Membrane Seepage

摘要

Can a waterproofing membrane leak if it has no holes? Unfortunately, yes, under fairly common circumstances. Consider an asphalt-based membrane installed with little or no drainage, so that water stands on it. This may occur on a low-slope roof, or more commonly, on balcony and terrace decks with porous finishes, such as concrete or tile. If drainage is absent or impeded, water can slowly migrate directly through the membrane.