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Old 03-24-2008, 03:53 PM   #1
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4" patio construction

I am wanting to add a 12'x15' patio to my house this spring. I feel capable of doing the work, but am unsure of one thing. Does a 4" slab that is 12'x15' need to be tied with rebar? if so, what size would i need?



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Old 03-24-2008, 03:59 PM   #2
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I would just use welded wire mesh (6x6) and cut one joint to keep the panels about the same size.

Lazy people do not like mesh, but if it is placed properly and has some coverage underneath, there is noting better. It should ne in the bottom half of the slab.


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Old 03-24-2008, 04:43 PM   #3
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i'd be cutting 2 joints,,,

otherwise you'll get 2 pieces of conc measuring either 6'x7'6' OR 7'6"x12',,, either will be VERY susceptible to random cracking at or near the mid-point,,, conc likes to be square,,, if i remember right [ hardly likely at my age, anymore ], seems i recall amer conc institute specs saying a slab should be no longer'n 4x's its thickness when express'd in feet,,, hopefully someone's got a better memory but, it it were mine, we'd cut 2 control jnts 1" deep ( thickness / 4 ).

mesh only adds strength when the slab is in tension ( curing ),,, after that, it holds the broken pieces together { an old dot inspector's joke/observation ],,, rebar would add structural strength but its o'kill on such a small project,,, mesh, again according to aci, should be installed 1/2way vertically =/- 5%,,, if you're ordering redi-mix ( approx 2.25cy), add fiber,,, you'll get a ' hair finish ' but its easy to burn off w/propane burner & 20# tank.

we rarely see rebar ( #4 - 1/2" ) spec'd in 4" slabs,,, 6mil vapor barrier, yes,,, this link may help - in laymen's language:

most of the conc that i see gone to **** is because jnts were not properly installed/placed/cut/sawn/grooved.

w/a top of the hat to concmasonary, just my $0.03 - its your conc
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Old 03-25-2008, 01:05 PM   #4
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learning already

thanks for your responses. I am picking up specifics I need. Thanks.
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