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Underneath the roof sheathing and two exterior layers of rigid foam, the builder stapled netting to the underside of the rafters and filled the roof cavities of the unvented attic with blown-in fiberglass insulation.

Underneath the roof sheathing and two exterior layers of rigid foam, the builder stapled netting to the underside of the rafters and filled the roof cavities of the unvented attic with blown-in fiberglass insulation.
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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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Use a truss joist header assembly as shown here to reduce thermal bridging in hot climate zones.

Use a truss joist header assembly as shown here to reduce thermal bridging in hot climate zones.
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Use staggered 2x4 studs to minimize thermal bridging in hot climate zones.

Use staggered 2x4 studs to minimize thermal bridging in hot climate zones.
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Use this simple calculation to size overhangs above south facing windows.

Use this simple calculation to size overhangs above south facing windows.
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Using outdoor misters or spray fountains can cool the outside air before it enters the house

Using outdoor misters or spray fountains can cool the outside air before it enters the house
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Using roof and wall materials with a high Solar Reflectance Index (SRI) will reduce heat gains.

Using roof and wall materials with a high Solar Reflectance Index (SRI) will reduce heat gains.
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Vented Attic vs Unvented Cathedral Attic Air Flow

Vented Attic vs Unvented Cathedral Attic Air Flow
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Vented roof assembly at eave retrofitted with rigid foam, spray foam, and fully adhered membrane to air seal the top of wall-to-roof transition

Vented roof assembly at eave retrofitted with rigid foam, spray foam, and fully adhered membrane to air seal the top of wall-to-roof transition
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Vented roof assembly at rake retrofitted with spray foam and additional insulation installed at the attic floor and extended to the rake edge

Vented roof assembly at rake retrofitted with spray foam and additional insulation installed at the attic floor and extended to the rake edge
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Vertical trellises and tall shrubs provide very effective shading to the east-facing wall of this home.

Vertical trellises and tall shrubs provide very effective shading to the east-facing wall of this home.
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Vines growing on vertical trellises, along with tall shrubs, provide very effective shade for the east side of this house.

Vines growing on vertical trellises, along with tall shrubs, provide very effective shade for the east side of this house.
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Vinyl and aluminum soffit panels can blow away in high winds if not properly connected.

Vinyl and aluminum soffit panels can blow away in high winds if not properly connected.
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Wall Bracing V: Building Wood Framed Structures for High Wind Resistance

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Wall Bracing: Satisfy the code with strong, resilient, fully sheathed walls

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Wall surfaces having high solar reflectance and high thermal emittance will remain cooler when exposed to direct sunlight.

Wall surfaces having high solar reflectance and high thermal emittance will remain cooler when exposed to direct sunlight.
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Warm air that leaks into the attic through unsealed light fixtures or other bypasses can melt snow on the roof leading to ice dam formation.

Warm air that leaks into the attic through unsealed light fixtures or other bypasses can melt snow on the roof leading to ice dam formation.
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Water management detail for a solar panel rack mounting block installed in rigid foam that was installed over an existing roof

Water management detail for a solar panel rack mounting block installed in rigid foam that was installed over an existing roof
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Water management details at a mechanical curb for a skylight

Water management details at a mechanical curb for a skylight
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Water management details for a roof drain installed along with rigid foam on a flat roof

Water management details for a roof drain installed along with rigid foam on a flat roof
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Water Moisture Issues: Flashing Windows, Water Leaks, and Kick-Out Flashings