Showing results 1 - 35 of 35
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A floor cavity between the first and second floor can provide a conditioned space for HVAC ducts if the rim joists are insulated and air sealed, if sufficient space is available, and if open-web floor joists are used
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Buried ducts are laid on the floor of a vented attic then covered with spray foam and blown attic floor insulation
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Ducts running parallel to trusses have limited width due to truss spacing
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Ductwork located in a vented attic is subject to high attic temperatures and significant heat gain through the walls of the ducts
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Install wood framing cross pieces in the attic rafter bays on each side of the duct chase
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Raised ceiling chase sealed with drywall mud
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Right - Open-cell polyurethane spray foam to R-28 on underside of roof turns new attic into conditioned space for HVAC.
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Right- This flue pipe has been air sealed with sheet metal and fire-rated caulk and an insulation dam has been constructed to keep insulation from touching the hot flue pipe
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Right: Ducts are completely buried beneath insulation to the depth specified in the plans
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Right: ductwork is fully encapsulated with ccSPF prior to ceiling installation and burial
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Right: Ductwork is installed in direct contact with lower truss cords. In this picture the main trunk is laying on the truss cords and branch ducts are temporarily held with strapping across truss cords. Ducts are well sealed with mastic
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Second layer of rigid insulation is adhered with foam
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Spray foam insulation used for raised ceiling duct chase
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Spray foam insulation used for raised ceiling duct chase.
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Standard 2 in. by 4 in. stud secures duct chase - made of rigid insulation in this example
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The attic duct chase insulated and sealed to the attic floor with spray foam
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The drywall above the dropped ceiling duct chase extends beyond adjoining top plates for a continuous air barrier
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Wrong - Not enough straps were used to hang this flex duct so it is sagging, restricting air flow
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Wrong: Ducts are held above the ceiling plane with strapping to provide a good angle into top-entry boots. Once the ceiling insulation is added, this duct will protrude from the ceiling insulation and will not be buried
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Wrong: Ducts are held from the rafters with strapping and a large beam prevents ducts from properly lying on the ceiling plane
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Wrong: Ducts are not laid across the lower truss cords or ceiling, but are hung from the rafters by straps. As a result, ductwork is not buried
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Wrong: Ductwork is not fully encapsulated with ccSPF insulation. The duct jacket is still fully visible at sections of the duct
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Wrong: open wall cavity connected to this return air plenum is allowing cellulose attic insulation to be pulled into the furnace
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Wrong: This wall cavity is open to the attic allowing unconditioned, attic air to enter the HVAC system, bypassing the filter, and degrading system life and performance