![]() A Portland cement/sand parge, or gypsum plaster having a thickness of not less than 5/ 8 inch (15.9 mm).Fully adhered single-ply roof membrane.Cement board having a thickness of not less than 1/ 2 inch (12.7 mm).Exterior or interior gypsum board having a thickness of not less than 1/ 2 inch (12.7 mm).Open-cell spray foam with a density between 0.4 and 1.5 pcf (0.6 and 2.4 kg/m 3) and having a thickness of not less than 4.5 inches (113 mm).Closed-cell spray foam having a minimum density of 1.5 pcf (2.4 kg/m 3) and having a thickness of not less than 1 1/ 2 inches (38 mm).Foil-back polyisocyanurate insulation board having a thickness of not less than 1/ 2 inch (12.7 mm).Extruded polystyrene insulation board having a thickness of not less than 1/ 2 inch (12.7 mm).Oriented strand board having a thickness of not less than 3/ 8 inch (10 mm).Plywood with a thickness of not less than 3/ 8 inch (10 mm).Materials in Items 1 through 16 shall be deemed to comply with this section, provided that joints are sealed and materials are installed as air barriers in accordance with the manufacturer's instructions. m 2) under a pressure differential of 0.3 inch water gauge (75 Pa) when tested in accordance with ASTM E2178 shall comply with this section.Materials with an air permeability not greater than 0.004 cfm/ft 2 (0.02 L/s Where similar objects are installed that penetrate the air barrier, provisions shall be made to maintain the integrity of the air barrier. Recessed lighting fixtures shall comply with Section C402.5.8.Caulking or other adhesive sealants shall not be used to fill voids between fire sprinkler cover plates and walls or ceilings. Sealing of concealed fire sprinklers, where required, shall be in a manner that is recommended by the manufacturer. Sealing materials shall be securely installed around the penetration so as not to dislodge, loosen or otherwise impair the penetrations' ability to resist positive and negative pressure from wind, stack effect and mechanical ventilation. Joints and seams associated with penetrations shall be sealed in the same manner or taped. ![]() Sealing shall allow for expansion, contraction and mechanical vibration. Penetrations of the air barrier shall be caulked, gasketed or otherwise sealed in a manner compatible with the construction materials and location.The joints and seals shall be securely installed in or on the joint for its entire length so as not to dislodge, loosen or otherwise impair its ability to resist positive and negative pressure from wind, stack effect and mechanical ventilation. ![]()
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