5.8 Product Information and Installation Requirements
When eave vents are installed, baffling of the vent openings shall be provided to deflect the incoming air above the surface of the insulation.
Insulation shall be installed in a permanent manner in substantial contact with the inside surface in accordance with manufacturers' recommendations for the framing system used. Flexible batt insulation installed in floor cavities shall be supported in a permanent manner by supports no greater than 24 in. on center.
Lighting fixtures; heating, ventilating, and air-conditioning equipment, including wall heaters, ducts, and plenums; and other equipment shall not be recessed in such a manner as to affect the insulation thickness unless
- the total combined area affected (including necessary clearances) is less than 1% of the opaque area of the assembly,
- the entire roof, wall, or floor is covered with insulation to the full depth required, or
- the effects of reduced insulation are included in calculations using an area-weighted-average method and compressed insulation values obtained from Table A9.4.3.
Exterior insulation shall be covered with a protective material to prevent damage from sunlight, moisture, landscaping operations, equipment maintenance, and wind.
In attics and mechanical rooms, a way to access equipment that prevents damaging or compressing the insulation shall be provided.
Foundation vents shall not interfere with the insulation.
Insulation materials in ground contact shall have a water absorption rate no greater than 0.3% when tested in accordance with ASTM C272.
The roof insulation shall not be installed on a suspended ceiling with removable ceiling panels.
Where two or more layers of rigid insulation board are used in a construction assembly, the edge joints between each layer of boards shall be staggered.