Filling a small gap between a concrete countertop and a wooden counter

Old 09-12-22, 02:25 PM
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Filling a small gap between a concrete countertop and a wooden counter

Apologies if this question is better posted elsewhere, but my old man and I are new to working with concrete. We transferred a concrete countertop to a wooden counter base and a small crack formed down the middle of the countertop. The crack is barely noticable and the countertop is still structurally sound, but we only found out after the fact that the wood under it was not perfectly flat, leading to a small gap in between the concrete and the wood

Note: The wedge pictured on the left isn't increasing the gap size, as that is how big the gap was before we added it.

My dad is concerned that the gaps will cause the crack in the concrete to deepen, as the crack goes all the way through. Do you guys have any ideas on how to fill the gap? I mentioned some kind of foam like DRICORE, but he is concerned that it will expand too far and push it up. Is there a better alternative that doen't involve removing the countertop for fear of damaging it further?
The countertop probably weighs somewhere between 300-350 lbs
If other info is needed I can provide.
Old 09-12-22, 04:12 PM
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Those supports sure don't look to robust, hopefully they go all the way to the other side.

So is that gap in just an isolate spot? is it on the same side as the supports? Would pieces of shim stock be small enough to tap into the gap?
Old 09-12-22, 09:24 PM
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After the countertop has been properly shimmed, most countertop guys simply caulk the perimeter as needed with silicone. (Because silicone can be easily deglazed / cut out)

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