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Old 08-11-2012, 12:05 AM   #1
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Stamped Concrete Patio


I’m having a stamped concrete patio put and in the contract it says 4” thick.

I was looking at the forms and noticed that they were 2x4’s and realized, “Hey, those are only 3.5 inches thick”. I got a string and measured the center and other areas thinking that maybe it was just edges were 3.5 inches. From what I can tell, in almost every place it’s almost perfect at 3.5 inches.

So is concrete thickness like lumber thickness with a nominal and actual? Should I say anything? The concrete hasn’t been poured yet, so I imagine it's a lot easier to fix it now than later.

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Old 08-11-2012, 09:57 AM   #2
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I’m having a stamped concrete patio put and in the contract it says 4” thick.

I was looking at the forms and noticed that they were 2x4’s and realized, “Hey, those are only 3.5 inches thick”. I got a string and measured the center and other areas thinking that maybe it was just edges were 3.5 inches. From what I can tell, in almost every place it’s almost perfect at 3.5 inches.

So is concrete thickness like lumber thickness with a nominal and actual? Should I say anything? The concrete hasn’t been poured yet, so I imagine it's a lot easier to fix it now than later.
No concrete is not nominal,get a better measurement by laying a 2x4 across the forms and measure down from there.

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Old 08-11-2012, 01:35 PM   #3
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Stamped Concrete Patio


Sounds like somebody measured wrong and set the forms 1/2" off. He/she will not be a happy camper but not your problem. Good you caught it.
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Old 08-11-2012, 03:49 PM   #4
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I tried using the 2x4 across the forms and I did get a different measurement. I was getting about 4.25 to 4.50 in some areas. I was only able to test in five different spots, but that seems good enough. I tired making the string as tight as I could and I got 3.75, so it must just be the string.
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Old 08-11-2012, 05:32 PM   #5
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I tried using the 2x4 across the forms and I did get a different measurement. I was getting about 4.25 to 4.50 in some areas. I was only able to test in five different spots, but that seems good enough. I tired making the string as tight as I could and I got 3.75, so it must just be the string.

Glad to hear it turned out alright,enjoy your new patio.
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Old 08-12-2012, 11:01 AM   #6
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Stamped Concrete Patio


Remember, 4" is ideal, but rarely will your whole slab be that thick. The contractor will do as much as he can to get the subgrade completely level and perfect, but in reality, some of the slab will be 5" thick, others will be 3 1/2. The top 1 millimeter is all you see, so if it doesn't crack, and you're not parking a 747 on it, if its a little thin in some places, its alright.
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Old 08-12-2012, 07:12 PM   #7
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The 1/2" in question here can easily be made up with a rake and plate compactor or tamp. No need to worry about it cracking thats a guarantee just be sure they cut control joints. GL

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