Rebar Or Wire Mess In A 4" Slab?

tikicarver

I was reading another forum were several guys were saying they never use rebar in a 4" slab. Then others said it was much easier to keep rebar centered in the slab during the pour.
I'd be interested to hear what others do.

Chris Johnson

Depends on engineer specs...

Earthquake country everything is rebar here

Mesh if your not watching the guys will squish it down under the pour rendering it useless, rebar if pushed down is easier to lift and get back into the mud where it belongs.

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A.W.Davis

Rebar here in Cali

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A W Smith

Ive never seen rebar in a four inch slab on any jobs Ive done over the years. Always WWF that we pull up with a rock rake.

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A.W.Davis

Theres clearly a variation in how the east coast and the west coast do things.

Here in Cali we use rebar set on "dobies" and tied together in a staggered pattern.

I have seen sidewalks "buckle" in the summer from high heat. We had a job like that last summer.....turns out upon demo of the sidewalk it had the wire gridding in it instead of rebar.

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A W Smith

We call "dobies" "chairs".. Are you using #3 rebar or #4? or pencil rod?


Saw your sidewalk example edit

A single layer of reinforcement will not prevent a sidewalk from buckling as they do not run through the expansion joint. Expansion joints must be at a minimum 10 feet apart for sidewalks to prevent that heat buckling. But if it happened in a crack in the slab you would need to set your reinforcement staggered on double height chairs to prevent that.

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A.W.Davis

It all depends on what we are doing and the spacing of the rebar grid. Usually we use #4 rebar at 12" o.c. so we dont have to tie as much.

Never heard of chairs before. I am old fashioned I guess and would probably still prefer concrete dobies. Just my .02 cents

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neolitic

Yeah, back here we kind of expect our ground
to stay still and not get the heebie-jeebies.
4" slabs get 6-6-10-10, and the little thumb "thingy"
on the back of the come-a-long pulls it up as you pour.
Are "dobies" what we call concrete brick?
That's what we lay mats on.
I've never used chairs except for deck pours.

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(Sorry....it seems there really are dumb questions)

Cole

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