Vented Or Non Vented Attic

The eaves will extend 12 from the rough framed walls.

Vented or non vented attic.

A vented attic system refers specifically to having working vents in the attic. Either of these systems comes with a premium cost typically two to three times the price of a blown fiberglass or cellulose vented attic assembly. Fill with spray foam after installing non vented lp smartside soffits fascia etc. My question is how should the eave space be treated.

Those vents in the attic allow for airflow and that airflow moves the hot air and moisture out of the attic. A sealed non vented airtight attic. Our new home design will have a non vented attic space with the underside of the roof deck between rafters insulated with r 50 closed cell foam. While both vented and unventilated attics are permitted in both the ibc ibc 1203 3 2 and irc r806 4 a should the wood panels get wet they may not be able to dry out and buckling or loss of structural integrity may result.

Both vented and unvented attic roof designs can be used in all hygro thermal regions. This facilitates the design of unvented attics in warm and mixed climates without an additional vapor retarder but requires an additional vapor retarder element in colder regions. What is more significant to note is that the color of shingles and roof orientation have a more profound effect on the durability of shingles than the choice of venting or not venting double or triple the effect of venting non venting. An insulation contractor advises me to eliminate the planned roof soffit vents and seal the attic with foam.