Additional airbricks

[SolRobinson]

Hi. On our survey we were told we had insufficient airbricks and that we should investigate for rot and damp. We have found no signs of damp or rot other than one area in the kitchen which is more likely caused by bridge cavity and a slow leak.

While I’ve got floors up, I want to make sure I increase the subfloor ventilation. Currently there is an air brick at the front and and air brick at the back. That’s it. The holes on the interior skin of the airbricks are full of **** and aren’t even inline with the exterior air brick, so they are more or less useless.

Through the middle of the house an old ducting system runs along the subfloor and would be blocking a lot of airflow from the front to the back of the house. So I’m wondering if it’s possible to add an airbrick to the side of the house at the back and then 2 additional at the front. I cannot add airbricks at the side at the front due to an inset garage (be more work ducting it through the garage)

Would this be a good solution? I know airbricks work best when they are opposite each other for better airflow, but this doesn’t need to be perfect, just better. I won’t be able to add any airbricks in the other side of the house as it is a semi. It seems the subfloor has been fine with the ventilation it has had so far but just for added peace of mind.

 

[^woody^]

If you have no damp issues with the existing airbricks, despite the house being like that for decades, then that suggests that the existing arrangement is adequate.

 

[phatboy]

Be cautious removing existing ducting systems, they may contain asbestos (But a pic on here would let someone confirm or not)

Just clear out the vents that are there, which should allow enough air to move, if it's been OK for the past X years