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Unread 02-21-2013, 06:24 PM   #1
ttown419
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Join Date: Feb 2013
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Ceramic Tile on Plank Subfloor?

Hello,

I am thinking about installing 12"X12" ceramic tiles to replace the (what appear to be original 1950) 1"x1" tiles currently in place in my 12'X5' bathroom. Underneath the existing tiles is a mud bed (1 inch thin-set, wire mesh, felt) which leads to a plank sub-floor. The bathroom is on top of a basement. Joist dimensions are in good condition, 9" height, 1.5" width, MOST are 16" on center (some are closer), and length is 15'. I used the Deflect-O-Lator and it shows that my sub-floor is not suitable for ceramic.

Is there a way to 'beef up' the floor before installing 1/2" plywood followed by backer board?

Any other ideas?

Thank you for any help you can provide.

Dan
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Unread 02-21-2013, 06:28 PM   #2
reefone
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you will need to add a wall or a support beam in the basement to cut down on the span of the joist or sister new joist along the old ones.
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Unread 02-21-2013, 06:40 PM   #3
ttown419
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Thank you, Jerry.

Would you recommend running the sister joists the full length of the current joists, or any other method besides adhesive and nails?
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Unread 02-21-2013, 07:02 PM   #4
reefone
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sisters need to be at least 2/3rds of the middle of the joist. glue and screws is the way to go.
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Unread 02-21-2013, 07:03 PM   #5
jadnashua
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To gain the required strength, you need to sister at least the middle 2/3'rds of the joists. More is better, but that is enough. That gives you a litle leaway to maneuver them in place, too.
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Unread 02-21-2013, 07:10 PM   #6
ttown419
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Thank you Jerry and Jim!!
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