Insulate A Roof Without Sheathing

By leaving an air space between the insulation and the sheathing we can have air flow over the framing.

Insulate a roof without sheathing.

The old insulation barely filled half of the stud cavity depth. The solution is not to ignore the insulation but to add one component. Over roof insulation the gable overhang has been cut flush with the wall sheathing. With this kind of roof the insulation follows the slope of the roof.

If there is a leak the air flow ventilation will help dry out the moisture. As with attic floor insulation moisture and heat removal are the reasons for creating proper air. This ventilation offers another benefit. For diy attic insulation you ve got two choices.

However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. Featuring integrated moisture air and thermal protection zip system r sheathing completely reimagines traditional wall assemblies by streamlining exterior water air and thermal management. 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. For such constructions the principles and benefits of unvented attic construction are similar to that occurring in a single family residence.

We did new unfaced batt insulation sheathing wrb and exterior rigid xps foam insulation with a lot of attention to air sealing. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. 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. Polyurethane foam has the added benefit of sealing air leaks but you shouldn t consider installing it directly against the back of the siding.

Loose fill or batt the common term for blanket insulation. A roof over a vented unconditioned attic does not need to include any insulation. Insulated roof assemblies can be vented or unvented. Both can be added to uninsulated attics or layered over existing material.

Zip system r sheathing is the simple all in one structural panel with built in exterior insulation.