Adding 12" To Casions

Jarrow

I'm adding 12" to existing deck casions where a landscaper has raised the dirt and covered the deck posts. The post have rotted so we are cutting them above the damaged bottoms and raising the casions.

The subcontrator will be mixing the concrete by hand on site.

My concern is this... i don't want the the new portion of the casions to fail in the future.

What kind of concrete mix should he use... I am concerned with honey combing and cracking where water may get in and cause the casion additions to fail.

Should he use aggregete in the mix... or is just sand ok?

would anyone suggest a concrete recepie?

any other tips?

thanks in advance!

genecarp

jarrow, there should not be a problem, quickrete makes a 5000psi bagged mix, that would be a good choice, just make sure you drill something like rebar into the top of the existing footing. here is a site that has some good bonding products if you are still not comfortable, but it is probably overkill, welcome to ct.

http://www.sanitred.com/ConcreteRepair.htm

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Bob Kovacs

As Gene said, I'd put some rebar down into the existing and extend it into the new. I'd also have the new top portion be larger than what's below it, essentially "capturing" the existing pier rather than just trying to extend it upward.

neolitic

This is one of the rare occasions where
I have to question you Bob.
Don't know where Jarrow is, but in this
part of the world creating a "collar" above
frost line is asking for trouble IMO.
Allowing the larger top portion to
"heave" off the lower section.
Collars on posts and footings are always
problematic from my obsevations in
this climate.

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Chris Johnson

This may sound like a lot of over kill, but make sure you bend a 180 loop on the top of the rebar and epoxy the bottom into the existing. Make sure the mix is not too dry and rod it into place to ensure it gets locked onto the rebar.

That puppy won't go anywhere

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Chris

wyoming 1

If you are worried about honey comb take a pad sander without sandpaper and use it to vibrate the outside.Do not over vibrate it or you may blow out( or swell) your sonotube.