Below-grade walls face constant hydrostatic pressure and soil moisture. This article explains each waterproofing layer and how to assemble them effectively for long-term durability.
Overview
Basement waterproofing systems typically consist of multiple layers: primary membrane, drainage layer, protection board, and sometimes interior vapor control. Each must be compatible with the structure, soil condition, and insulation placement.
Layer Breakdown
- Bituminous or sheet membrane directly over concrete wall
- Drainage board with dimples or mesh to relieve pressure
- Protection board to shield membranes from backfill damage
- Interior coatings or vapor barriers where needed
š Quick Picks
- Peel-and-Stick Membrane:Ā Polyguard 650 Waterproofing Membrane
- Drainage Mat:Ā DELTA-DRAIN 6200
- Bituminous Protection Board:Ā Henry Drain Board Protector
Conclusion
Each layer in basement waterproofing has a roleāseal, drain, protect. When coordinated properly, these systems resist groundwater infiltration and protect indoor air and durability.
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Interior Moisture Control
In humid or mixed climates, ground moisture can also impact interior air quality. Use interior vapor retarders or air sealing strategies at slab edges and base wall plates. Mechanical ventilation and dehumidification play a supporting role in maintaining low humidity levels over time in basement spaces.
