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When installing piping and wiring, do not block access to the filter

When installing piping and wiring, do not block access to the filter
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When looking for plumbing pipes to find floor penetrations, remember that plumbing pipe may consist of several different materials, such as PEX (white pipes on left), copper (right), plastic, or insulated with foam (gray, far right).

When looking for plumbing pipes to find floor penetrations, remember that plumbing pipe may consist of several different materials, such as PEX (white pipes on left), copper (right), plastic, or insulated with foam (gray, far right).
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When wrapping metal ducts with insulation allow two inches of overlap and staple along the seam with outward clinching staples

When wrapping metal ducts with insulation allow two inches of overlap and staple along the seam with outward clinching staples
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Whole house ventilation ensures adequate indoor air quality

Whole house ventilation ensures adequate indoor air quality
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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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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 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.
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Wrap batt insulation around pipe loosely enough not to compress the insulation and secure with wire or tape

Wrap batt insulation around pipe loosely enough not to compress the insulation and secure with wire or tape
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Wrap the insulation around the pipe in a spiral fashion

Wrap the insulation around the pipe in a spiral fashion
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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 - Cardboard should be removed from under toilet base.

Wrong - Cardboard should be removed from under toilet base.
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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 - Condensate pipe is draining onto basement floor.

Wrong - Condensate pipe is draining onto basement floor.
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Wrong - Copper pipe is crimped by the support staple.

Wrong - Copper pipe is crimped by the support staple.
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Wrong - Copper pipe was damaged during installation.

Wrong - Copper pipe was damaged during installation.
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Wrong - Craft faced batt insulation is compressed behind PEX pipe instead of being sliced to fit around it.

Wrong - Craft faced batt insulation is compressed behind PEX pipe instead of being sliced to fit around it.
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Wrong - Craft faced batt insulation is not cut to fit around PEX plumbing pipe.

Wrong - Craft faced batt insulation is not cut to fit around PEX plumbing pipe.
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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 - Exterior drain pipe is exposed and thus subject to being crushed; also it has been allowed to fill with dirt and may be clogged, preventing perimeter drain pipe or downspouts from draining.

Wrong - Exterior drain pipe is exposed and thus subject to being crushed; also it has been allowed to fill with dirt and may be clogged, preventing perimeter drain pipe or downspouts from draining.