Air brick height Question

Hi,

I’m currently replacing the floorboards in one of my bedrooms (Bungalow) and decided to check and clear out the air brick, which had been partially blocked with some kind of wire brush and various other bits of rubbish. It's an air brick in the external block wall.(pictures are hopefully attached)




As shown in the pictures the DPC is sagging down in front of the air brick which made me think, should there be a duct or channel coming in from the air brick to direct the air into the void under the floor?

Does it matter that air is potentially getting into the cavity?

Should I try to stick the DPC up somehow?

Also should the air brick be lower?

Any advice would be appreciated.

Thank you.

Any use? will off-set the flow of air directly into the under floor area

As an aside I am not an advocate of vented cavities?

https://source.thenbs.com/product/t...9YKxS4UdZ9Qgq2ryBCyXx7/9YKxS4UdZ9Qgq2ryBCyXx7

Ken.

Your cavity appears to have blown wool CWI - the brush thing is to prevent the loose cavity fill from blocking air bricks.
Dont pull it out.
Your Cu pipe riser is directly in harms way from freezing air coming thro the air brick.
The Cu pipes should be lagged and clipped to the underside of each joist.
The DPC droop is irrelevant. Leave it alone.

Ideal solution would be to move the air brick or even block/brick it up if there are plenty of other air bricks on the elevation. Or you could re-arrange the rad pipe away from the air brick?
Could you post a pic of the outside at ground level?

if you have it handy, you can stuff mineral wool quilt, as used in loft insulation, into the open gaps in the cavity. It will stop draughts and loose fragments of wall fill. If you can form it into a sort of "U" shape and push the arms of the "U" in with the curve facing out, it will be neater and less ragged. You can squeeze it flat and it will expand a bit as it relaxes so it wil not fall out.

Thanks for the replies everyone.

I did buy some lagging as had planned to do that whilst I have access, so will be lagging the pipes.

tel765, there should be a picture attached of the air brick from the outside. It's one of two for the front elevation, probably about 4 or 5 metres apart so can't really block that one up.

The ducts that KenGMac mentioned seem like they might be the easiest solution? That way it'll stop the blown insulation from ever blocking the air brick and then get the cold air in a less direct path to the pipes, but depends on how easily they'll fit in the space I suppose. I think the rest of the air bricks around the house are the same setup so will need to do it to each I imagine.

Moving the air brick is a bit beyond my skill level, but might know someone that can give me a hand if it's really necessary, however I imagine I'd need to cut another hole in the block sleeper wall, and then another (moved) air brick on the opposite external wall so it is all in line. So lots more work if I go that route.

JohnD, I do have some spare 100mm mineral wool insulation going so could always utilise that if needed.