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A Cup of Joe: Below Grade Water Control | Building Science Deconstructed

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A damp crawlspace

A damp crawlspace
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A deck or other attached structure located at the top of a slope with vegetation underneath is at high risk of ignition during a wildfire

A deck or other attached structure located at the top of a slope with vegetation underneath is at high risk of ignition during a wildfire
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A demand plumbing layout uses a recirculation pump to speed delivery of hot water to plumbing fixtures.

A demand plumbing layout uses a recirculation pump to speed delivery of hot water to plumbing fixtures.
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A dense concentration of buildings and pavement can create the Urban Heat Island Effect, where local temperatures can be several degrees higher than the surrounding areas

A dense concentration of buildings and pavement can create the Urban Heat Island Effect, where local temperatures can be several degrees higher than the surrounding areas
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A detached garage offers more space to place solar panels with likely fewer roof penetrations and more options for roof pitch and orientation.

A detached garage offers more space to place solar panels with likely fewer roof penetrations and more options for roof pitch and orientation.
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A detergent port on a steel boiler

A detergent port on a steel boiler
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A developer meets with a landscape architect at the site.

A developer meets with a landscape architect at the site.
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A dimpled plastic water barrier protects the insulated concrete form basement walls and carries any ground water down the walls to the footing drain to minimize the opportunity for water intrusion and frost heave.

A dimpled plastic water barrier protects the insulated concrete form basement walls and carries any ground water down the walls to the footing drain to minimize the opportunity for water intrusion and frost heave.
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A dimpled rain mat and perforated drain pipe provide drainage around the basement foundation.

A dimpled rain mat and perforated drain pipe provide drainage around the basement foundation.
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A direct-vent sealed-combustion fireplace takes its combustion air directly from outside through a dedicated air inlet and vents combustion products directly outside

A direct-vent sealed-combustion fireplace takes its combustion air directly from outside through a dedicated air inlet and vents combustion products directly outside
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A direct-vent sealed-combustion furnace has dedicated pipes for combustion air and exhaust

A direct-vent sealed-combustion furnace has dedicated pipes for combustion air and exhaust
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A dormer with an openable window (not shown) can provide access to the roof if flood waters rise too high and too quickly; the dormer should be properly insulated, flashed, and air sealed

A dormer with an openable window (not shown) can provide access to the roof if flood waters rise too high and too quickly; the dormer should be properly insulated, flashed, and air sealed
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A double layer of hat channels installed at 90-degrees to each other with stainless-steel screws through the rigid foam to anchor cladding to steel studs with less thermal transfer; the second layer of hat channels provides increased rigidity

A double layer of hat channels installed at 90-degrees to each other with stainless-steel screws through the rigid foam to anchor cladding to steel studs with less thermal transfer; the second layer of hat channels provides increased rigidity
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A drainage plane is created behind lap siding by installing furring strips on the exterior walls over house wrap which is overlapped and taped at all seams to serve as an air and water barrier.

A drainage plane is created behind lap siding by installing furring strips on the exterior walls over house wrap which is overlapped and taped at all seams to serve as an air and water barrier.
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A dry hydrant is a pipe a homeowner can have installed in a natural water source on their rural property to provide easy access to the water by firefighting crews.

A dry hydrant is a pipe a homeowner can have installed in a natural water source on their rural property to provide easy access to the water by firefighting crews.
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A drywell, shown here used for downspout catchment, can also be used to receive water from a French drain.

A drywell, shown here used for downspout catchment, can also be used to receive water from a French drain.
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A duct leakage test is performed on a ducted heat pump system using a duct tester (blower fan) and a digital manometer.

A duct leakage test is performed on a ducted heat pump system using a duct tester (blower fan) and a digital manometer.
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A duct test fan is set up for whole duct system testing with attachment to the central duct system inside the ERV cabinet

A duct test fan is set up for whole duct system testing with attachment to the central duct system inside the ERV cabinet
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A duct test fan is set up in an access door of a roof top central ventilation unit using a blower door tarp and blower door frame; this is just one of several ways that this type of test can be set up

A duct test fan is set up in an access door of a roof top central ventilation unit using a blower door tarp and blower door frame; this is just one of several ways that this type of test can be set up
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A duct testing fan is attached to an open horizontal branch of a central exhaust system using flex duct which is part of the duct testing fan’s kit; this test is at rough-in and is being performed on a portion of the total duct system

A duct testing fan is attached to an open horizontal branch of a central exhaust system using flex duct which is part of the duct testing fan’s kit; this test is at rough-in and is being performed on a portion of the total duct system
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A ducted central return brings air from central return registers back to the air handler through insulated, air-sealed ducts

A ducted central return brings air from central return registers back to the air handler through insulated, air-sealed ducts
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A ducted minisplit heat pump is hidden in the ceiling of this centrally located room with short duct runs to the registers located on each wall of the room.

A ducted minisplit heat pump is hidden in the ceiling of this centrally located room with short duct runs to the registers located on each wall of the room.
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A ductless heat pump is hidden behind a wall outcropping above the hallway ceiling.

A ductless heat pump is hidden behind a wall outcropping above the hallway ceiling.