John Kelly wrote:
The Natural Philosopher wrote:
John Kelly wrote:
My extension was built and I'm about to start laying topsoil and grass
and generally finishing off. I'm a little unsure of how high I can go
with the topsoil. Obviously I can't go above the damp proof course and
that's too high up anyway but I'd like to go about 2 bricks below it
as that's what it is around the rest of the house. However there are
gaps between some of the bricks that low down - it's about 5 bricks
between gaps. Can I go up past this level or are the gaps there to let
air in?

Blimey. What do you mean by 'gaps'

There should be no gaps blow ground, and its normal to let in proper
rodent proof vents if you need ventilation.

well, maybe gaps is the wrong word. Every 5 bricks there's no mortar
between the bricks so it looks like a gap.

--
John Kelly

There will be a tray dpc at that level built into the inner and outer
skins of the wall. It is to catch any moisture in the cavity and drain
it out through the holes you can see. It's probably not sensible to
cover them.

A