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A site-built rafter roof with a raised top plate allows for more insulation underneath.
Flat roof with cavity spray foam plus loose-fill insulation and gypsum board thermal barrier.
Limited attic access may make it necessary to use a bore scope when inspecting for missing air barriers and insulation in existing buildings.
Raised heel energy trusses extend past the exterior wall and are deeper at the wall allowing room for full insulation coverage over the top plate of the exterior walls.
Right-- IR photo shows how effectively spray foam insulated/air sealed attic kneewall and the floor cavities under kneewall
The attic kneewall and the open floor cavities under kneewall are both sealed and insulated in one step with spray foam insulation
The soffit dam and baffle allow air to flow through the vents without disturbing the insulation covering the top plates
This kneewall has no top plate and the resulting gap provides a wide-open pathway for air and vapor to travel between the living space and the attic