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If you had to choose between 2" and 2.5" thick concrete countertops, which would you opt for and why? Side note: I've heard that if you go bigger than 2" you need to start adding rebar, etc

  • More important than the thickness is where you place the reinforcement. Concrete handles compression well, but breaks easily if stretched. A section that overhangs the support will be stretched on the top surface and compressed on the bottom, so the only reinforcement that will help there is close to the top surface. If it is between supports so it will want to sag in the middle, the most stretching will be on the bottom, so that's where reinforcement needs to be. This would be in addition to measures like fiber for general strength. – fixer1234 May 10 '17 at 19:58
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I'm going to call this an aesthetic choice. But a bit of remesh/rebar wouldn't hurt, especially in a 60" long chunk or around a sink opening.

Personally, I'd find 2-1/2" overly heavy.

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If you use fibreglass mesh (on a roll), you can make the thickness 40mm, which would be much lighter, & easier to handle.

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i would choose 2.5" because peanuts are crunchy

  • As in you don't think it really matters as far as adding rebar or supports? It's $100 cheaper to do 2"... can you tell we're budget conscious? Haha – Jake Schmitz Feb 24 '17 at 4:09
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    Weather It's 2 inch or 2 1/2 inch it still should have some metal support in it. At minimum metal lath. I would do 2 inch with quarter-inch rebar. – Alaska Man Feb 24 '17 at 9:04
  • Didn't know they made 1/4" rebar... will look into it! – Jake Schmitz Feb 24 '17 at 16:48
  • I have used chicken wire for years. Stagger 2 layers and you have really good coverage. One of the earliest counters I made (tile with 1-1/2") bed had to be removed because of termites. I did the original job over 30 years ago. The support structure had started to fail but the counter top was still intact. I still do custom work this way for countertops including the few polished concrete countertops. Off topic but check out glow stones I have added them to the last job I did and will be using these on my future projects, just like mini built in night lights. – Ed Beal May 10 '17 at 19:28

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