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Old 02-28-2008, 06:28 PM   #1
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What are the joist requirements for a tile floor?


I've done some reading and question asking on this site and understand the basic subfloor requirements for tile, but what are the joist requirements? joist size, spacing, span? A friend of mine wants to add tile to an old farmhouse that is post and beam construction. It also currently has "farmhouse" wood plank floor boards as it's only floor! Can tile be installed over this type of floor, if plywood and cement board is added? Thanks

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Old 02-28-2008, 06:48 PM   #2
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What are the joist requirements for a tile floor?


Need to know the joist size, spacing and span, so the amount of deflection or flex can be calculated. And you will still need to add plywood and backerboard or Ditra

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Old 02-28-2008, 07:41 PM   #3
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What are the joist requirements for a tile floor?


Slatergirl, I assume these are 4"x8" beams 48" on center?
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Old 02-28-2008, 07:46 PM   #4
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What are the joist requirements for a tile floor?


if the floor flexes more than 1/8" in 10' then it probably needs beefing up (tile/joints will crack). that's just rule of thumb from memory, you can look up the actual allowable deflection in the building code books, its usually something like 1/360 of the span for members that generally span 14' or so.(when I say beefing up, I mean sturdier joists or smaller spacing)
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Old 02-28-2008, 07:54 PM   #5
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What are the joist requirements for a tile floor?


The only time that L/360 is going to come at 14' is with 2x10's. You're all missing that she said in her post-- this is post and beam. All the deflection tables go right out the window.

Let her answer my question, and then we'll see what we can do.
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Old 02-29-2008, 07:03 PM   #6
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What are the joist requirements for a tile floor?


My apologies, I posed this question without being fully prepared with all the info on my end. I'm trying to find out what size the joists are(not my house) and I will get back to you. thanks again
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Old 02-29-2008, 07:09 PM   #7
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What are the joist requirements for a tile floor?


Not a problem. If you could also find out how thick the planking is, that'd be great.
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Old 02-29-2008, 11:47 PM   #8
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What are the joist requirements for a tile floor?


.....and varify the beam spacing.
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Old 07-16-2008, 10:08 AM   #9
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What are the joist requirements for a tile floor?


And send us pics!

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