Replies

1. 
   JDRHI | Dec 12, 2005 08:20pm | #1

   Howz bout sistering with 2 x 10s instead?

   J. D. Reynolds

   Home Improvements

1. 
   barchiola2 | Dec 12, 2005 08:31pm | #3

   JD,

   I've thought about that but that woudl rob me of an additional 4 inches of headroom above the floor.  I've thought about nailing headers into the walls and hanging joists with metal hangers and scrapping the 2x6's altogether.  I'd still need the beam but I'd have stronger joists.  The problem with that, as I see it, would be that the hung joists might not tie the wals together like joists set on the plate.  I've never seen joists hung from the sides of the studs in any of the remodel work I've done so I'm inclined to think there's a reason not to do it that way.  I'l likely get an architect to run the numbers for me before I build anything but I thought someone might have more complete tables to offer me a quick 'back of the envelope' type confirmation.

   thanks,

   Bart

2. 
   SamT | Dec 12, 2005 08:27pm | #2

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   Edited 12/12/2005 3:26 pm by SamT

   
1. 
   barchiola2 | Dec 12, 2005 09:22pm | #4

   Hi Sam,

   Is that your reply?  A thumbs down?

    

1. 
   Sphere | Dec 12, 2005 09:29pm | #5

   I'd say it is, and add my thumb too. Definatly a Thumb down. 

3. 
   jonblakemore | Dec 12, 2005 09:35pm | #6

   I would want 2x12's @ 16" o.c. Even 2x10's would be pushing it, I think.

    

   Jon Blakemore

   RappahannockINC.com Fredericksburg, VA

1. 
   JDRHI | Dec 13, 2005 01:07am | #12

   Fer the record.....2 x 10s were suggested  in conjunction with a midspan beam.

   I should have been more clear.

   J. D. Reynolds

   Home Improvements

4. 
   mccarty12 | Dec 12, 2005 09:40pm | #7

   You could try some Light gauge steel joists. A 5.5 inch 97 mil joist at 50 KSI can span 21 ft. 9 in. at 12 in. on center or 19 ft. 9 in. on 16 in. on center. That is with a 30 psf Live Load.

   
   

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   Edited 12/12/2005 1:43 pm ET by McCarty12

5. 
   pickings | Dec 12, 2005 09:59pm | #8

   I'm willing to put a beam mid span but even 10 ft is long for 2x6's

   If you add the mid-span beam........

   2x6 @ 16" oc will carry 50 lbs/sf for about 8'-8". (40 lbs/sf for roughly 9'-6", and 30 lbs/sf for 10'-4")

   So... if you double them, AND add the beam mid span, ......2-2x6 @16" oc will carry roughly 60 lbs/sf for a 10'-4" span.

   You should be fine, but make sure there are no unknowns such as load carrying knee walls etc that add extra roof/wall/live/dead loads to the floor.

   PLease have an engineer size your beam, and double check the info above.

    

6. 
   erick | Dec 12, 2005 11:08pm | #9

   Ditto, with a properly sized beam down the middle doubled 2X6's should be fine.  However , instead of sistering and worrying about properly connecting, they seem to still be adequate @ 8" o.c. (HF #2),  basically dropping one in between, given 3/4" glued & screwed plywood.   Unless, like mentioned, there are other loads you've failed to take into account.  This should serve for planning purposes only, also like aforementioned have a engineer verify and sign off.

1. 
   JohnSprung | Dec 12, 2005 11:43pm | #10

   8" oc would reduce the span for your subfloor material, but makes no difference at all in terms of joist strength and deflection.  It reduces the space in the joist bays from 14 1/2" to 6 1/2", which will be a royal pain for any HVAC, plumbing and electrical work, not to mention blocking. 

    

   -- J.S.

    

1. 
   SamT | Dec 12, 2005 11:52pm | #11

   Uhm. . . John, ya maybe wanna rethink what ya just said?

   SamT

1. 
   JohnSprung | Dec 13, 2005 01:27am | #13

   Oh, yeah.  I meant 8" o.c. vs. sistered.  That would be the same for joist strength and deflection.  The joist bays would be 13", not 14 1/2". 

   Yup.  I effed up big time on that one.  ;-)

    

    

   -- J.S.

    

   Edited 12/12/2005 6:52 pm ET by JohnSprung

7. 
   Framer | Dec 13, 2005 02:47am | #14

   Is this a one car garage or two car garage?

   I've frame many additions over a one car garage where the ceilng joist run 20' front to back but the sides are 10' - 12' and I run the joists that way.

   If it's 20' x 22' and you do put a beam mid span and can't use double 2x6's all you need for the 10' span would be 2x8's sisterd along the 2x6's.

   Joe Carola
8. 
   MJLonigro | Dec 13, 2005 05:00am | #15

   Instead of a beam down the mid-span, is it possible to install two beam at 1/3 spans?

   That would give the 2x6's a span of 6'-8"..

    

1. 
   barchiola2 | Dec 13, 2005 05:48am | #16

   thanks for the input everyone.  it is a two car garage so a beam mid span is the only option as two beams would need columns right about where the cars would enter the garage.  I've been trying to keep from reducing the overhead space in the garage attic where I'd be creating living space so I've been trying to accomodate the 2x6's and or go with a different scheme lower down on the walls below the plate.  as we've seen, there hasn't been much support for that idea as i had kind of determined myself as well.  sistered 2x6's or 2x6's at 8" o.c. seems to be the answer but i'll get it confirmed before i do anything. 

   i really appreciate the help as i've at least got something of a plan now that i can build on (unintended pun).

   Happy Holidays,

   Bart

1. 
   hasbeen | Dec 13, 2005 06:53am | #17

   You might look into LVL to sister in, instead of 2x6.  Costs more, but more strenght and stiffness than a 2x6.Life and suffering are inseparable.   

2. 
   tennbuilder | Jan 08, 2022 07:57pm | #18

   Hello Bart, I ran across this thread. Do you remember what you decided to do??