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Topic: Water absorption rates of paving< Next Oldest | Next Newest >


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Joined: Feb. 2014
Posted: 24 May 2019,22:03 QUOTE

Doing some research and read paving with a water absorption rate above 1.7% will discolour easily.

Would paving with water absorption rate of 1.7% increase or decrease the chance of mortar pointing stains occuring?

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Tony McC

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Posted: 30 May 2019,09:50 QUOTE

Increase, usually, but don't regard water absorption values as being a definitive and unfailing guide to staining potential. Some stones/pavings with WA values >2% will, it is true, readily absorb stain-causing material, but some of them will also rapidly surrender such material when washed down with soap and water.

The problems really come about when you have a substrate that is absorbent and with a high volume of micro-interstices, combined with hydrophobic contaminants: that's the best recipe for a hard-to-shift stain!

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