sub floor rating


Old 02-14-04, 03:44 PM
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sub floor rating

Used the "deflect-o-meter" and found my 11' 2x8 are a L/377 rating

Does this deflection rating change with an additional 3/4" layer of plywood?

That would give me 1 1/2" of subfloor. Looking to increase the span deflection and get rid of some bounce!


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Old 02-14-04, 04:16 PM
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it will make it much better!What is your spacing?16" -19.2" -24"
Old 02-14-04, 08:02 PM
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There're on 16OC

Old 02-15-04, 07:36 AM
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What are you planning to lay on this floor, ceramic, porcelin, natural stone?
Old 02-15-04, 08:22 AM
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Tile sub floor

12" ceramic tile.

If I have a low area that will need slc, should I put it between the plywood layers or on top of the second 3/4" layer?

Old 02-15-04, 11:04 AM
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the problem is now you are adding another layer of weight to the mix and may cancel out any good the ply will do for the deflection and transfer that to the sag,2x8's are not very sturdy for a subfloor system.I think i would look at and rule out strengthening the floor from underneath before adding anything else to the top.
Maybe scabbing on to the joists from below or a dding another beam accross the joists maybe,don't know if thats feasible though
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