Drill thro' concrete ground floor.

[RichD1]

I'm having a rear extension built which has a large void underneath due to the sloping site. We're now at the first fit plumbing and electrics stage and as I've made access to the under void I would like them to put all the piping and wiring (apart from lighting) underneath and then come up thro' the slab. This, in my view makes future maintenance a lot easier. The block and beam floor will have PIR, ufh and covered in liquid screed.

The trades queried breaking the dpm both above and below the PIR but I was intending that the holes drilled would have round conduit pushed in to allow the wires and pipes to be fitted. Alternatively I could fit the conduit before any covering is put down but that would make it messy for the flooring guys.

Can anyone see a problem with this method?

 

[blup]

When you say access do you mean sufficient for a fully grown plumber to walk upright, or a child sweep. In other words how will it help future maintenance.

Blup

 

[RichD1]

The under void is about 6 feet deep with access holes to easily allow a worker to get through.

 

[Ivor Windybottom]

Pretty much any bathroom or kitchen has pipes through its dpm, if they didn't you'd need to tip it out of the window in a bucket.

 

[HERTS P&D]

Why not have a door in the garden going under/into the void under the extension?

Andy

 

[RichD1]

Why not have a door in the garden going under/into the void under the extension?

Andy

Yes, already done as part of the footings.

 

[blup]

The under void is about 6 feet deep with access holes to easily allow a worker to get through.

It makes sense to minimise intrusion from unsightly pipes to do as you suggest, some services inevitably go through the slab, just minimise opportunities for damp. And tell them you'll pay for the sds bit

Blup