Roof Blocking On Top Of Rigid

The plywood was fastened through the rigid foam to the rafters with long screws.

Roof blocking on top of rigid.

And roof overhang together into a beam. Rafters are nailed to the plate not framed into it. Some are cut to fit the plate while in hasty construction they are merely laid on top of the plate and nailed in place. This air seal is pretty darn good.

Note that there was no air seal at this location originally. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. 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.

The type of roof. After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam. Install nailbase for cladding. Stagger the joints to.

They may extend a short distance beyond the wall to form the eaves and protect the sides of the building. This coverboard is also screwed down to the metal deck. Rafters rest on the top wall plate. This is the method a friend and i did in his basement.

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 insulation should be screwed down to the metal deck. Use a chalk box to snap chalk lines on the roof deck. Rigid thermal insulation on the top of this air control layer in two layers at least with the joints off set horizontally and vertically.

Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance. Ladder style blocking provides the structure of a torsion box which ties the fascia soffit. Then on top of the rigid thermal insulation there should be a coverboard. Make sure there is sufficient soffit venting.

I have to come clean here as well. 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. This type of insulated roof assembly limits thermal bridging through rafters.