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Old 11-29-2008, 11:33 PM   #1
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Can I safely cut through my foundation?


Our home was originally designed with one room, first floor, as either a study or as a bedroom. If it was designated as a bedroom, then the adjoining bathroom was complete with a shower.

We chose, at the time of construction, to use the room as a study and the bathroom was built with a closet rather than as a shower.

We would now like to convert the closet to a shower. The south wall of this closet is the back of the shower for the master suite. The water supply for the master shower is in the wall between the two rooms (master shower/second bath closet). A plumbing vent is also in this shared wall.

Connecting the water supply for the second shower presents no problem.

Our problem is there is no drain in the closet. I'm considering breaking through the floor of the closet and connecting a drain into the vent of the master shower.

Our slab is a post-stressed slab and is 15 years old therefore it is quite hard.

My questions are:
1. What risks are associated with cutting a hole, through the slab, that is large enough to gain access to the drain system?

2. Will a connection to the vent properly serve as a drain to the shower?

It has been suggested that I just break out enough space in the floor to install the p-trap so that its exhaust runs across the floor to a connection in the vent, about 18" away. That would mean raising the floor of the shower considerably. I don't like that solution, but I'm not excited about cutting a 20" hole in my foundation.

Thanks for you assistance
grubby

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Old 11-30-2008, 12:53 AM   #2
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Can I safely cut through my foundation?


Cutting into a post-tensioned slab is definately not a DIY job. If you cut into a cable tendon, you'll have a slab failure at the least, and a bad injury at the worst. They're nothing to mess with.

I never advocate raising a shower to facilitate draining it above the slab, but in this case it might be a good idea.

I wouldn't say it would be a good idea to use the master shower's vent as a drain, although it might work. Hard to say without actually looking at it.

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Old 12-01-2008, 05:08 AM   #3
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Can I safely cut through my foundation?


Agreed with thekctermite...Do not cut your concrete floor...Do your shower drain p-trap above the floor there now and build up the new floor to suit...The vent is also a drain so it should work long as you set a p-trap in the line to it to stop sewer gas backing up in the shower...

The low cost to rough in these abs pipes before pouring the concrete slab is well worth it...
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