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Title: Section 1402  •  Size: 4564

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1402.1 Weather-resistive Barriers. All weather-exposed surfaces shall have a weather-resistive barrier to protect the interior wall covering. Such barrier shall be equal to that provided for in U.B.C. Standard 14-1 for kraft waterproof building paper or asphalt-saturated rag felt. This standard is listed in Chapter 35, Part II, and is a part of this code. Building paper and felt shall be free from holes and breaks other than those created by fasteners and construction system due to attaching of the building paper, and shall be applied over studs or sheathing of all exterior walls. Such felt or paper shall be applied horizontally, with the upper layer lapped over the lower layer not less than 2 inches (51 mm) . Where vertical joints occur, felt or paper shall be lapped not less than 6 inches (152 mm).

Weather-protected barrier may be omitted in the following cases:

1. When exterior covering is of approved weatherproof panels.

2. In back-plastered construction.

3. When there is no human occupancy.

4. Over water-repellent panel sheathing.

5. Under approved paperbacked metal or wire fabric lath.

6. Behind lath and portland cement plaster applied to the underside of roof and eave projections.

1402.2 Flashing and Counterflashing. Exterior openings exposed to the weather shall be flashed in such a manner as to make them weatherproof.

All parapets shall be provided with coping of approved materials. All flashing, counterflashing and coping, when of metal, shall have a minimum thickness of 0.019 inches (0.48 mm) (No. 26 galvanized sheet metal gage) corrosion-resistant metal.

1402.3 Waterproofing Weather-exposed Areas. Balconies, landings, exterior stairways, occupied roofs and similar surfaces exposed to the weather and sealed underneath shall be waterproofed and sloped a minimum of 1/4 unit vertical in 12 units horizontal (2% slope) for drainage.

1402.4 Dampproofing Foundation Walls. Unless otherwise approved by the building official, foundation walls enclosing a basement below finished grade shall be dampproofed outside by approved methods and materials.

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