[oh'mike]

I just left a house with a small bump out bathroom--

The floor joists are only 6 feet long--2x6 -16" centers hem/fir from the 1960s.

Can any one tell me the deflection?

 

[Msradell]

In a case like that how the 2x6s are attached to the rest of the structure are probably going to make just as much difference as a deflection of them themselves. I can tell you right now that from experience I certainly wouldn't have built a 6' bump out with 2x6s for joists! It's just not something I would feel comfortable doing even if they meet the code requirements which I'm not sure they even do.

 

[oh'mike]

I don't like the 2x6 joists either---but it is what exists---I have not torn into the work yet--what I can see ,the carpentry work looks adequate--the floors are still flat and level after 50 plus years---

 

[LanterDan]

There are numerous online defelction calculators, the one I use is here.

Using unknown wood/good condition gives: L/642
Using SYP or Douglas Fir gives: L/839

There are other calculators with permit a wider choice of lumber species.

Bump out to me usually implies cantilevered, but I'm assuming this isn't a 6 ft cantilever.

Maybe this is a diy/ignorance is bliss opinion, but I'd lay tile on that (with appropriate subfloor) without hesitation if that is the question. My parent's old kitchen had addition to the kitchen of comparable dimensions and 2x6 joists. I put down tile 10 years ago and it was fine when the sold it two years ago.

 

[JazMan]

I just left a house with a small bump out bathroom--

The floor joists are only 6 feet long--2x6 -16" centers hem/fir from the 1960s.

Can any one tell me the deflection?

No Mike, I can't tell you the exact deflection but I guarantee those joists are plenty stiff enough for any tile installation.

There are at least two species of hem/fir, (reg. and north), and at least 6 grades. But even the worst grade which is "stud", you're well over L720 and I'll guess close to L1000.

BTW, is the actual span 6' or is that the length on the joists?

Jaz

 

[oh'mike]

Thank you all for the help. I couldn't find such a short joist on the chart that I use.

I will see the property again soon --it is not a cantilevered structure--full foundation under the little bathroom---

 

[Gary in WA]

229# per lin.ft. at L-360 deflection. Doug./Fir 1600, http://www.awc.org/codes-standards/publications/wsdd-1986_1992revisions

Gary