Showing results 1 - 100 of 265
Image
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
Image
A floor cavity between the first and second floor can provide a conditioned space for HVAC ducts if the rim joists are insulated and air sealed, if sufficient space is available, and if open-web floor joists are used
Image
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
Image
A simple vented attic with good air-sealing of the drywall ceiling air barrier, air flow from soffit vents to ridge vents protected by ventilation baffles, and lots of insulation covering the attic floor is unlikely to encourage ice dams.
Image
A site-built rafter roof with a raised top plate allows for more insulation underneath.
Image
Image
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.
Image
Above the 20 inches of blown cellulose ultra-efficient attic insulation, Near Zero Maine installed a walkway in the attic to provide easy access to electric wiring.
Image
Adhesive caulk is used to seal seams and attach the multiple layers of rigid insulation
Image
After all holes through the ceiling are air-sealed and the baffles have been installed, then the insulation can be installed.
Image
Image
Image
Air seal floor joist cavities under kneewall with rigid foam, plywood, or OSB caulked in place
Image
Image
Image
Image
Air-Impermeable Insulation for Condensation Control in Unvented Attics, per IRC Table 806.5.
Image
Image
An IR camera image shows gaps around HVAC flue pipes allow conditioned air to leak through blown fiberglass into the attic
Image
An unvented cathedralized attic has the air, thermal, and vapor control layers at the roof line
Image
Attach a strong permanent cover to gable end vents before a severe storm strikes to prevent moisture intrusion.
Image
Image
Image
Attic ventilation fans exhaust hot air from the attic while replacing it with cooler air from the outside through intake vents
Image
Baffles provide an air space over the insulation to guide ventilation air from the soffit vents up along the underside of the roof deck
Image
Image
Image
Batt insulation is installed in two layers in perpendicular directions against the baffle to full required insulation height
Image
Batt insulation is installed in two layers with offset seams against the baffle to full code-required insulation height
Image
Buried ducts are laid on the floor of a vented attic then covered with spray foam and blown attic floor insulation
Image
Image
Image
Clean the attic floor of debris prior to installing new attic insulation. Use baffles to provide a path for ventilation air entering the attic from the soffit vents
Image
Closed-cell spray foam insulation covers the attic floor to provide a continuous air control layer.
Image
Correct air sealing methods for common attic bypass air leakage paths.
Image
Image
Design the roof with raised heel trusses to allow full insulation over the top plates of the exterior walls.
Image
Detail of an unvented cathedralized attic showing air-impermeable spray foam insulation plus batt insulation installed on the underside of the roof deck.
Image
Image
Image
Image
Ducts running parallel to trusses have limited width due to truss spacing
Image
Image
Ductwork located in a vented attic is subject to high attic temperatures and significant heat gain through the walls of the ducts
Image
During high wind events, vortices form along the edges of the roof creating areas of localized negative pressure (“suction”) above the roof
Image
Image
Image
Examples of many common ceiling penetrations that will be difficult to insulate and air seal in this cathedral ceiling.
Image
Failure in attic insulation effectiveness caused by wind washing pushing insulation away from the edges of the attic space.
Image
Flat roof with cavity spray foam plus loose-fill insulation and gypsum board thermal barrier.
Image
Floor cavity air pressure is measured by placing a tube into the floor cavity through a small drilled hole
Image
Floor cavity pressure is measured by inserting a tube into the floor cavity using an extension pole
Image
Image
Image
Framing is sequenced to install an air barrier of OSB, plywood, or rigid foam between the porch and the attic.
Image
Heat loss through the roof of a home in a cold climate zone leads to snow melting to form ice dams.
Image
High-density closed-cell spray foam insulates the attic of this home in New Orleans.
Image
ICF walls and an attic sealed and insulated to R-63 on the underside of the roof deck with 10 inches of open‐cell spray foam plus 2.7 inches of closed‐cell spray foam provide a complete thermal break around this home.
Image
Image
Image
Image
IECC Climate Zone 2A: Unvented Attic with Spray Foam at Roof Deck, 2x6 Wall/CMU Wall, Elevated Slab
Image
IECC Climate Zone 2A: Unvented Attic with Spray Foam at Roof Deck, 2x6 Wall/CMU Wall, Elevated Slab
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
In cathedral ceilings, parallel chord trusses allow thicker insulation levels over the exterior wall top plates.
Image
In the attic, all of the top plate seams are sealed with canned spray foam before covering the ceiling deck with blown fiberglass.
Image
Infrared imaging shows cold conditioned air pouring out of the open floor cavities under this attic kneewall into the hot unconditioned attic
Image
Install a continuous air barrier below or above ceiling insulation and install wind baffles.
Image
Image
Image
Install insulation under platforms constructed in the attic for storage or equipment.
Image
Install wood framing cross pieces in the attic rafter bays on each side of the duct chase
Image
Install wood framing cross pieces in the attic rafter bays on each side of the duct chase
Image
Image
Limited attic access can make inspections for missing air barriers and insulation challenging
Image
Limited attic access may make it necessary to use a bore scope when inspecting for missing air barriers and insulation in existing buildings.
Image
Low-slope roof assemblies constructed of two deck sheathing layers sandwiching rigid foam, and topped with mechanically fastened membrane
Image
Image
Image
Mold on the sheathing in this attic occurred after attic ventilation was increased
Image
Image
One way to air seal and insulate kneewalls – add insulation and a rigid air barrier along roof line of unconditioned attic space outside kneewall
Image
Radiant barrier sheeting can be stapled to the underside of the rafters or along the inside edge of the rafters
Image
Raised ceiling chase sealed with drywall mud
Image
Raised ceiling duct chase installation technique
Image
Raised heel energy trusses extend past the exterior wall and are deeper at the wall allowing room for full insulation coverage over the top plate of the exterior walls.