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Old 05-04-2009, 12:48 PM   #1
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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.

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Old 05-04-2009, 04:43 PM   #2
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How much Joist sitting on Sill plate?


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

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Old 05-06-2009, 05:11 PM   #3
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How much Joist sitting on Sill plate?


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).
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Old 05-06-2009, 06:08 PM   #4
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How much Joist sitting on Sill plate?


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
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Old 05-07-2009, 06:32 AM   #5
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How much Joist sitting on Sill plate?


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.
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Old 05-07-2009, 09:26 AM   #6
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How much Joist sitting on Sill plate?


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.
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Old 05-08-2009, 01:59 PM   #7
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How much Joist sitting on Sill plate?


Quote:
Originally Posted by Ron6519 View Post
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.
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Old 05-08-2009, 09:07 PM   #8
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How much Joist sitting on Sill plate?


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Originally Posted by Maintenance 6 View Post
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.
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Old 02-03-2010, 11:00 AM   #9
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How much Joist sitting on Sill plate?


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

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