On 14 Jul 2004 03:12:05 -0700, a particular chimpanzee named
(Wordy) randomly hit the keyboard and produced:

I am thinking of putting a conservatory on to the back of my house,
and am wondering how I am going to keep the use of my airbricks.

Run 100mm diameter pipes under the concrete slab to telescopic vents
in the external wall.

If yo have a suspended (timber) floor for the conservatory, there
should be at least 150mm clear air space between the underside of the
joists and the top of the concrete oversite. Your external ground
level should be no higher than your oversite, otherwise you run the
risk of water collecting under the floor.
--
Hugo Nebula
'What you have to ask yourself is,"if no-one on the internet wants
a piece of this, just how far from the pack have you strayed?"'