Which of the following foundation waterproofing methods is specifically required by Michigan Building Code for basement walls in areas with high water tables?
Correct Answer
B) Waterproofing membrane with perimeter drain system
Michigan Building Code requires waterproofing membrane and perimeter drainage systems for basement walls in high water table areas to prevent water infiltration.
Why This Is the Correct Answer
Option B (Waterproofing membrane with perimeter drain system) is correct. Where high water table conditions exist, Michigan Building Code requires full waterproofing (not just damp-proofing) combined with a perimeter drain system. The membrane prevents water intrusion, while the drain relieves hydrostatic pressure. This two-part system is specifically mandated for high water table conditions.
Why the Other Options Are Wrong
Option A: Damp-proofing with asphalt coating only
Option A (Damp-proofing with asphalt coating only) is incorrect. Damp-proofing is the minimum requirement for normal soil conditions without significant groundwater. It is NOT sufficient for high water table areas — the code upgrades the requirement to full waterproofing plus drainage in such conditions.
Option C: Gravel backfill without membrane protection
Option C (Gravel backfill without membrane protection) is incorrect. Gravel backfill improves drainage but does not waterproof the wall. Without a membrane, water can still pass through the concrete or masonry wall. Gravel alone does not meet the code requirement for high water table areas.
Option D: Interior sealant application after construction
Option D (Interior sealant application after construction) is incorrect. Interior sealants address symptoms (interior moisture), not the source. The code requires exterior waterproofing during construction, not interior treatments applied after the fact. Interior sealants are not an approved code substitute for exterior waterproofing.
Memory Technique
Remember the rule: 'High water = full waterproofing.' Normal soil = damp-proof. High water table = waterproof membrane + perimeter drain. Think of it as defense in depth: the membrane stops water, the drain relieves the pressure.
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