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Title: Section 1824  •  Size: 4722

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SECTION 1824 - OTHER DAMPPROOFING REQUIREMENTS

1824.1 Subsoil Drainage System. When dampproofing is required, a base material shall be installed under the floor and a drain shall be installed around the foundation perimeter in accordance with this subsection.

EXCEPTION: When the finished ground level is below the floor level for more than 25 percent of the perimeter of the building, the base material required by Section 1824.2 need not be provided and the foundation drain required by Section 1824.3 need be provided only around that portion of the building where the ground level is above the floor level.

1824.2 Base Material. Floors shall be placed over base material not less than 4 inches (102 mm) in thickness consisting of gravel or crushed stone containing not more than 10 percent material that passes a No. 4 sieve (4.75 mm).

1824.3 Foundation Drain. The drain shall consist of gravel, crushed stone or drain tile.

Gravel or crushed stone drains shall contain not more than 10 percent material that passes a No. 4 sieve (4.75 mm). The drain shall extend a minimum of 12 inches (305 mm) beyond the outside edge of the footing. The depth shall be such that the bottom of the drain is not higher than the bottom of the base material under the floor, and the top of the drain is not less than 6 inches (152 mm) above the spread portion of the footing. The top of the drain shall be covered with an approved filter membrane material.

When drain tile or perforated pipe is used, the invert of the pipe or tile shall be not higher than the floor elevation. The top of joints or the top of perforations shall be protected with an approved filter membrane material. The pipe or tile shall be placed on not less than 2 inches (51 mm) of gravel or crushed stone complying with this section and covered with not less than 6 inches (152 mm) of the same material.

1824.4 Drainage Disposal. The floor base and foundation perimeter drain shall discharge by gravity or mechanical means into an approved drainage system.

EXCEPTION: Where a site is located in well-drained gravel or sand-gravel mixture soils, a dedicated drainage system need not be provided.

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