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Image:

Wide saddle support provides sturdy support for the turn without pinching the flex duct

Wide saddle support provides sturdy support for the turn without pinching the flex duct
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Wind-Damage Reduction as a Function of Retrofit Level

Wind-Damage Reduction as a Function of Retrofit Level
CAD File:

Window head at window frame wall

Preview Image
Window head at window frame wall
CAD File:

Window head at wood frame wall

Preview Image
Window head at wood frame wall
CAD File:

Window sill at wood frame wall

Preview Image
Window sill at wood frame wall
CAD File:

Window sill at wood frame wall

Preview Image
Window sill at wood frame wall
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With exhaust-only ventilation, the building is under negative pressure

With exhaust-only ventilation, the building is under negative pressure
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With supply-only ventilation, the building is under positive pressure

With supply-only ventilation, the building is under positive pressure
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With the nailed block method, wood blocks are attached to the sill plate and the cripple wall plywood is attached to the block to provide shear strength for correctly bracing a cripple wall in a seismic retrofit

With the nailed block method, wood blocks are attached to the sill plate and the cripple wall plywood is attached to the block to provide shear strength for correctly bracing a cripple wall in a seismic retrofit
Image:

With the register grill removed, very large gaps are visible around the edges of this duct boot between the duct boot and the drywall; the gaps can be closed with screw or heavy staples then sealed with caulk, mastic, or metal tape.

With the register grill removed, very large gaps are visible around the edges of this duct boot between the duct boot and the drywall; the gaps can be closed with screw or heavy staples then sealed with caulk, mastic, or metal tape.
Case Study:

WPPI GreenMax-Chambers Residence: Near Zero Energy Monitoring Summary

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Wrong - Air conditioning compressor unit should be sitting on concrete pad installed directly on ground.

Wrong - Air conditioning compressor unit should be sitting on concrete pad installed directly on ground.
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Wrong - Air filter was compressed and may not function effectively to filter return air.

Wrong - Air filter was compressed and may not function effectively to filter return air.
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Wrong - Ceiling HVAC register is improperly installed on an angled ceiling.

Wrong - Ceiling HVAC register is improperly installed on an angled ceiling.
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Wrong - Duct insulation and vapor barrier do not cover all of the flex duct.

Wrong - Duct insulation and vapor barrier do not cover all of the flex duct.
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Wrong - Duct juncture seam should be sealed with metal tape or mastic.

Wrong - Duct juncture seam should be sealed with metal tape or mastic.
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Wrong - Duct seams were sealed with regular duct tape which has failed to hold; seams should have been sealed with mastic or approved metal tape.

Wrong - Duct seams were sealed with regular duct tape which has failed to hold; seams should have been sealed with mastic or approved metal tape.
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Wrong - Duct-duct joint is not sealed.

Wrong - Duct-duct joint is not sealed.
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Wrong - Flex duct insulation is overly compressed in 3 ways; Zip-tie fastener is over the insualtion not under the insulation at the duct boot collar, duct turning radius is too tight, and support strap is too tight.

Wrong - Flex duct insulation is overly compressed in 3 ways; Zip-tie fastener is over the insualtion not under the insulation at the duct boot collar, duct turning radius is too tight, and support strap is too tight.
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Wrong - Flex duct is improperly attached and sealed to duct boot.

Wrong - Flex duct is improperly attached and sealed to duct boot.
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Wrong - Flex duct pinched by bracing

Wrong - Flex duct pinched by bracing
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Wrong - Flex duct resting on floor compressing insulation and causing condensation

Wrong - Flex duct resting on floor compressing insulation and causing condensation
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Wrong - Flex duct with sharp turn restricting air flow

Wrong - Flex duct with sharp turn restricting air flow
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Wrong - Furnace return air filter is dirty and needs to be replaced.

Wrong - Furnace return air filter is dirty and needs to be replaced.