On 22/07/2019 16:33, Andrew wrote:
On 22/07/2019 11:30, R D S wrote:
On 21/07/2019 19:21, The Natural Philosopher wrote:
On 21/07/2019 13:17, R D S wrote:
I'm thinking 2 birds one stone here.....

I've been told I need better underfloor ventilation (there's no
ventilation at the back of the house, just the front).

We are doing some refurbishments so it's as good a time as any to
rip the floor up and put a couple of snorkel vents in the back wall.

And i'm blocking up a fireplace and apparently supposed to vent the
chimney. As it goes against the grain to send hard earned warm air
up the chimney I thought of venting the space under the floor into
the unused chimney instead.

It seems like a no brainer to me.

only possible downside is that it increases sub floor heat loss which
may be an issue if the floor is poorly insulated



We're in the process of covering it with 25mm polystyrene 'boards' and
T&G Caberfloor, so should be OK.

30% heat loss through the floor. If any air leaks between those
inadequate insulation panels then you might as well not bother.

There's nothing there now. Except the floorboards.