Clothes Dryer Exhaust Like ducts for exhaust fans, dryer exhaust ducts located in attics must vent to the outdoors and comply with these requirements. Dryer exhaust ducts that pass through attics must be vented to the outdoors, sealed to prevent exhaust air from entering the building, have a back-draft damper, and terminate in a vent cap. New dryer ducts must be rigid metal, securely connected with mechanical fasteners, permanently supported, and sized according to the specifications. To prevent blockage with manufacturer’s lint, connect new dryer vent ducts with screws. Instead, use a metal clamp or UL-rated foil don’t tape to secure dryer duct connections. Exhaust systems must comply with local code and manufacturer specifications, not exceed 25 feet, be as straight as practical, and sloped downward to allow condensate toward the termination fitting to drain. Attic Insulation: Installation Blown Attic Insulation Install loose-fill insulation to the surface between the conditioned space and attic with a uniform R-value. Comply with these steps when installing loose-fill attic insulation. Install one insulation depth ruler for every 300 square feet of attic area. Depth rulers should face the attic entrance. Pack insulation against the eave baffle or roof deck to achieve the highest possible R-value in places where the full intended thickness of insulation fit. won’t Install insulation to a consistent depth. Level the insulation if necessary. Batt-Type Insulation Install batts in contact with the surface between the conditioned space and attic, cut to fit, placed tightly together with no gaps except those required for clearance around heat-producing fixtures. Install baffles and shields prior to installing batt-type insulation. Cover the exterior of the top plates of exterior walls. You may compress the batts at the eaves if necessary to cover the top plates. Foam Insulation In an open attic, a sloped roof cavity, or an attic knee wall, both spray or rigid foam are acceptable types of insulation, provided they meet the following requirements. The foam insulation must meet the minimum requirements for R-value. Contractors must install the foam insulation in contact with the surface that separates attic and conditioned space. The foam insulation must comply with thermal-barrier and ignition-barrier code requirements for as defined by the local building code or allowed by local building officials. “foam plastics,”
Clothes Dryer Exhaust Like ducts for exhaust fans, dryer exhaust ducts located in attics must vent to the outdoors and comply with these requirements. Dryer exhaust ducts that pass through attics must be vented to the outdoors, sealed to prevent exhaust air from entering the building, have a back-draft damper, and terminate in a vent cap. New dryer ducts must be rigid metal, securely connected with mechanical fasteners, permanently supported, and sized according to the manufacturer’s specifications. To prevent blockage with lint, don’t connect new dryer vent ducts with screws. Instead, use a metal clamp or UL-rated foil tape to secure dryer duct connections. Exhaust systems must comply with local code and manufacturer specifications, not exceed 25 feet, be as straight as practical, and sloped downward to allow condensate toward the termination fitting to drain. Attic Insulation: Installation Blown Attic Insulation Install loose-fill insulation to the surface between the conditioned space and attic with a uniform R-value. Comply with these steps when installing loose-fill attic insulation. Install one insulation depth ruler for every 300 square feet of attic area. Depth rulers should face the attic entrance. Pack insulation against the eave baffle or roof deck to achieve the highest possible R-value in places where the full intended thickness of insulation won’t fit. Install insulation to a consistent depth. Level the insulation if necessary. Batt-Type Insulation Install batts in contact with the surface between the conditioned space and attic, cut to fit, placed tightly together with no gaps except those required for clearance around heat-producing fixtures. Install baffles and shields prior to installing batt-type insulation. Cover the exterior of the top plates of exterior walls. You may compress the batts at the eaves if necessary to cover the top plates. Foam Insulation In an open attic, a sloped roof cavity, or an attic knee wall, both spray or rigid foam are acceptable types of insulation, provided they meet the following requirements. The foam insulation must meet the minimum requirements for R-value. Contractors must install the foam insulation in contact with the surface that separates attic and conditioned space. The foam insulation must comply with thermal-barrier and ignition-barrier code requirements for “foam plastics,” as defined by the local building code or allowed by local building officials.