Roof Rafter Insulation Boards

Install underlay above the rafters.

Roof rafter insulation boards.

Once up at roof level the between rafter boards can be cut accurately to fit the rafter spacings. Our insulation solutions for warm roofs maximise both space and thermal efficiency whilst also contributing to acoustic performance. When they are cut ensure there is a. Rigid polyisocyanurate pir foam insulation boards from celotex are among the most thermally efficient commonly available insulation materials on the market.

Typically made from polyvinyl. It typically has 3 variations. 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. Baffles provide a channel for air to flow through certain parts of the attic.

Original roof uninsulated rafter framing with board roof deck. Your rigid boards will need to be cut to fit the gaps between the rafters. For a ventilated roof fix battens on the inside of the rafters 50mm from the underlay to leave vented air spaces. Photograph 1 above left.

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. Rigid foam board is just above the roof deck or an exterior insulation option. Some types of thicker foam board insulation are available but they may need to be special ordered. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels.

For an un ventilated roof construction a vapour open underlay or breather. Yes skylights went in. Insulation is friction fitted between rafters with the option to underline the rafters with a layer of thermal laminate to further enhance thermal performance. Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building.

Being lightweight they do not impose significant additional loads on existing structures. Again make sure you select the right thickness of the material so you fill as much of the rafter gap as possible. Baffles are also called wind baffles venting chutes rafter vents or insulation baffles. Celotex polyisocyanurate pir foam insulation boards are easy to cut and handle.

Using rigid boards as opposed to wool is a much more precise. It took us many millennia to get out of caves. Foam board insulation is easy to use and is a great diy way to add some insulation. But a space needs to be a space or what is the point.

The later is used in new construction as the interior board serves as an inner wall. Measure the space between the rafters where the insulation.