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Old 08-17-2017, 07:06 PM   #1
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Sealing concrete blocks to minimize moisture wicking


I am building a pond fountain and using #6 concrete blocks as the fountain support wall (see pic). I will be applying a stucco coat over the blocks as a final step. In dry run tests, as you can see in the pics, the blocks wick up a significant amount of water that eventually evaporates, lowering the water level of the pond.

I need to minimize this wicking effect. Do I need to apply some sort of sealer to the blocks before I apply the stucco coat?

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Old 08-17-2017, 07:14 PM   #2
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Re: Sealing concrete blocks to minimize moisture wicking


It need to be water proofed below surface level, just like a house.
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Old 08-17-2017, 07:41 PM   #3
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Re: Sealing concrete blocks to minimize moisture wicking


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Originally Posted by Nealtw View Post
It need to be water proofed below surface level, just like a house.
Correct if the block are not waterproof from the bottom up the moisture may cause delamination of the stucco. All waterproofing will have to be a part of the stucco, stucco will not adhere to a waterproof block. You could look at some products like these Xypex additive for cement or the dry shake. STO has a product that I have use called Flexyl this is a foundation waterproofing material used in the synthetic system.
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Old 08-17-2017, 07:50 PM   #4
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Re: Sealing concrete blocks to minimize moisture wicking


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Originally Posted by ClarenceBauer View Post
Correct if the block are not waterproof from the bottom up the moisture may cause delamination of the stucco. All waterproofing will have to be a part of the stucco, stucco will not adhere to a waterproof block. You could look at some products like these Xypex additive for cement or the dry shake. STO has a product that I have use called Flexyl this is a foundation waterproofing material used in the synthetic system.
But this is a great picture for the people that don't believe water wicks in concrete.
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