Drain through wall

[23vc]

Hi
Got a couple of gullies where the 110mm orange pipe goes through the cavity brickwork below dpc, which I have lintelled over. The building inspector has pointed me to the regs saying it must be surrounded by "Compressible sealant" and masked either side with a rigid board. Neither of which anything springs to mind, if anyone's got any suggestions they'd be gratefully received!
Cheers
John

 

[freddiemercurystwin]

Use a bit of rockwool round the pipe and then a bit of cement board.

 

[23vc]

lovely, thanks