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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7323
Experience:  Structural Engineer
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What hardware and spacing is required to bolt a framed house

Customer Question

What hardware and spacing is required to bolt a wood framed house to the foundation in california
Submitted: 2 months ago.
Category: Structural Engineering
Customer: replied 2 months ago.
For earthquake retrofit
Expert:  StructuralEng replied 2 months ago.
Hello
Customer: replied 2 months ago.
Hi there
Customer: replied 2 months ago.
Customer: replied 2 months ago.
What fasteners are needed and how much space is permitted between them?
Expert:  StructuralEng replied 2 months ago.
There is not a simple answer to that without doing a full lateral analysis. I could approximate it, but to get it precise you would need the lateral analysis
Customer: replied 2 months ago.
Ok, sure. what information would you need for an approximate estimate?
Expert:  StructuralEng replied 2 months ago.
The square footage of the home and the number of floors.
Customer: replied 2 months ago.
900 sf single story. Crawlspace tapers from 6' at front of house to 18 inches at rear
Customer: replied 2 months ago.
Will you be able to get back to me with an answer today?
Expert:  StructuralEng replied 2 months ago.
I'm working on it now.
Expert:  StructuralEng replied 2 months ago.
There is a lot more to it than just making sure it's connected with anchor bolts, though. Just to be clear
Expert:  StructuralEng replied 2 months ago.
Assuming you have a mechanism in place to deliver a uniform shear to the wood plate, you can plan for 5/8" has rods wmbeddes in the concrete at approximately 4' on center around the perimeter.
Customer: replied 2 months ago.
Got it, I know that it also needs a shear wall and possibly some other engineered solution to be really earthquake safe. But the bolting is a good start and I will probably hire someone to take a look at it and make a plan for the shear
Expert:  StructuralEng replied 2 months ago.
Great. Good luck with your project
Customer: replied 2 months ago.
Thank you! Just to specify, 5/8 galv threaded rod with 2 part glue or expansion anchors and large square galvanized washers, correct? How long do the rids need to be?
Expert:  StructuralEng replied 2 months ago.

That was based on 1/2" threaded rods with 6" embedment in Hilt Hit HY 150 adhesive.