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PostPosted: Fri Feb 16, 2018 1:45 pm 
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Hi,

We've been having problems with damp / mould in the conservatory for a while now. I'm recently led to believe the damp is coming in through a 'concealed' air brick.

The house is a fairly standard 1997 built detached house. It's got 4 air bricks on each side of the house - as far as I can see to ventilate the cavity as it has a solid brick floor - air bricks also seem to be pretty much at floor level. Cavity had insulation put in about 6 or 7 years ago. A conservatory was added before we bought it and it looks like nothing was done to the two air bricks that are now in the conservatory. Recently after putting some shelves into the conservatory against the house wall the laminate floor 'sunk' a little bit and detached from the beading and that's when we noticed what we at first thought was a leak. After removing the beading I see a partially concealed air brick. With the beading gone there now looks to be dampness on the bricks around the air brick. Dehumidifier is taking out plenty of water! Other change a couple of years ago was a new roof which also removed some of the vents around the top.

Wondering if it's ok to block up these two air bricks - there would still be 2 along the back wall and all the other walls have 4 each. Also are the air bricks neccessary now the cavity has insulation in it?

Appraciate any thoughts from people...


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PostPosted: Fri Feb 16, 2018 5:14 pm 
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:welcomeuhm:

Pics inside and out of the problem area please.

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PostPosted: Sat Feb 17, 2018 9:14 am 
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Thanks for the response. Attached two pictures - first a close up of air brick in conservatory showing dampness on bricks around. Second shows the other air bricks outside of the conservatory on the back wall.


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PostPosted: Sat Feb 24, 2018 8:17 am 
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Anyone any thoughts..?


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PostPosted: Sat Feb 24, 2018 3:34 pm 
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Can't tell what level your damp proof course is from those pics...

I can see 2 more air bricks outside the conservatory though, pics around that area may help.

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PostPosted: Sat Feb 24, 2018 6:25 pm 
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Attached 3 more pictures - 2 of the outside air bricks - looks like the damp course is above them. The other pictures is the inside again - took a strip of laminate up. Lot of damp :-(

Do they help?

Thanks.


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PostPosted: Sat Feb 24, 2018 7:04 pm 
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The vents would have been venting the cavity ( waste of time ) as the outer wall would have been a rain screen and any moisture in the cavity would have been dried via a continuous air flow via low level vents and high level vents.
The cavity is now blocked with blown in insulation ( bad idea )
The vents at high level have been removed
Outer vents in the conservatory are now internal, turning outer wall to internal.

Cut out a few bricks by the vents, is the cavity lower than the floor, and how much.
Basically since the cavities have been insulated all the vents are void.


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