Rigid Top Roof Sheathing

We live in zone 5 suburb of chicago and are hopefully about to put rigid foam above the roof sheathing on just the northeast roof portion of our roof.

Rigid top roof sheathing.

The illustration shows two layers of osb or plywood roof sheathing. Remove existing roofing and non adhered underlayment to expose roof sheathing. Deck for a thick roof rigid foam insulation installed above the roof assembly can create an energy smart roof. My original plan was to install the layer of rigid foam first and then do the sheathing on top.

Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. A lower layer conventionally nailed to the rafters and an upper layer installed as a nailing surface for the roofing material on top of the rigid foam. 4 of polyiso under 4 of eps all above the original roof sheathing. The glue i was using didn t set fast enough to hold the rigid foam panels in place so i ended up installing the foam and osb sheathing at the same time.

Of cellulose insulation in the rafter cavities the roof shown here has an r value of approximately 63. Many homes in more urban areas or other places with dense populations are opting for this method because they can better optimize space. Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. Benefits of rigid foam on top of sheathing.

Installing the rigid foam and top layer of roof sheathing. Tiles were designed so that lugs or short protrusions on the top backside of each tile would hook over the step sheathing. Installing rigid foam insulation on top of roof sheathing is a great option for commercial buildings and homes with limited space. More recently however most roofers recommend solid sheathing on the roof to give the house additional resistance to movement or shear strength.

Only thing is it was windy that day. Then a second layer of plywood sheathing and asphalt shingles following the steps explained in this article.