Roof Rafter Insulation Boards

Once up at roof level the between rafter boards can be cut accurately to fit the rafter spacings.

Roof rafter insulation boards.

Our insulation solutions for warm roofs maximise both space and thermal efficiency whilst also contributing to acoustic performance. Yes they are big thermal holes. It took us many millennia to get out of caves. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.

The later is used in new construction as the interior board serves as an inner wall. It typically has 3 variations. Again make sure you select the right thickness of the material so you fill as much of the rafter gap as possible. Baffles provide a channel for air to flow through certain parts of the attic.

Rigid foam board is just above the roof deck or an exterior insulation option. Insulation is friction fitted between rafters with the option to underline the rafters with a layer of thermal laminate to further enhance thermal performance. Foam board insulation is easy to use and is a great diy way to add some insulation. Photograph 1 above left.

Being lightweight they do not impose significant additional loads on existing structures. For an un ventilated roof construction a vapour open underlay or breather. Measure the space between the rafters where the insulation. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels.

Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building. Rigid polyisocyanurate pir foam insulation boards from celotex are among the most thermally efficient commonly available insulation materials on the market. For a ventilated roof fix battens on the inside of the rafters 50mm from the underlay to leave vented air spaces. But a space needs to be a space or what is the point.

Install underlay above the rafters. When they are cut ensure there is a. Original roof uninsulated rafter framing with board roof deck. Yes skylights went in.

Some types of thicker foam board insulation are available but they may need to be special ordered. 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. Typically made from polyvinyl.

Your rigid boards will need to be cut to fit the gaps between the rafters. Celotex polyisocyanurate pir foam insulation boards are easy to cut and handle.