Resolving water ingress through low underfloor air vents.

Question

How do I make a gully type feature to prevent water entering my very low underfloor air vents? The builder suggested digging a trench, placing a brick fort  around the two vents, then filling the trench with pebbles or dirt. He mentioned a membrane, only I can't remember which type. Please can you advise as water currently goes under the floor through the air vents. (Old Edwardian property). Thanks so much.

James · Accepted Answer

An air brick should be a minimum of 150 mm from ground level if this has been compromised in someway like having a driveway resurfaced or slabbed and this has brought the ground level up then I would suggest installing ACO drains also called storm drains .I hope this is of help to you.

Andrew · Answer

You would need a 1200 gauge heavy duty polythene which acts as a membrane

Doug · Answer

Try having aco drain gully fitted to run the water away it will require trenching out but I’m my view it’s better than covering with pebbles the vents are there for a reason

Ryan · Answer

Filling a trench with pebbles does absolutely nothing to help this type of issue. You will require someone with damp and drainage experience to fix the issue.

Resolving water ingress through low underfloor air vents.

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