Insulation materials shall comply with the requirements of their respective ASTM standard specification and shall be installed in accordance with their respective ASTM installation practice in Table R303.2.1 in such a manner as to achieve rated R-value of insulation. Open-blown or poured loose-fill insulation shall not be used in attic roof spaces when the slope of the ceiling is more than 3 in 12. When eave vents are installed, baffling of the vent openings shall be provided to deflect the incoming air above the surface of the insulation.
Exception: Where metal building roof and metal building wall insulation is compressed between the roof or wall skin and the structure.
INSULATION INSTALLATION STANDARDS
|INSULATION MATERIAL||STANDARD SPECIFICATION||INSTALLATION PRACTICE|
|Mineral Fiber Batt/Blanket||ASTM C665||ASTM C1320|
|Mineral Fiber Loose Fill||ASTM C764||ASTM C1015|
|Cellulose Loose Fill||ASTM C739||ASTM C1015|
|Polystyrene Foam||ASTM C578||—|
|Polyisocyanurate Foam||ASTM C1289||—|
|Reflective||ASTM C1224||ASTM C727|
|Radiant Barrier||ASTM C1313||ASTM C1158|
|Spray-applied Rigid Cellular Polyurethane Foam||ASTM C1029||—|
|Interior Radiation Control Coating Systems||—||ASTM C1321|
Insulation that has been compressed to 85 percent or less of the manufacturer's rated thickness for the product shall use the R-values given in Table 303.2.1.1. These values are to be used except where data developed by an independent testing laboratory are provided.
R-VALUES OF COMPRESSED INSULATION
|% OF ORIGINAL THICKNESS||R-5||R-7||R-11||R-14||R-19||R-30||R-38|
Insulation shall be installed in a permanent manner in substantial contact with the inside surface in accordance with manufacturer's 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 inches (610 mm) on center (o.c.).
Exception: Insulation materials that rely on airspaces adjacent to reflective surfaces for their rated performance.