Air bricks, vents and other entry points
Checked 23 Oct 2026
Air brick covers, self-closing air bricks, non-return valves, sealing, and sumps and pumps: the less obvious ways water reaches a home.
Guides
- Air brick covers vs self-closing air bricksAir brick covers and self-closing (automatic) air bricks compared on effort, when they work and ventilation, plus what to measure and the certification to look for.
- Non-return valves: stopping sewage backflow in a floodHow floodwater and sewage can push back up through drains, and how non-return valves help.Being written
- Sump pumps for cellars and basements: a UK buyer's checklistWhen a sump and pump helps a cellar or basement, what to check before buying, and planning for power cuts.Being written
- Where water gets in: a room-by-room flood entry checklistA walk-round checklist of the places floodwater can get into a home.Being written
Air bricks and vents
Editor: write this section from the sources in the front matter.
Drains, toilets and backflow
Editor: write this section from the sources in the front matter.
Walls, gaps and pipe entries
Editor: write this section from the sources in the front matter.
Basements and cellars
Editor: write this section from the sources in the front matter.
Sources
- Code of practice for property flood resilience (CIRIA C790) (CIRIA), checked 23 Oct 2026
- BS 851188-1:2019+A1:2021 Flood resistance products: building products (BSI), checked 23 Oct 2026