Insulating Tongue And Groove Roof

Owens corning foamular 250 2 in.

Insulating tongue and groove roof.

Owens corning foamular tongue and groove r 10 insulation sheathing is designed for resisting moisture and to block mildew. Styrofoam brand tongue and groove extruded polystyrene foam insulation xps features tongue and groove edges on all four sides of 2 x 8 boards 1 thick or less and on the long edges of all other boards. This is often a layer of tongue and groove boards nailed to the exterior side of the exposed rafters. The eps panels attach to the roof structure with long spikes.

Inside you see the boards and shingles are on the outside. The overall panel thickness varies depending on the desired r value. What s the best way to insulate over an exposed 2x6 tongue and groove cathedral ceiling on a log house in colorado. Such is the case with my house picture above it is a 1958 custom built a frame with 6 12 timbers and 2 6 tongue and groove roof boards.

Install a 6 mil polyethylene vapor retarder over the tongue and groove roof planks. Some have suggested using sips but others have advised that because this particular roof is cut up with valleys and dormers i would lose the labor savings associated with sips and end up with a very expensive roof. The insulation for exposed rafters is installed on the exterior side of the finish ceiling. R 10 tongue and groove rigid foam board insulation sheathing 24dd the home depot.

Another suggestion was to box out the roof with 2 bys. You can then roof over the osb surface with any conventional sloped roof application.