Green Building Forum - Installing air brick sleeve

Installing air brick sleeve

Osprey — Mon, 19 Dec 2022 20:33:24 +0000

I am considering EPS beads CWI, and have been looking into via a borescope and our airbricks.

Part of the property has solid floors, and I beleive they are sealed from the wall cavity, and have a tunnel to the rest of the house (suspended wooden floor). A couple more are sealed from the wall cavity, and directly access the sub-floor void. However, approx 6 air bricks are unsealed and also vent the wall cavity. The 1920s house is rendered, with a cement plinth. 50mm cavity, brick walls.

It would be very difficult to remove the airbricks from the outside, and also risk loosening the render. If I can get access from inside, via the underfloor void, would it be possible to add sleeves to the existing air bricks, sealing with eg expanding foam? Or any other suggestions.

Thanks!

Installing air brick sleeve

tony — Tue, 20 Dec 2022 07:12:28 +0000

Foam works for me, I would try to partially inflate a balloon, may be two then foam round them . Alternatively foam it all up and cut a track through it afterwards. Old drain pipes from inside may work best

Installing air brick sleeve

fostertom — Tue, 20 Dec 2022 10:35:12 +0000

How do you mean "solid floors ... sealed from the wall cavity, and have a tunnel to the rest of the house (suspended wooden floor)"? Do the solid floors have a void under them?

Installing air brick sleeve

Osprey — Tue, 20 Dec 2022 17:54:20 +0000

Posted By: fostertomHow do you mean "solid floors ... sealed from the wall cavity, and have a tunnel to the rest of the house (suspended wooden floor)"? Do the solid floors have a void under them?

No void (of which I am aware). I will need to have some more borescope action to be sure,

Installing air brick sleeve

Osprey — Thu, 22 Dec 2022 12:15:14 +0000

It turns out the air bricks around the solid floor section only serve the cavity wall, and do not go (far) into the solid floor itself. So that can be sealed off then, when cwi installed.