Did you know that certain soil conditions include constant water presence, requiring additional drainage strategies? A drainage composite is recommended when water exists in the soil surrounding a foundation.
A drainage composite is typically an open-weave or dimpled mat material, approximately ½” to 1” thick, that provides a space for water to flow downward toward the drain system. It also helps prevent rocks and debris from interfering with drainage.
Drainage composites play a critical role in below-grade applications. Their primary function is to reduce hydrostatic pressure and protect foundation materials from damage caused by improper drainage.
If a drainage composite is not incorporated, foundations may become susceptible to structural damage and water infiltration.
When backfilling foundation walls, the drainage composite also serves as a protective layer. It helps safeguard below-grade waterproofing systems from puncture, damage, or penetration during construction.
Always consult the geo-technical engineer and review the geo-technical report to determine soil types and water presence. Based on these findings, coordinate with product manufacturers and your building enclosure designer to select the appropriate drainage and waterproofing strategy.
Incorporating a drainage composite into below-grade assemblies improves water management, reduces hydrostatic pressure, and protects foundation systems during both construction and long-term operation. Proper coordination with engineers and manufacturers ensures the system performs as intended.
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