I've recently moved into a house which had a wooden decking added
outside the back door earlier this year.
Our surveyor told us that the decking was covering an air brick into
our cellar, so to reinstate the air circulation, we'd need to add some
ventilation to it.
Is there a specific type of wooden vent I can buy to keep with the
look of the current decking? Or am I going to have to fit one of
these brass/stainless steel/white plastic vents you get in the sheds?
Are you sure that it is the decking (the wood you walk on) and not the frame
to which the decking is attached that is blocking the air brick?
If there is just wood above the vent, then presumably cutting the ends back
by eg. 20mm would provide an airway to the air brick, and not cause any
hazard as it will be right up against the wall.
If a supporting memeber is blocking the air brick, you may have to lift and
re-lay the decking to allow air in.
Or if you can't free it from the decking side, can you cut a new airbrick
hole? With a vent to keep mice etc out.
Why not ring your surveyor and ask him to expand on it. I've always found
them very happy to do so and suggest options.
Good question. As long as the ledger isn't covering an air brick I can't
see a problem. As long as there are gaps of 5mm between the boards there
will be plenty of airflow through the deck.
I always leave gaps in the ledger plate where the air bricks are.
Thanks for all your suggestions guys.
To clarify, the entire decking structure itself is apparently
preventing the airbrick from 'breathing'.
It's not that there's an individual piece of wood in any form that
actually covers the airbrick.
airflow through the deck.
I really don't know anything about decking - it came with the house,
but I'm sure the gaps between the boards are less than 5mm. I'll
double-check tonight. But to confirm - you're saying that decking
should be fitted with 5mm gaps between the boards you walk on, and
this is ample airflow? Makes perfect sense when you put it that
However, I think the gaps between the boards are much less than that -
they may not be right up against each other, but there's very little
Basically, I'd rather be safe than sorry - if I can (or need to) do
something now to prevent any damp problems later, I'll do it - even if
it's not that pretty.
Like I said in the OP - my surveyor brought it up - it probably
wouldn't even have occured to me! =:-O
All the books & info I've read suggests a 10mm gap, but IMO that makes no
allowance for the time of year the deck was installed.
I built a deck last week, hissing down with rain for the first day & a half,
so the timber was soaking wet. I used a 4mm gap because the moisture
content will never be greater. In the summer the gap will increase to maybe
Because of the wet weather the gaps should be at their smallest, they will
open in hot dry weather.
How are the edges of the deck finished? Is it attached to the house on just
one side or more?
Surveyors don't have much respect on UK DIY :-)