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Old 12-05-2013, 11:17 AM   #1
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Advice regarding concrete floor


I have my 2nd floor bathroom down to the studs in my 87 year old home. Now facing a decision on whether or not to take a jack hammer to the two inches of concrete in the floor, or simply remove the existing tile, and retile. I have some of the tile removed now. This is the only chance I will want to take to bust up this floor, but will gladly avoid it if there is no good reason for it. Welcome any thoughts and/or advice.
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Old 12-05-2013, 11:25 AM   #2
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Are you talking an old fashioned mudbed with tile on top, or are you talking actual concrete floors?
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Old 12-05-2013, 11:49 AM   #3
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It looks like concrete. You can see the area in this pic where I have broken up some of the tile. The open area is where the tub had been located


Advice regarding concrete floor-image-3792919170.jpg

Last edited by dgfit; 12-05-2013 at 02:22 PM.
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Old 12-07-2013, 07:34 AM   #4
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Any thoughts?
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Old 12-07-2013, 10:32 PM   #5
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Old 12-08-2013, 12:06 PM   #6
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Not sure why your thread hasn't been replied to.
Joe must be napping.

Hard to tell from here. Lots comes into play.
Is it cracked, sloped, flat etc.? My first thought
is to get rid the mortar bed, repair/update
any structure/plumbing/electric and install 3/4
advantech for subfloor.

But I'm not there.
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Old 12-08-2013, 09:43 PM   #7
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I don't have the tile up yet but it seems to be in ok shape. But I think I have decided to take it up - why do it part way. I am also in the process of replacing all water lines, complete rewire and upgrade service (all with permits).
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Old 12-14-2013, 09:39 AM   #8
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It's always better to take things back to the studs/joists and start over.
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Old 12-14-2013, 12:31 PM   #9
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I agree... especially with older houses that tended to over-span the joists before building codes. Your joists may be fine for the loads or not; the water supply/drain line are run to the closest wall below (across the room pictured) telling me the span to the other joist-bearing wall may be greater; the total span may be 10-12'- if so- a 2x6 will span 8'11" if Doug-Fir #2 (20# load); http://publicecodes.cyberregs.com/ic...002_par017.htm

Which brings me to my point (finally)...you have a lot of weight on the joists (not counting bathroom fixtures- sink, toilet-) of materials;

1" reinforced regular weight concrete =12.5# per sq.ft.
1" plain lightweight concrete (1) = 8#
7/16" cementitious backerboard = 3#
Ceramic or quarry tile (3/4") on 1/2" mortar bed (1)= 16#
Ceramic or quarry tile (3/4") on 1" mortar bed (1) = 23#
1" mortar bed = 12#
1" slate (1) = 15#
3/8" marble tile = 6#
3/8" ceramic floor tile (1) = 4.7#

Pick yours and add them up- compare to span charts- remember to add P&L at 8#per sq.ft. attached below the joists.....

Gary
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