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Title: Section 1505  •  Size: 4447

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SECTION 1505 - ATTICS: ACCESS, DRAFT STOPS AND VENTILATION

1505.1 Access. An attic access opening shall be provided to attics of buildings with combustible ceiling or roof construction. The opening shall be located in a corridor, hallway or other readily accessible location. Attics with a maximum vertical height of less than 30 inches (762 mm) need not be provided with access openings.

The opening shall not be less than 22 inches by 30 inches (559 mm by 762 mm).

Thirty-inch (762 mm) minimum clear headroom in the attic space shall be provided at or above the access opening.

1505.2 Draft Stops. Attics, mansards, overhangs and other concealed roof spaces formed of combustible construction shall be draft stopped as specified in Section 708.

1505.3 Ventilation. Where determined necessary by the building official due to atmospheric or climatic conditions, enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof rafters shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain and snow. The net free ventilating area shall not be less than 1/150 of the area of the space ventilated.

EXCEPTIONS: 1. The area may be 1/300 of the area of the space ventilated provided 50 percent of the required ventilating area is provided by ventilators located in the upper portion of the space to be ventilated at least 3 feet (914 mm) above eave or cornice vents with the balance of the required ventilation provided by eave or cornice vents.

2. The area may be 1/300 of the area of the space ventilated provided a vapor retarder having a transmission rate not exceeding 1 perm [5.7 x kg/()] is installed on the warm side of the attic insulation.

The openings shall be covered with corrosion-resistant metal mesh with mesh openings of1/4 inch (6.4 mm) in dimension.

Smoke and heat venting shall be in accordance with Section 906.

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