Missing Rim Joist - General Discussion - Contractor Talk

Missing Rim Joist

 
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Old 10-09-2020, 09:10 PM   #1
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Missing Rim Joist


I am wondering if any contractors have come across this type of construction or if it was even legal when the house was built. I have been a professional contractor for about 20 years and have never seen it. I believe the house was built in the 70's and is located in southern New England. I is a 2 floor home. The floor joist appear to end at the end of the sill with only the sheathing attached at the ends. No rim joist for stability??????
Any thoughts would be appreciated, Thanks
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Old 10-09-2020, 09:13 PM   #2
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Re: Missing Rim Joist


Does it have solid blocking?

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Old 10-09-2020, 09:38 PM   #3
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Re: Missing Rim Joist


My house in oregon is built with no rim joist circa 1976.

2-4-1 ply over 4x6 girders...

doesn't appear that it is going to fall down anytime soon.

pretty common out west here.
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Old 10-09-2020, 10:13 PM   #4
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Re: Missing Rim Joist


Quote:
Originally Posted by Half-fast Eddie View Post
Does it have solid blocking?
No blocking that I could see. It looks like 2x10's straight out to the plywood sheathing without any blocking.
The house belongs to a friend that I have know for 30 years that he and his wife bought a couple years ago. Unfortunately, I can't just casually mention my concerns and walk away. I thought that a rim joist was a requirement to stabilize the floor platform from any loads above it.
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Old 10-09-2020, 11:15 PM   #5
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Re: Missing Rim Joist


That sheathing attached to the joist ends does what a rim joist does.
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Old 10-09-2020, 11:35 PM   #6
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Re: Missing Rim Joist


Is it causing issues? If not and it's been like that for 40-50 years, why worry now?
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Old 10-10-2020, 12:11 AM   #7
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Re: Missing Rim Joist


You want it to be at least blocked continously, that's a shear transfer point from the floor diaphragm to the walls and also stiffens the assembly. As mentioned above if it's been there all this time will probably be okay but if you could slip the blocks in it's better
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Old 10-10-2020, 06:30 AM   #8
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Re: Missing Rim Joist


I never ran into that issue, but I came across when they used a TJI instead of a TJ Rim Board and they nailed a deck ledger to it and it pulled away from the house during a party when people were on it, luckily it was a small deck and didn't tip over all away.
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Old 10-10-2020, 08:17 AM   #9
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Re: Missing Rim Joist


Trade a bottle of bourbon for slapping a row of blocking in about twelve inches from the end of each joist bay and call it good man. Probably not necessary at all after forty plus years, but it won't hurt and maybe you sleep better at night?

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