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Old 09-09-2012, 11:47 AM   #1
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Avoid drilling tension slab


I want to install a new toilet that requires 2, 1.5 inch holes into slab to hold the toilet down. I was hoping to avoid the $450 dollars for an xray of the floor to ensure I do not hit a cable. Do they need to be that deep to hold the toilet? Is there a method for adhering the toilet to the tile instead?

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Old 09-09-2012, 12:00 PM   #2
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Avoid drilling tension slab


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I want to install a new toilet that requires 2, 1.5 inch holes into slab to hold the toilet down. I was hoping to avoid the $450 dollars for an xray of the floor to ensure I do not hit a cable. Do they need to be that deep to hold the toilet? Is there a method for adhering the toilet to the tile instead?
1.5" holes?

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Old 09-09-2012, 01:40 PM   #3
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Avoid drilling tension slab


Yes, the toilet ships with inserts that are actually 1 and a quarter, I just measured. Assuming 1/4 inches for the tile, I would be drilling 1 inch into the concrete slab.
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Old 09-09-2012, 03:58 PM   #4
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Avoid drilling tension slab


I'm sorry, I thought you were saying 1.5" diameter. I guess I didn't have enough coffee.
When I've worked with span-deck, I look for the hollow cores. They are usually lighter in color when looking at the panel surface. The cable will be in the darker areas and relatively shallow.
Assuming the flange is in a cell. Can you drill the 2 sides of the flange that are parallel to the cable?
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Old 09-09-2012, 04:23 PM   #5
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Avoid drilling tension slab


most toilets mount to the closet flange and don't involve drilling. what kind of toilet is it?
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Old 09-09-2012, 04:29 PM   #6
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Avoid drilling tension slab


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When I've worked with span-deck, I look for the hollow cores
More likely than not, the floor is a post-tensioned slab, not a span-deck. If you have the structurals, you could see if there are even any tendons in the vicinity. I've been on PT slabs where the cables were everywhere, and I've the slabs where the cables were surprisingly sparse and massed all together.

The standard in commercial construction is to not penetrate the slab more than 3/4" with fasteners. Then you can drill at will.

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