They let water collected on a cavity tray, lintel or damp-proof detail drain through the outer masonry leaf to the exterior.
Cavity Drainage Outlets for Masonry Walls
Moisture entering an outer masonry leaf needs a path back outside. Weep vents form small drainage openings in bed joints above cavity trays, lintels and other damp-proof details, allowing collected water to escape.
Position and spacing come from the wall design. Vents must align with the lowest part of the tray, remain open through mortar pointing and include stop ends where the detail requires them. Their narrow face should not be mistaken for the full drainage path behind.
Keep cavity insulation and mortar droppings clear of the tray. At roof abutments, coordinate weeps with cavity trays and flashings. Use the wider building materials range to complete the specified masonry detail without bridging the cavity.
Weep Vents FAQ's
Place them in the bed joint immediately above the drainage level shown on the cavity tray or lintel detail, with stop ends where required.
Spacing depends on the tray, opening and construction detail. Follow the manufacturer and project specification, including vents near each tray end.
Yes. Keep the vent and cavity path clear during laying and pointing. Blockage can trap water behind the outer leaf.
They are required where the wall detail needs cavity drainage, such as above certain openings, trays and damp-proof barriers. Follow the drawing and regulations.