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Top view showing how the chimney is attached to at least four ceiling joists running parallel to the exterior wall.

Top view showing how the chimney is attached to at least four ceiling joists running parallel to the exterior wall.
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Top view showing how the chimney is attached to ceiling joists that run perpendicular to the exterior wall.

Top view showing how the chimney is attached to ceiling joists that run perpendicular to the exterior wall.
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Tornado, Hurricane, and Earthquake Risk Profile of 379 U.S. Urban Areas

Tornado, Hurricane, and Earthquake Risk Profile of 379 U.S. Urban Areas
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Transfer grill sealed with mastic

Transfer grill sealed with mastic
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Transfer grille not sealed

Transfer grille not sealed
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Turn valve clockwise from vertical (aligned with piping) to horizontal (perpendicular to piping) to shut off gas

Turn valve clockwise from vertical (aligned with piping) to horizontal (perpendicular to piping) to shut off gas
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Twisting and compressing flex duct will block air flow

Twisting and compressing flex duct will block air flow
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Two L-brackets or seismic snubbers are installed at each corner of the HVAC unit and a vibration isolator or spring mount is installed in each corner to anchor the unit while allowing for slight movement in an earthquake

Two L-brackets or seismic snubbers are installed at each corner of the HVAC unit and a vibration isolator or spring mount is installed in each corner to anchor the unit while allowing for slight movement in an earthquake
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Types of brackets recommended for use in securing cabinets and drawers to the wall of the home.

Types of brackets recommended for use in securing cabinets and drawers to the wall of the home.
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Types of heat pump water heaters commonly used in central heat pump water heating systems include single pass units, multi pass units, and integrated units

Types of heat pump water heaters commonly used in central heat pump water heating systems include single pass units, multi pass units, and integrated units
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Typical roof truss top chord bracing

Typical roof truss top chord bracing
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Underwriters Laboratory label for a safe room door.

Underwriters Laboratory label for a safe room door.
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Unfaced fiberglass batt insulation is installed to completely fill the wall cavities and is sliced to fit around wiring, piping, and other obstructions in the wall cavities

Unfaced fiberglass batt insulation is installed to completely fill the wall cavities and is sliced to fit around wiring, piping, and other obstructions in the wall cavities
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Unvented Attic Insulation (1)

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Unvented concrete masonry unit crawl space with exterior insulation - designed for termite resistance in moderately infested areas

Unvented concrete masonry unit crawl space with exterior insulation - designed for termite resistance in moderately infested areas
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Unvented roof assembly at eave retrofitted with rigid foam, spray foam, and a fully adhered membrane seal at the top of wall-to-roof transition

Unvented roof assembly at eave retrofitted with rigid foam, spray foam, and a fully adhered membrane seal at the top of wall-to-roof transition
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Unvented roof assembly at eave retrofitted with rigid foam, spray foam, and taped top edge of existing house wrap or building paper

Unvented roof assembly at eave retrofitted with rigid foam, spray foam, and taped top edge of existing house wrap or building paper
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Unvented roof assembly at rake retrofitted with a filler piece and taped top edge of existing house wrap or building paper to seal the top of wall-to-roof transition

Unvented roof assembly at rake retrofitted with a filler piece and taped top edge of existing house wrap or building paper to seal the top of wall-to-roof transition
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Unvented roof assembly at rake retrofitted with spray foam installed along the underside of the roof deck and extended to the rake edge to insulate and air seal the attic

Unvented roof assembly at rake retrofitted with spray foam installed along the underside of the roof deck and extended to the rake edge to insulate and air seal the attic
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Upper wall insulation installation

Upper wall insulation installation
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Upper wall insulation installation with butyl z-flashing

Upper wall insulation installation with butyl z-flashing
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Use flexible straps to secure large electronics equipment like computer monitors and microwave ovens during seismic events.

Use flexible straps to secure large electronics equipment like computer monitors and microwave ovens during seismic events.
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Use plumbers metal strapping, wood blocking, and shelving brackets to secure a water heater in a corner to prevent tipping during an earthquake.

Use plumbers metal strapping, wood blocking, and shelving brackets to secure a water heater in a corner to prevent tipping during an earthquake.
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Use strapping, wood blocking, and shelving brackets to secure a water heater to a straight wall to prevent tipping during an earthquake.

Use strapping, wood blocking, and shelving brackets to secure a water heater to a straight wall to prevent tipping during an earthquake.