Page 230 - Masonry and Concrete

Footings, Foundation Walls, Basements, and Slabs
229
FOOTINGS, FOUNDATION WALLS, BASEMENTS, AND SLABS

Water collected by perimeter drains should be drained by gravity
outflow to an exposed lower elevation, to a dry well that is above the
water table, or to an approved storm sewer system. When these dis-
posal methods are not feasible or practical, it will be necessary to col-
lect the water in a sump and pump it out mechanically. Perimeter
drains are often located just inside rather than outside the footings,
particularly when a sump is necessary. Weeps should be located every
32 in. along the base of the foundation wall or at the top of the footing
to allow any water which builds up on the outside of the wall to flow
into the gravel bed inside the footing and then into the drain (Figure 6-
37). Floor slabs should be cast at a level above the weep holes.

DAMPROOFING OR
WATERPROOFING
AND PROTECTION
BOARD

2" FILTER FABRIC
WEEPS

TO SUMP, STORM SEWER, OR OUTFALL
FIGURE 6-37
Interior drain for sump. (from Beall, Christine, Thermal and Moisture Protection Manual,
McGraw-Hill, New York).

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