25 Jun '14, 9am

What Architects Need to Know About Attic Kneewalls

What Architects Need to Know About Attic Kneewalls

Vaulted ceiling. Although there is a line, the designer has not called out that there should be blocking at the base of the insulation in the vaulted ceiling. Fiberglass, the insulation usually installed here, is air permeable, so ventilation air is as likely to flow through the insulation as above the baffle. Attic kneewall sheathing Material, usually plywood or oriented strand board (OSB), but sometimes wooden boards, installed on the exterior of wall studs, rafters, or roof trusses; siding or roofing installed on the sheathing—sometimes over strapping to create a rainscreen. . Without sheathing on the attic-side of the kneewall, hot (or cold) attic air can get into the air-permeable fiberglass insulation most often used here. Even worse, the fiberglass batts often fall out, as shown in the photo below. Attic kneewall insulation. The section above calls for R-19 insulati...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/building-s...

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