Airbricks. Through cavity or not?

[Albumen]

Just doing some remedial work in a very small kitchen extension. Timber floor and about 18 inches of subfloor space. There are 3 airbricks. Airbrick in the outside skin, and almost matching hole (i.e. one missing brick) on the inside skin. But that means the cavity is open to the inside.

Surely that should be sleeve from skin to skin, not open to the cavity.

I haven't got any damp problems, but have got little beastie problems, and would like to limit/control how they get into my house.

Cheers.

 

[dann09]

I should leave it as it is.

 

[noseall]

Yes it should be sleeved.

Anyone knocking out masonry above the air-bricks could risk clogging them up. Same applies if the cavity ever gets filled with blown insulation.

 

[Albumen]

Thanks. 2 different opinions then!

Stuff falling down the cavity and blocking the airbricks doesn't apply. It's a single storey extension, and almost the full width of the wall is a window, and I've got enough access from the inside just to have a quick root around now. The cavity wall insulation does apply though. Problem is the inside hole and the outside airbrick don't line up. So I'd have to bash the outside airbrick out (presumably easy, as it's got holes in it already) AND make a matching hole inside. And I'm under real time pressure here.

Will ponder.

 

[big-all]

a bit off 4 or 6" plastic pipe with the end angled assuming not to far appart

 

[dann09]

Dont bash out the air brick, just do as suggested above: use any 4" or 6" sleeve to pick up the air brick from the inside.

My earlier post was more concerned with you bashing out too much brickwork in a narrow panel of brickwork below a threshold or, as you have got, a window frame.

I didn't think of blown insulation, so good call noseall.