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 Post subject: Air Brick Positioning
PostPosted: Mon Jan 21, 2008 10:59 am 
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Simple question, I think..

Got 1930's house with standard timber floorboards over joists.

There are air bricks outside and just 'missing' bricks inside to continue the airflow.

Question is: The air bricks are positioned so that the bottom bit is below the joists but there is also flow onto the edge of the floorboards and a couple of inches ABOVE the floorboards - which would normally to covered by the skirting (removed skirting whch is how I have noticed this).

Is this normal? I thought the air brick position is usually fully directed to the underfloor void :scratch:

If it is not normal, is there anything I should do before refitting new skirting?

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PostPosted: Mon Jan 21, 2008 11:30 am 
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Hi, I've the same problem with my own house. I was going to block the top half above the floorboards with insulation board and fill any gaps. I thought it was a mistake when the house was built in 1929 because the house is built on a slope and room next to it the air brick is under the floorboards.
Would be good to hear if this is the right course of action as I don't want to create myself work in the future.


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PostPosted: Mon Jan 21, 2008 11:36 am 
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All the ones I have seen have been below the surface of the floor :scratch:

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PostPosted: Mon Jan 21, 2008 11:46 am 
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Borders Bodger
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My last house had air bricks fully under floor.

Now Q's post is interesting ....he has the same situation and his house is on a slope - and so is mine!

The land around my house drops both side to side and front to back (basically I live on a hillside!) and the dampproof course staggers along the length and width of the house, dropping by a brick course or two both ways.

Let's hope me and Q get some good pointers from the pros :thumbright:

On the plus side, there is no damp anywhere and the void dirt is totally dry (bloody drafty though :lol: )

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PostPosted: Tue Jan 22, 2008 6:58 pm 
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Hoovie
As long as there is through movement of air you will have no problems.
Also no real gain or real loss in blocking up the vent above the floor level as this would have been blocked by the skirting anyway.
It is usual to step the dpc with the ground level to some extent.
I would say that it was a minor detail balls up when newly built.

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PostPosted: Tue Jan 22, 2008 7:20 pm 
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That is good news :thumbright:

I think I can see why they may have done this - avoiding a bigger step outside then need be at the back of the house compared to the front :scratch:

One little add-on question ... When I fit the new skirting, I'll be caulking the top part where it presses on the wall. Should I also seal the bottom in some way?
(Last time I did a similar project, I could feel a significant draft from the gap between floor and skirting (there was only a mil or two gap) - and that was with normally positioned airbricks.)

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PostPosted: Wed Jan 23, 2008 12:06 am 
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I think if left as floor boards that you will feel the draft if you look for it anyway.
If not then yes seal behind the skirting, but obviously not the air brick.
There is a tendency with modern building methods, regs etc to basically seal up a building completely and then use controlled ventilation. Bit like living in a plastic bag with hit & miss vents.
Older properties work fine until you start sealing up the existing air flows.

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PostPosted: Wed Jan 23, 2008 7:55 am 
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:thumbright:
Got massive gaps between boards and putting down insulation and flooring on top.
Already made sure all airbricks are completely clear (and got a fireplace in the room as well) :-)

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PostPosted: Wed Jan 23, 2008 8:00 am 
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sounds like you have a plan! and sounds like a good one at that

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