Efflorescence on Masonry

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  #1  
Old 04-17-19, 08:31 AM
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Efflorescence on Masonry

We put in pavers about 10 years ago which covers 70% of the frontyard. In the last two years after heavy rain season, we see yellow powder on the pavers. It is also on all near by floors.

Would this be Efflorescence on Masonry? I thought it is supposed to be a white residue, not chalk yellow?

Also, would this be a health concern if breathed in, like getting cancer?

Thanks
 
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Old 04-17-19, 08:35 AM
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Are you sure the yellow powder isn't pollen?
I haven't heard of efflorescence causing cancer.
 
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Old 04-17-19, 09:52 AM
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Effervescent is like salt, as water passes through and evaporates the salt/minerals remain.

Yellow, got a picture?
 
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Old 04-18-19, 01:25 PM
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I have attached three pictures. It is a yellow powder.
 
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Old 04-19-19, 07:15 AM
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Looks like pollen to me also.
 
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