I'm looking to improve the ventilation to a suspended timber floor with
some new vents - they'll open to an outside path that has built up over
the years to near internal floor level.

I see there's these 'periscope' type things:

https://manthorpebuildingproducts.co.uk/product/g965-dual-extended-underfloor-vent

But it seems to me they'd take a fair chunk out of the 9" solid brick
walls, and the air flow doesn't look that good.

Would flat letterbox-sized grilles over a say 10" deep 'pit' feeding a
horizontal cut through the wall below the existing floor work?

I can see the issue of debris falling in, but if the grilles are
reasonably removable I can't see that being a dire problem. If it is
doable, is there a source of grille/conduit - can't seem to see anything
online.

--
Cheers, Rob

On 28/05/2019 22:16, RJH wrote:
I'm looking to improve the ventilation to a suspended timber floor with
some new vents - they'll open to an outside path that has built up over
the years to near internal floor level.

I see there's these 'periscope' type things:

https://manthorpebuildingproducts.co.uk/product/g965-dual-extended-underfloor-vent


But it seems to me they'd take a fair chunk out of the 9" solid brick
walls, and the air flow doesn't look that good.

Would flat letterbox-sized grilles over a say 10" deep 'pit' feeding a
horizontal cut through the wall below the existing floor work?

I can see the issue of debris falling in, but if the grilles are
reasonably removable I can't see that being a dire problem. If it is
doable, is there a source of grille/conduit - can't seem to see anything
online.


I've seen "pits" down the side walls of houses with a conventional vent
in the wall 6" or so down. Older houses mind, but as long as the pit
cannot fill with rainwater, it's a solution.

--
Email does not work

In message , Tim Watts
writes
On 28/05/2019 22:16, RJH wrote:
I'm looking to improve the ventilation to a suspended timber floor
with some new vents - they'll open to an outside path that has built
up over the years to near internal floor level.
I see there's these 'periscope' type things:

https://manthorpebuildingproducts.co...l-extended-und
erfloor-vent But it seems to me they'd take a fair chunk out of
the 9" solid brick walls, and the air flow doesn't look that good.
Would flat letterbox-sized grilles over a say 10" deep 'pit' feeding
a horizontal cut through the wall below the existing floor work?
I can see the issue of debris falling in, but if the grilles are
reasonably removable I can't see that being a dire problem. If it is
doable, is there a source of grille/conduit - can't seem to see
anything online.


I've seen "pits" down the side walls of houses with a conventional vent
in the wall 6" or so down. Older houses mind, but as long as the pit
cannot fill with rainwater, it's a solution.

We have those. The exterior ground levels are well above damp course so
I put a pea gravel french drain round the entire house. The suspended
floor vents are protected by concrete edging. They gather a few leaves
but not much of a problem.


--
Tim Lamb

Whatever you do about things like damp courses, for goodness sake fit a fine
mesh over them. I have found wasps love to live under your floors, even
better if there are nice warm pipes under it and of course its a sod of a
job to remove the nest without ruining the floor. Bah humbug.
Brian

--
--
From the sofa of Brian Gaff -

Blind user, so no pictures please!
Today is Yesterdays Tomorrow.
"RJH" wrote in message
...
I'm looking to improve the ventilation to a suspended timber floor with
some new vents - they'll open to an outside path that has built up over
the years to near internal floor level.

I see there's these 'periscope' type things:

https://manthorpebuildingproducts.co.uk/product/g965-dual-extended-underfloor-vent

But it seems to me they'd take a fair chunk out of the 9" solid brick
walls, and the air flow doesn't look that good.

Would flat letterbox-sized grilles over a say 10" deep 'pit' feeding a
horizontal cut through the wall below the existing floor work?

I can see the issue of debris falling in, but if the grilles are
reasonably removable I can't see that being a dire problem. If it is
doable, is there a source of grille/conduit - can't seem to see anything
online.

--
Cheers, Rob

Maybe so but a load of decaying dead wasps are not a nice thing to think
about under your floor!
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Chris Hogg" wrote in message
...
On Wed, 29 May 2019 09:13:12 +0100, "Brian Gaff"
wrote:

Whatever you do about things like damp courses, for goodness sake fit a
fine
mesh over them. I have found wasps love to live under your floors, even
better if there are nice warm pipes under it and of course its a sod of a
job to remove the nest without ruining the floor. Bah humbug.
Brian

--
You don't need to remove the nest as such. All you have to do is spray
the air brick or whatever, where they're getting access, with a
foaming wasp killer, and as they come and go, they carry it into the
nest and the occupants all die within a day or so. Then the nest
itself just dries out and decays over the next few months or years.
It's only made of paper, after all.

--

Chris

On Thursday, 30 May 2019 07:22:02 UTC+1, Brian Gaff wrote:
Maybe so but a load of decaying dead wasps are not a nice thing to think
about under your floor!
Brian

Almost anything is not nice to think about when you're stuck under your floor.


NT

On 30/05/2019 08:01, wrote:
On Thursday, 30 May 2019 07:22:02 UTC+1, Brian Gaff wrote:
Maybe so but a load of decaying dead wasps are not a nice thing to think
about under your floor!
Brian

Almost anything is not nice to think about when you're stuck under your floor.

It can be quite restful down there - a few minutes' break, in the quiet,
while you've sent your son off to fetch something to save yourself from
having to crawl out.

SteveW