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-   -   How much Joist sitting on Sill plate? (http://www.diychatroom.com/f19/how-much-joist-sitting-sill-plate-43799/)

scott j 05-04-2009 11:48 AM

How much Joist sitting on Sill plate?
 
Building an addition and it looks some of the 12 ft wide (16 foot long) joists have only 1 inch sitting on the Sill (or upstairs wall). There is a joist running perpendicular which appears the joists are nailed into. Is it ok with only 1 inch of a 16 foot span is sitting on the plate but nailed into another 6 foot x 12 inch high joist that is also sitting on the Sill plate.

Also, which is better for a 16 foot joist span, solid wood blocking between joists or cross bracing at center (8 feet)?

Thanks for any help.

Gary in WA 05-04-2009 03:43 PM

1-1/2" minimum per 2003 UBC, IRC. Hanger them for load deflection on joists that long.

Bridging-- page 749: http://books.google.com/books?id=DWs...um=4#PPA747,M1

Be safe, G

VaViaCo 05-06-2009 04:11 PM

2 inches
 
Been framing for 15 years, have heard 2" bearing is the standard since year one. 3 1/2 inch plate, rim takes up 1 1/2, leaves 2 for the joists. The span isn't relevant.

Hang those.

Or if the sill is on block or concrete and there is room, add more sill under the joists. (pressure treated).

Gary in WA 05-06-2009 05:08 PM

As VaVia said, you should have 2" there, what happened?

In the UBC, '76, '83 and 2003, (ones I bought new), the minimum bearing on wood is 1-1/2", UBC 2320.8.2.

Be safe, G

Ron6519 05-07-2009 05:32 AM

When I do additions, I use a 2x6" sill plate, so you would have 4" bearing on the plate.
Why would you use a 2x4 as a sill plate. It seems skimpy to me to have the house bearing down on 2" of wood.
Ron

Termite 05-07-2009 08:26 AM

Bearing's been pretty well covered.

As for the question about bridging/blocking...
Cross-bridging or solid blocking at mid-span will work equally well. The nice thing with bridging is that you can still run plumbing and electrical through it.

Maintenance 6 05-08-2009 12:59 PM

Quote:

Originally Posted by Ron6519 (Post 270645)
When I do additions, I use a 2x6" sill plate, so you would have 4" bearing on the plate.
Why would you use a 2x4 as a sill plate. It seems skimpy to me to have the house bearing down on 2" of wood.
Ron

OP said it's a second floor joist. There are millions of homes with second floor joists bearing on 2" of top plate in the exterior walls. Sounds like some-one doubled the ring joist in a short area. That doesn't leave enough bearing. I'd use some joist hangers in that short span.

Ron6519 05-08-2009 08:07 PM

Quote:

Originally Posted by Maintenance 6 (Post 271254)
OP said it's a second floor joist. There are millions of homes with second floor joists bearing on 2" of top plate in the exterior walls. Sounds like some-one doubled the ring joist in a short area. That doesn't leave enough bearing. I'd use some joist hangers in that short span.

I guess I should pay closer attention to the details.
Ron

scott j 02-03-2010 10:00 AM

Hanger
 
Thanks all! City inspector said to just slide a hanger under it. Looks good.


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