Showing results 1 - 48 of 48
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A 1- and ½-story home with a room located in the attic and the thermal boundary located at either a) the walls and ceiling of the attic room with small vented attic spaces or b) the roof line for an unvented attic
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A low-sloped shed roof with the thermal boundary located at either a) the flat ceiling with a vented attic or b) the roof line for an unvented attic
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A typical Las Vegas hot-dry climate home made of wood frame construction and insulated with R-25 expanded polystyrene externally over a drainage plane, with an unvented wood frame insulated attic and roof assembly.
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Air-Impermeable Insulation for Condensation Control in Unvented Attics, per IRC Table 806.5.
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Correct air sealing methods for common attic bypass air leakage paths.
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Detail of an unvented cathedralized attic showing air-impermeable spray foam insulation plus batt insulation installed on the underside of the roof deck.
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During high wind events, vortices form along the edges of the roof creating areas of localized negative pressure (“suction”) above the roof
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Examples of many common ceiling penetrations that will be difficult to insulate and air seal in this cathedral ceiling.
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Flat roof with cavity spray foam plus loose-fill insulation and gypsum board thermal barrier.
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Heat loss through the roof of a home in a cold climate zone leads to snow melting to form ice dams.
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Low-slope roof assemblies constructed of two deck sheathing layers sandwiching rigid foam, and topped with mechanically fastened membrane
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Right - An unvented attic with no soffit vents, borate-treated fascia board, metal drip edge, and concrete block construction on this south Florida home help make it resistant to hurricanes, pests, and wind-born wildfire embers.
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Right - Continuous wall sheathing and blocking has been installed to brace the raised heel trusses.
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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 - Spray foam insulation has been sprayed onto the underside of the sloped roof and the gable end wall to provide a sealed, insulated attic for housing the HVAC ducts
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Right - These raised heel roof trusses provide 16 inches of space over the outer walls for full insulation coverage at the attic perimeter.
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Right - This new sealed attic has 5.5 inches (R-20) of spray foam insulation along the underside of the roof deck providing a conditioned attic space for the heating and cooling ducts.
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Right – Closed-cell polyurethane foam is sprayed on the underside of the roof deck to provide structural connections and seal seams in the sheathing to increase wind resistance
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Right – Roof underlayment is fully adhered and roof deck seams are sealed so roof is resistant to high-wind events
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Right – Roof underlayment is fully adhered and roof deck seams are sealed so roof is resistant to high-wind events
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Right – Sheathing extends to rafters adding strength to soffit, baffles keep attic insulation from vent to maintain air flow
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Sloped roof with cavity spray foam insulation sprayed on underside of roof deck and covered with sprayed-on thermal or ignition barrier coating.
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Sloped roof with cavity spray foam insulation, strapping, and gypsum board thermal barrier
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Spray foam insulation was installed on the underside of the roof deck and on gable end attic walls to create an unvented attic
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The green framing is lumber that was pressure treated with borate to increase its resistance to termites, mold, and moisture
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The polyethylene ceiling vapor barrier is sealed to form an air barrier around the exhaust fan in this very cold climate location (≥ CZ 6).
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The soffit dam and baffle allow air to flow through the vents without disturbing the insulation covering the top plates
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The thermal boundary for a gable roof can be located at either a) the flat ceiling with a vented attic or b) the roof line for an unvented attic
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The ventilation space in this vented over-roof keeps the roof cool to prevent ice dams over the unvented attic
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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
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Wrong – Gable end vents can circumvent soffit-to-ridge airflow and allow in wind-driven rain and wildfire embers
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Wrong – Roof underlayment is not fully adhered and roof deck seams are not sealed so roof is susceptible to high-wind events
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Wrong – The open overhang with exposed timbers and unscreened vent holes make this roof more susceptible to ignition.
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Wrong – The roof sheathing was inadequately fastened and gave way causing the gable end wall to fail
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Wrong – This gable end wall failed because connectors were missing at points of support (blue circles) and the outlookers were not connected to the end truss (yellow circle)
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Wrong – This house under construction is lacking wall to truss bracing and the bottom chord of the scissor trusses is several feet above the top of the end wall top plate
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Wrong – Wind-driven rain and wildfire embers can enter an attic through the soffit vents.
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Wrong: Closed-cell spray foam roof insulation was not thick enough to meet IRC levels so the foam surface is colder than the dew point of the interior air and condensation formed on surface of the foam