Tags: #buildingdesign #buildingenclosures #buildingenvelopes #buildingmaterials #buildingproducts #buildingscience #materialsscience #waterresistance

ABSTRACT: Two integrated sheathing systems were assessed for water resistance under prolonged hydrostatic pressure. Findings revealed stark contrasts in moisture performance based largely on material composition of exterior overlays, one representing a glass mat facer and the other a factory-applied fluid membrane. Water staining through glass mat-faced panels occurred at 18 to 24 hours in association with sealed wall interfaces and as a function of hydrostatic pressure. Conditions progressed over a typical seven-day test period culminating with panel saturation and uncontrolled water entry. Membraned-based panels showed no evidence of moisture accumulation or liquid water penetration after 30-days.