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How Capillary Action Affects the Building Envelope — and How Drainable Housewrap or Rainscreen Systems Help
Technical Article

How Capillary Action Affects the Building Envelope — and How Drainable Housewrap or Rainscreen Systems Help

Capillary action can trap liquid water between cladding, WRB and sheathing, especially when materials are in close contact. This article explains why capillary moisture matters in wall assemblies and how drainable housewrap or rainscreen systems help improve drainage, drying and long-term wall durability.

2026-06-11