Roof Blocking On Top Of Rigid

They may extend a short distance beyond the wall to form the eaves and protect the sides of the building.

Roof blocking on top of rigid.

Then on top of the rigid thermal insulation there should be a coverboard. Note that there was no air seal at this location originally. I resided 17 years ago over one layer of continuous rigid insulation. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers.

Align the insulation boards with the chalk lines and lay them onto the deck. Install one or two layers of tongue and groove osb or plywood on top of the rigid foam. Apply a new roof deck over the 2x4s and dry in with roofing felt or impermeable synthetic roofing underlayment. The three layers of rigid insulation have yet to be installed over the top of the roof decking at this point.

Ladder style blocking provides the structure of a torsion box which ties the fascia soffit. This coverboard is also screwed down to the metal deck. Rafters are nailed to the plate not framed into it. Rafters rest on the top wall plate.

And roof overhang together into a beam. This air seal is pretty darn good. This type of insulated roof assembly limits thermal bridging through rafters. Install nailbase for cladding.

Stagger the joints to. 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. Butt the ends of the boards up together. After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam.

I have to come clean here as well. This insulation should be screwed down to the metal 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. 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. This is the method a friend and i did in his basement. Rigid thermal insulation on the top of this air control layer in two layers at least with the joints off set horizontally and vertically. Make sure there is sufficient soffit venting.