UFC 3-220-01N
15 AUGUST 2005
Table 3-2 Checklist for Influence of Site Characteristics on Foundation Selection
for Family Housing
Foundations
Site Characteristics
Post
Spread
Slab-on-Grade
Basement
(all)
Natural Ground
Grading
Level
None
--
--
--
1, 2, 3, 4, 5
Rolling
None
--
--
Requires Grading
1, 2, 3, 4, 5
Rolling
Cut and
--
1, 2, 3, 4, 5
1, 2, 3, 4, 5
1, 2, 3, 4, 5
Fill
Hilly
None
--
--
Requires Grading
1, 2, 3, 4, 5
Hilly
Cut and
--
1, 2, 3, 4, 5
1, 2, 3, 4, 5
1, 2, 3, 4, 5
Fill
Surface
Requires
--
Do Not Use
--
Temporary
Lowering
Footing Level Below Water
--
--
Use Perimeter
--
Level
Soil type
GW, GP, GM, GC, SW, SP,
1, 2
1, 2
1, 2
1, 2
SM, SC
ML, CL, OL, MH, CH, OH
3, 4, 5, 6
3, 4, 5, 6
3, 4, 5, 6
3, 4, 5, 6
1. Compaction control increase density if required, use compaction control in fills.
2. Check relative density of cohesionless (GW, GP, SW, SP) soils, generally based on standard
penetration resistance.
3. Use undrained shear strength to estimate stress and bearing capacity ratio for slab design.
4. Check if settlement is a problem.
5. Check liquidity index as indication of normally or pre-consolidated clay.
6. Check expansive properties.
3-4
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