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Old 01-18-2014, 01:31 PM   #1
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A few questions about basement bathroom flooring


The cement floor in the basement has been cut out to lay pipes for plumbing a new bathroom. I have a couple questions about it.

1. After they refill the hole with cement and make it level with the rest of the floor, will the new concrete shrink as it dries? If so, is there something they can do to keep the new cement from sinking down below the level of the existing cement floor?

2. Before pouring the fresh cement into the hole, should the edges of the old cement be coated with a bonding agent so that it will adhere to the old cement?

The reason I'm asking is that if I lay some kind of tile on that floor, I don't want the grout lines or tiles to crack, if it can be prevented.

Barb
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Old 01-19-2014, 11:54 AM   #2
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i did the same thing, relocating a pipe, over a year ago. . i used regular sakrete with nothing else. the patch looks as if it were done last week.

did they "cut" the hole, or break it out ?
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Old 01-19-2014, 03:38 PM   #3
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Thanks Fix'n it.

They cut it with a saw. If yours has turned out alright and looks good, I won't worry about it.

Thanks again!
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Old 01-19-2014, 08:00 PM   #4
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i didn't cut mine with a saw. i busted it out. this makes a big difference. when the hole has smooth sides, the patch won't grab as well (if at all, idk). with a busted out hole, the sides are very rough and jagged. this gives a very good surface for the patch to grab onto.

know what i'm sayin ?
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Old 01-19-2014, 11:43 PM   #5
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That makes sense. When the guys come to work on it again, I'll bring it up to them. Maybe I'll grab a bottle of the bonding agent at Lowe's tomorrow and ask them to use it.
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Old 01-19-2014, 11:59 PM   #6
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Quote:
Originally Posted by gma2rjc
That makes sense. When the guys come to work on it again, I'll bring it up to them. Maybe I'll grab a bottle of the bonding agent at Lowe's tomorrow and ask them to use it.
Bonding agent won't hurt so if I were you, I'd tell them that I wanted it used whether they thought it was necessary or not. It's your house and your job.
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Old 01-20-2014, 12:29 AM   #7
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Thanks Dave Sal. Do you think it would be necessary to add some rebar too, since the new cement will be up against the smooth cut cement?
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Old 01-20-2014, 01:06 AM   #8
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Quote:
Originally Posted by gma2rjc
Thanks Dave Sal. Do you think it would be necessary to add some rebar too, since the new cement will be up against the smooth cut cement?
I just read a link on another forum about your exact question. One of the posters suggested renting a roto hammer drill and drilling holes every 16" on both sides. Add rebar dowels in each hole and this will lock the new concrete to the old. Seems that most don't think it's necessary and is overkill though.
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Old 01-20-2014, 07:26 AM   #9
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Quote:
Originally Posted by Dave Sal View Post
I just read a link on another forum about your exact question. One of the posters suggested renting a roto hammer drill and drilling holes every 16" on both sides. Add rebar dowels in each hole and this will lock the new concrete to the old. Seems that most don't think it's necessary and is overkill though.
If this were mine this is what I also would do, the rebar will be added security that the concrete will not sink at a later day. Or have them cut a ledge for the concrete to sit on. JMHO
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Old 01-20-2014, 09:29 PM   #10
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the way i busted mine out, it left a sort of ledge. the edge of the hole, i shaped it in a rough V shape. the patch concrete fills around this, making a tongue and groove setup. once dried, the stone under it could be removed and it wouldn't effect the patch.
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