Insulate A Roof Without Sheathing

Both can be added to uninsulated attics or layered over existing material.

Insulate a roof without sheathing.

Also note that a new fully adhered membrane is installed on the original roof deck replacing the one installed 17 years ago is folded down to catch the top edge of the wall water control layer. By leaving an air space between the insulation and the sheathing we can have air flow over the framing. If there is a leak the air flow ventilation will help dry out the moisture. Loose fill or batt the common term for blanket insulation.

The new walls came in with an r value just under 30. Baffles establish a channel for air to circulate between the insulation and the roof sheathing. Over roof insulation the gable overhang has been cut flush with the wall sheathing. As with attic floor insulation moisture and heat removal are the reasons for creating proper air.

A roof over a vented unconditioned attic does not need to include any insulation. But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used. Using spray foam insulation a second option for insulating a wall with no sheathing is to use spray foam. However most cathedral ceilings and low slope flat roofs are insulated roof assemblies.

This ventilation offers another benefit. The solution is not to ignore the insulation but to add one component. Featuring integrated moisture air and thermal protection zip system r sheathing completely reimagines traditional wall assemblies by streamlining exterior water air and thermal management. Once you ve decided which type is best for you examine the material options and prices to home in on the right product.

Zip system r sheathing is the simple all in one structural panel with built in exterior insulation. Polyurethane foam has the added benefit of sealing air leaks but you shouldn t consider installing it directly against the back of the siding. With this kind of roof the insulation follows the slope of the roof. The old insulation barely filled half of the stud cavity depth.

Insulated roof assemblies can be vented or unvented.