board roof deck.

This over rafter insulation method also reduces thermal bridging giving an airtight continuous layer of high performance insulation and results in a well insulated attic space. But a space needs to be a space or what is the point. Some types of thicker foam board insulation are available but they may need to be special ordered. Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building.

Foam board insulation is easy to use and is a great diy way to add some insulation. Celotex polyisocyanurate pir foam insulation boards are easy to cut and handle. Rigid foam board is just above the roof deck or an exterior insulation option. For a ventilated roof fix battens on the inside of the rafters 50mm from the underlay to leave vented air spaces.

It took us many millennia to get out of caves. Typically made from polyvinyl. Yes they are big thermal holes. Install underlay above the rafters.

Using rigid boards as opposed to wool is a much more precise. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.