Roof Blocking On Top Of Rigid

I resided 17 years ago over one layer of continuous rigid insulation.

Roof blocking on top of rigid.

Ladder style blocking provides the structure of a torsion box which ties the fascia soffit. Rafters are nailed to the plate not framed into it. They may extend a short distance beyond the wall to form the eaves and protect the sides of the building. And roof overhang together into a beam.

This air seal is pretty darn good. Rafters rest on the top wall plate. I have to come clean here as well. Install nailbase for cladding.

The plywood was fastened through the rigid foam to the rafters with long screws. Butt the ends of the boards up together. This coverboard is also screwed down to the metal deck. Some are cut to fit the plate while in hasty construction they are merely laid on top of the plate and nailed in place.

Stagger the joints to. Install one or two layers of tongue and groove osb or plywood on top of the rigid foam. This insulation should be screwed down to the metal deck. The type of roof.

Align the insulation boards with the chalk lines and lay them onto the deck. If you install just one layer you ll need to fasten the osb or plywood to the concrete slab with long tapcon screws that extend through the rigid foam. This is the method a friend and i did in his basement. Note that there was no air seal at this location originally.

Use a chalk box to snap chalk lines on the roof deck. Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. Then on top of the rigid thermal insulation there should be a coverboard.

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. This type of insulated roof assembly limits thermal bridging through rafters. Apply a new roof deck over the 2x4s and dry in with roofing felt or impermeable synthetic roofing underlayment. Make sure there is sufficient soffit venting.