Roof Blocking On Top Of Rigid

Install one or two layers of tongue and groove osb or plywood on top of the rigid foam.

Roof blocking on top of rigid.

Install nailbase for cladding. Rigid thermal insulation on the top of this air control layer in two layers at least with the joints off set horizontally and vertically. Butt the ends of the boards up together. When we do complex roofs in high snow load areas like ski resorts we typically have the roof deck act as the air control layer and provide a high level of thermal resistance at the roof deck either rigid insulation directly above the roof deck or high density spray foam directly under the roof deck and then we provide an over roof creating a vented space over the top of the entire assembly.

I resided 17 years ago over one layer of continuous rigid insulation. Rafters rest on the top wall plate. They may extend a short distance beyond the wall to form the eaves and protect the sides of the building. Then on top of the rigid thermal insulation there should be a coverboard.

Note that there was no air seal at this location originally. Make sure there is sufficient soffit venting. Apply a new roof deck over the 2x4s and dry in with roofing felt or impermeable synthetic roofing underlayment. Some are cut to fit the plate while in hasty construction they are merely laid on top of the plate and nailed in place.

The plywood was fastened through the rigid foam to the rafters with long screws. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. This coverboard is also screwed down to the metal deck. This is the method a friend and i did in his basement.

This insulation should be screwed down to the metal deck. I have to come clean here as well. Stagger the joints to. Ladder style blocking provides the structure of a torsion box which ties the fascia soffit.

This air seal is pretty darn good. The type of roof. This type of insulated roof assembly limits thermal bridging through rafters. Align the insulation boards with the chalk lines and lay them onto the deck.

After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam. Rafters are nailed to the plate not framed into it. Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance. Use a chalk box to snap chalk lines on the roof deck.