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Old 04-09-2009, 05:47 PM   #1
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floor joist question


hi,
in my 10X12 shed with "loft," i was originally going to frame the room parallel to the 10' run, but changed it to span the 12' run.

i'm wondering, for the loft floor joists, do they now need to be 12'ers to run parallel to the rafters, or can the be 10s and run the other way, then just tie in the floor with blocking to the walls carrying the rafters?

i was hoping to get away with X6 or X8 on the 10' run, as it's just for a kid's clubhouse and future storage, not actually a full-out living space.

i'm suire all of you will tell me to do it to code and use X10s?

thanks.
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Old 04-09-2009, 05:54 PM   #2
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floor joist question


I used this calculator for my deck:
http://www.decks.com/Calculators/JoistSpan.aspx

it says, @ 16o.c.

2x6 - 9'9" max span
2x8 - 12'10" max span
2x10 - 16'1" max span
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Old 04-09-2009, 05:57 PM   #3
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floor joist question


Quote:
Originally Posted by johnnyboy View Post
I used this calculator for my deck:
http://www.decks.com/Calculators/JoistSpan.aspx

it says, @ 16o.c.

2x6 - 9'9" max span
2x8 - 12'10" max span
2x10 - 16'1" max span
thanks, my wall framing is at 2'OC. can i do 2X8 spanning 12' 2'oc? or should i set it up to do 16oc? 2'oc with 3/4" plywood enough?

thanks.
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Old 04-09-2009, 11:45 PM   #4
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floor joist question


2x8 - IRC- 24"= 10'3"

2x8- UBC- 24"= 11'3" 2003 code book

That's doug/fir #2. That's 40# live load and 10# dead load PER SQUARE FOOT. That will hold..... you do the math.

Be safe, GBR
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Old 04-10-2009, 08:48 AM   #5
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floor joist question


what is IRC and UBC?

so, a 2X8 fir (not spruce?) will span 12' just fine for the purposes of a 12 year old kid and a hammock, and future storage?

thanks.
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Old 04-10-2009, 11:37 AM   #6
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floor joist question


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Originally Posted by schmolze View Post
what is IRC and UBC?

so, a 2X8 fir (not spruce?) will span 12' just fine for the purposes of a 12 year old kid and a hammock, and future storage?

thanks.
International Residential Code (IRC)

Uniform Building Code (UBC)
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