Full-Fledged Exterior Foundation Waterproofing
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What happens here
Full-fledged exterior foundation waterproofing is the most invasive but effective solution. This involves excavating all soil down to the footing of the foundation. The foundation wall is then thoroughly cleaned, tuckpointed (repairing mortar joints), and coated with a waterproofing compound like Dry Seal Premium Rubberized Foundation Coating or Gray Shield Foundation Coating. A dimpled foundation wrap (like Platon DMX AG Foundation Wrap) or another waterproofing membrane is then applied, followed by insulation (polystyrene sheets) to protect the membrane and prevent freeze/thaw cycles. Finally, the trench is backfilled, first with permeable aggregate (like 3/4 inch clear rock or Class V aggregate) and then with non-permeable clay at the top to shed surface water. Proper compaction of the backfill is crucial to prevent future settlement issues.
Goal: Create a completely watertight and protected exterior foundation.
Tools and materials
- Foundation Wrap — Providing an additional waterproofing layer and drainage plane
- Mid or Mini Excavator Daewoo — Excavating soil around the foundation
- Rubberized Foundation Coating Dry Seal — Applying a waterproof layer directly to the foundation walls
- Tuck Pointing Tools — Repairing mortar joints in masonry walls
- Mortar/Tuckpointing Compound — Repairing cracks and gaps in the foundation walls
- Non-Permeable Clay — Backfilling the top portion of the trench to shed surface water
- Permeable Aggregate — Backfilling the lower portion of the trench to allow water to drain
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