coping remodel, new mastic question

pamprais

New member
Apr 23, 2024
3
TX
We had Oklahoma stone on our original coping and are replacing it with travertine. Can someone refer me to industry standards for the width of the mastic? I thought I had read somewhere that it was 3/4" but want to confirm that. Is there a "standard"? We live in Texas
 
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I like to see a gap that's ½-inch wide between the deck and the coping. The gap should extend downward through the entire depth of the slab, usually about 4 inches.

 
Can you tell me if there is an industry standard? We are in Texas and our contractor said that a 1 1/2" gap is fine... trying to argue that it could compromise the joint with extreme weather or land shifting.
 

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There are no industry standards on coping and decking.

The main problem with joints that wide is it uses much more mastic and foam rope to fill the joint.

I don’t see how weather has an effect on a wider joint. And if anything a wider joint is a benefit if the land shifts. So I think you need to give your builder better reasons why you want things redone which will be difficult once the coping and deck are installed.
 
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