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Old 01-25-2008, 05:42 PM   #1
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floor deflection?


How do you calculate floor deflection when installing ceramic or travertine flooring? Is there a formula for joist size, spacing, etc? Thanks for any info on this.

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Old 01-25-2008, 09:06 PM   #2
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floor deflection?


We use a span chart and enter the details. Do you have a specific job you're thinking of? Need to know the species, grade, size, spacing and unsupported span of the joists. Then the type, thickness and number of layers of the subfloor. Finally what you propose to install, where and how.

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Old 01-25-2008, 09:19 PM   #3
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floor deflection?


Thanks for the info Jaz. I am going to be putting tile in the kitchen, dining room, 2 bathrooms, and entry. Do you have a link or source where i can get a chart like that? Thanks again for your help
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Old 02-03-2008, 08:04 PM   #4
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floor deflection?


Jazman or anyone else with this info, Where can i get a chart like mentioned or find info on calculating deflection. I have a bunch of tile to do in my house and would like to learn how to calculate deflection. Thanks for any help.
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Old 02-06-2008, 09:44 AM   #5
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floor deflection?


http://www.johnbridge.com/vbulletin/deflecto.pl
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Old 02-06-2008, 03:07 PM   #6
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floor deflection?


Thanks bcoleman6, i actually found that site last night and was going to post it on here for others today. Jazman mentions subfloor thickness in his reply, do i need to worry about subfloors or just use this calculater and assume 3/4 sheeting with backerboard good for a subfloor? Thanks
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Old 02-06-2008, 06:26 PM   #7
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floor deflection?


ponch, You mention installing ceramic and then you mention travertine all in the same breath. They are two very different products with two very different requirements when it comes to subfloor requirements.

The 3/4" subfloor plywood if it is tongue and groove will generally meet the requirements for a ceramic install over 2 X 10 joists 16" on center. That is a basic safe point. Start changing the size of components and the requirements begin to change also.

Don't think for second that 3/4" ply for a subfloor is the answer to everything.

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