Hi.I have a question about how rebar is supposed to connect in a
monolithic slab.I want to put down a 16" grid of #4 rebar in the slab and
connect it to a 18"wide x 24" deep footer.Is there a diagram of this
available somewhere to see the connections?Specifically the part of
bending the rebar to meet up with the 4 rebar runs that will be in the
footer. I live outside Fairbanks Alaska,and there is no code
here,however,I want to build a strong foundation.I'm just a little
confused with what this network of rebar should look like at that part of
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On May 11, 6:59 pm, rrenfro4_at_cfl_dot_rr_dot email@example.com (Stitcher)
Just put a 90deg bend the slab rebar with a ~18" tail on it and run it
down into the footer.
(make sure you have at least 4" of concrete between the bottom of the
footer and ends of these down facing rebar)
I'd run a horizontal rebar in the footing at the 90 deg bend. And
another horizontal piece at the ends of the 90 deg bends.
I'd probably do double 90's (out of plane) so the vertical tails also
had some splice length with the lower horizontal rebar.
But all this aside.....Fairbanks has a pretty deep frost depth. A
footing that is only 24" deep (unless heated / insulated) or on a well
drained base is going to be at risk for frost heave.
Better check out cold environs foundation design before you waste a
lot of time & money.
You use the term slab. How thick is this slab? A grid of #4 bar
requires a minimum of a 5" slab, 6" preferred. A slab is usually
NOT fastened or pinned to a footing, in fact they usually have an
expansion joint to allow slight separate movement.
If they do need to be tied, simple right angle bars would be the
norm. 24" depth of footing won't work in over half of the
continental US, I cannot envision it working in Alaska at all.
Keep the whole world singing . . . .
Would a 24" footer be OK, due to the permafrost in AK? Once you get
past the top surface than thaws and refreezes and you hit permafrost
it's like buiding on bedrock is it not? Just guessing here.
Remove 333 from email address to reply.
Sure it will... They are called an "Alaskan Floating Slab". In fact,
you don't even need 24", usually 18 is sufficient. The inside edge
must be tapered however.
There are many good writeups on floating slab construction on the web.
What are you putting on this slab? #4 MAY be overkill.
Don't usually tie a slab into a footer but you have to determine if it is
Need a deeper footer than what you want and don't depend on the slab to hold or
What are you putting on the slab? Do you need drainage around the footer?
Tekkie Don't bother to thank me, I do this as a public service.
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