Weep vents are small openings in masonry or cavity walls that let trapped water drain out and help the wall dry. They’re commonly placed near the base of walls and above windows or doors to prevent dampness and damage.

Quick Scoop

In plain terms, a weep vent is a “drain outlet” for a wall cavity. It helps stop moisture from getting trapped inside the wall, which can lead to damp, mold, and deterioration over time.

What they do

  • Let water escape from cavity walls, lintels, and cavity trays.
  • Allow some airflow so the cavity can dry out.
  • Help reduce moisture-related problems like damp and structural damage.

Where you’ll see them

  • At the bottom of external masonry walls.
  • Above windows and doors, especially over lintels.

Common types

  • Open weep vents, which are simple gaps.
  • Grille or closed weep vents, which help keep out insects and debris.
  • Fire-resistant versions for specific building requirements.

If you want, I can also explain how to spot weep vents on a house or whether your wall should have them.