Page 211 - Masonry and Concrete

Footings, Foundation Walls, Basements, and Slabs
210 CHAPTER SIX

FIGURE 6-19

Grouted and reinforced bond beam.

■ Walls support more than 48 in. of unbalanced backfill and do
not have permanent lateral support at the top and bottom.

When any of these conditions exist, walls must be designed in accor-
dance with accepted engineering practice and in accordance with the
requirements of an approved standard such as ACI 530/ASCE 5/TMS
402 Building Code Requirements for Masonry Structures, or ACI 318
Building Code Requirements for Reinforced Concrete.

6.3.2 Basement Walls
Basement walls are essentially just tall foundation walls which will
enclose habitable space instead of a crawl space. Their construction is
essentially the same, and the minimum requirements discussed above
for foundation walls apply equally to basement walls. The taller the
wall, though, the greater the lateral load it must resist as the backfill
soil pushes against it. Lateral support at the top of the wall is provided
by the first-floor framing, and at the bottom by the footing and base-
ment floor slab. Since the first floor helps resist soil pressures, back-
filling should be delayed until the floor construction is in place. If
earlier backfill is unavoidable, temporary bracing must be provided to

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