Steel Floor Joist

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  #1  
Old 04-13-04, 05:56 PM
haad
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Question Steel Floor Joist

We recently purchased a house that was built in the early 70's (move in June) that has I believe 10" - 12" steel 'C' joists, that are 24" on centres, over a 14'0 span. The sub floor is plywood, not sure of the thickness, that is screwed to the joist with self drilling screws. We want to put ceramic down, but I am concerned about the 24" centres. Is there a way to "beef" up the floor? Any suggestions or experience in this would be appreciated.

Thank you

Angelo
 
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Old 04-15-04, 10:34 PM
S
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Depending on the thickness of subfloor, you might not have a problem.


Some Sturdi-Floor sheathing is rated for 48" o.c.
 
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Old 04-23-04, 12:56 PM
haad
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Thanks for the reply.

I visited the house again, and the joists are 7-1/4", sub floor is I believe 5/8" plywood, not chip board.

Angelo
 
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Old 04-23-04, 01:09 PM
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if it is plywood

5/8" thick on 24" centers I wouldn't tile it. Either place an addtional layer of sheathing or come up with another floor covering.


I don't think the joists are the problem just the subfloor!
 
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Old 04-23-04, 01:17 PM
haad
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Thanks for the quick reply.
Another 5/8 T&G on top should this suffice??
Height is not a problem as we will be doing basically the whole level.

Thanks

Angelo
 
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Old 04-23-04, 07:49 PM
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What's the total area you're thinking about tiling? Also, what's the span of the joists? The distance between supports under the them? Need to know these numbers also to determine correct deflection ratio. I think you'll need to add at least one more layer of 5/8" exterior grade plywood & then a layer of some kind of backer, cbu might be your choice or might think about ditra, but I think this can be done. How big a tile were you thinking about?

Post back with those answers & we'll go from there.
 
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Old 04-24-04, 06:11 AM
haad
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| |
| |
| | 13'6"+- span 24" on centers
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============= support beam
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| | 13'-6"+- span 24" on centers
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<---28'0" +- ---->

There is a dining room of 13'0" X 12'0" that is part of the above that will not have tile, so approx 600 sq ft. 12" or 16" x 1/4" ceramic tile .

Angelo
 
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