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Old 12-09-2013, 02:48 PM   #1
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Type of bolt for seismic retrofit


Hi there, I am looking to bolt my mud plate to my poured concrete foundation wall and I am not sure which kind of bolt would be best for my situation. As I understand, there are three main anchor methods for this type of work - undercut, wedge, and epoxy. The foundation is poured concrete, 90 years old, and is in good condition. The bolts I will be using are 5/8th diameter. What type of anchor method is recommended for old concrete? Thanks.


Last edited by Windows; 12-09-2013 at 03:36 PM. Reason: Clarity
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Old 12-09-2013, 07:20 PM   #2
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Type of bolt for seismic retrofit


are your bolts simple threaded rod ? if so, epoxy works well,,, i like wedge/lead anchors best,,, why so big ? we use 1/2",,, careful drilling holes so you don't blow out the edge & spall the conc,,, its a pita to repair,,, don't ask me how i know this - i just know

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Old 12-10-2013, 11:23 AM   #3
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Type of bolt for seismic retrofit


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Originally Posted by itsreallyconc View Post
why so big ? we use 1/2",,,
I read in several places that 5/8 or even 3/4 was the new recommended size for foundation bolting. Thanks for the tips.
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Old 12-10-2013, 11:38 AM   #4
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Type of bolt for seismic retrofit


i'm a bit fuzzy on the spec but isn't 5/8 - 3/4 the size for vert rebar 4' o/c ? jomamma or joecap may chime in later
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Old 12-12-2013, 06:23 PM   #5
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Type of bolt for seismic retrofit


Quote:
I read in several places that 5/8 or even 3/4 was the new recommended size for foundation bolting.
It is for new construction, where you have more control over foundation size and bolt placement.
Smaller bolts are preferred for retrofit.
1/2 for up to 2 stories, 5/8 for 3 stories.

Here is a link to Seattle's Retrofit Handbook.
http://www.seattle.gov/emergency/lib...assessment.pdf
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Old 12-16-2013, 01:02 PM   #6
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Type of bolt for seismic retrofit


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Originally Posted by Oso954 View Post
It is for new construction, where you have more control over foundation size and bolt placement.
Smaller bolts are preferred for retrofit.
1/2 for up to 2 stories, 5/8 for 3 stories.

Here is a link to Seattle's Retrofit Handbook.
http://www.seattle.gov/emergency/lib...assessment.pdf
Thanks for linking to this. I have read it, but could be useful for others.

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