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Efflorescence on slab


DonTx
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We've had quite a bit of rain lately, however I hardly ever see efflorescence like I found on these two homes. The last picture is from a slab that the builder added a layer of skim coat on to hide the honeycombing.

Could this be caused by a lack of a moisture barrier?

Donald

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Originally posted by Donald Lawson

We've had quite a bit of rain lately, however I hardly ever see efflorescence like I found on these two homes. The last picture is from a slab that the builder added a layer of skim coat on to hide the honeycombing.

Could this be caused by a lack of a moisture barrier?

Donald

Yes. The second photo looks like rising damp, i.e., moisture wicking up from below.

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