I am up to DPC level with my foundation and need to get the foul drains
in place before filling with hardcore for the slab.

I have left gaps in two places for the pipe to go through the wall and
have a few questions.

Part H tells me that I have to "mask opening both sides with rigid sheet
material" and "fill void with compressible sealant". It doesn't state
material for these so I was guessing plywood for the sheet material, not
sure about the compressible sealant though?

Also what would be the appropriate distance to set the vertical pipe
running through the slab away from the wall? One is for an internal SVP
from an upstairs toilet (will be boxed in), the other is for a toilet in
a downstairs cloaks?

Cheers

Martin
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Martin Carroll