Breaking through DPC

[LFB531]

I'll try and explain what I'm up to without pics....

1970's bungalow, solid (concrete) floor. Shower tray raised on previous install to keep waste above floor. New one needs to be sat on the floor so trench needed.

Waste exit will be just below wall DPC level and as space is tight, it could well break the barrier. Also I've no idea where the DPC has been put in the floor so I may well have the same issue when I grind out (the trench will be about 90mm deep). Once complete, the floor will be tiled.

Can I/should I be looking at some form of repair if any is damaged and if so, what/how?

Any input very much appreciated.

[TA14]

I'd be surprised if the floor has a dpc.

[Rosscow]

TA14 said:

I'd be surprised if the floor has a dpc.

Would you? I thought DPM's have been pretty standard since the late 60's.

I know that my in-laws house (which they built in 1974) has definitely got a DPM below the slab.

[Eddieslofart]

Might have a coat of blackjack on it, that'll be about all.

[kambites]

Are you sure the floor is solid rather than block-and-beam?

[LFB531]

Progress then, trench for waste trap dug out now and reveals just concrete so no problems there.

I'll see where we get to with the exit through the wall.

Thanks btw!

[TA14]

If in doubt I'd tend to go slightly deeper. I assume that you'll backfill with a granno mix? Easy to backfill an extra 20mm.

[SAB888]

Rosscow said:

TA14 said:

I'd be surprised if the floor has a dpc.

Would you? I thought DPM's have been pretty standard since the late 60's.

I know that my in-laws house (which they built in 1974) has definitely got a DPM below the slab.

Concrete floors with DPMs were getting more common during the 60s, so I'd be surprised if there was no DPM in a 70s house with a concrete floor.