How To Insulate A Roof With Exposed Rafters

The screws secure the counter purlin to each rafter or top chord.

How to insulate a roof with exposed rafters.

How to expose rafters and still provide insulation. Cut the boards along the marked lines by placing a straightedge against them. Firstly just to make it clear when we are talking about rafter level we mean the timbers that support the pitched. Step 5 cover the rest of the roof s underside with insulation boards using the same process you used for the first board.

The basic approach to insulating a roof with exposed rafters involves placing insulation on the exterior side of the finish ceiling and covering the insulation with a layer of sheathing. Check out our how to video at the link below. Time to get the insulation finished and get this place warm. Hire a pro to install spray foam insulation.

If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters. When insulating a pitched roof at rafter level there are a number of key design considerations which will affect the build up of the roof and the choice of insulation. In essence the boards are laid horizontally over the timber across the roof area beginning and ending on a rafter or top chord. In this blog post we explore some of the options available.

If you have a solid floor covering the roof rafters use the claw end of a hammer to pull the floor up in several locations and blow the insulation under the boards. If you want to keep your exposed roof trusses visible then the easiest way to add some insulation is to add it to the exterior side of the finished ceiling. You can use rigid foam panels or do as tom silva does with nearly all houses these days. Replace the floorboards and then spray more insulation on top of it.

If you re considering turning your attic into conditioned storage or living space it s worth changing tactics to insulate between the rafters and wall joists instead of the floor. Place the foam covered side of the insulation board against the roof between the first two rafters with one end against the peak of the roof. Measure the space between the roof rafters. The boards are secured by a screw fixed counter purlin running from eave to roof ridge above each rafter or top chord.

By keeping the insulation on the outside it hides it from viewers while still keeping the insulation trapped inside. Firmly press the board against the underside of the roof. For rolled insulation place it between roof rafters. With a warm roof the usual process is to split the insulation into two layers.