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Old 06-28-2010, 06:25 PM   #1
KCB
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1960's slab house


Hi all , central Kentucky area .
Ive started a 16x30 room addition and have dug the footers
at 28" (24" is frost line) . The problem ive encountered is the original footer is at 18" so im approximately 10"s lower than the original footer.
What is a work around tie in to join these 2 footers?

Last edited by KCB; 06-29-2010 at 06:45 AM.
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Old 06-28-2010, 11:06 PM   #2
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Why do you want to tie the two footers together? I am guessing you did not get a permit, maybe you don't need one, so this doesn't sound like a code issue. As long as you are on adequate soil, and the footers are properly built, you gain absolutely nothing by tieing the two foundations together. As long as the original foundation is working, you should be able to build the two foundations independently.
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Old 06-29-2010, 06:37 AM   #3
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all the literature ive studied suggested it , and yes i have all the needed permits .
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Old 06-29-2010, 05:48 PM   #4
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if you want, drill into the existing vertical end & epoxy deformed steel into it extending 18" into the new conc,,, i'd probably use 4 if it were ours.
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Old 06-29-2010, 06:28 PM   #5
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The footers are at two different levels, so in order to tie the two footers together would required Z shaped bars. I cannot see what possible structural value that would add. As for the documents you read that recommended this technique, they may have been referring to two footers at the same level, or possibly to an initial pour of a multilevel footing, I don't believe they were referring to retrofitting bars into two distinct footers that are on different planes.
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Old 06-30-2010, 06:02 AM   #6
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Ive not read any documents concerning this problem.Ive read plenty concerning footers of the same depth . Thats why i posted here for solutions .There may or may not be an issue here but my thoughts of joining 2 footers is to "prevent/minimize" over time' sagging of 2 different structures,10/20 years down the road.Or at least settle together with minimal movement .
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Old 07-03-2010, 08:11 AM   #7
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if you want, drill into the existing vertical end & epoxy deformed steel into it extending 18" into the new conc,,, i'd probably use 4 if it were ours.

That was our first thought "and is what we ended up doing using 2 rods" .
The Code inspector said we didnt have to join the footers .But replied "the more support the better"
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