My plumber has just fitted our thermostatic mixer valve and diverter. In order to do this he has had to chase out a section of the wall.
Before i tile over it i assume i'm going to have to fill this hole.
He has lagged the pipes with what looks like some sort of hessian matting.
How should i go about filling this hole. Patching plaster?
Do i need to give the pipes space to 'breathe'?
It's about 6 inches deep in places.