a similar such connection of members, than a repetitive member factor is
not appropriate.
BTW, my own home's interior subfloor consists of 1955 installed flat 2x6
T&G supported at 48" OC and it performs very well even when I had the
finished floor stripped off. I'm a pretty big guy and it felt solid
hopping up and down. I have put tile down in some areas with just 5/8
ply screwed down plus 1/4 hardiebacker and there is no cracking
whatsoever in the tile.
Andrew made some great points and I second all of them, especially the
water proofing disclaimer note. I agree that most if not all wood floor
systems should generally have designs governed by serviceability not
stress controlled though stresses need be checked. Personally for this
balcony I would be thinking 24" OC supports but if the 2x6 were
installed in double or triple span pieces I wouldn't be surprised to
have 48" spans performing well. I'm no decking guru so on one of my
projects I would be sticking with 24" OC max until the architect,
contractor or owner challenged it.
If you do some calcs you will see stress can work to at least a 5-6' SS
span. I remember a renovation I did on an older building with existing
flat 2x6 T&G subfloor spanning 6' at an upstairs corridor, surprisingly
it felt good and solid when walked/jumped on though it did have 1"
diagonal wood flooring attached directly as a finish that probably
contributed.
Donny Harris, SE
California
From: Drew Morris <dmorris@bbfm.com>
To: seaint@seaint.org
Subject: Re: Pressure Treated Decking
The 2005 NDS (4.3.8) has the following for the incising factors:
E, Emin 0.95
Fb, Ft, Fc, Fv 0.80
Fct 1.00
These values apply when the piece is incised top a maximum depth of
0.4", a maximum length of 3/8" and a density of incisions up to 1100
/ft^2.
I think you could also apply the repetitive factor that would offset the
incising factors some.
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