What factors affect masonry units?

The higher absorption limits allowed by the ASTM C90 standard for lower density units do not necessarily correlate with lower resistance to water penetration. One of the reasons is that resistance to water penetration is known to be greatly affected by labor and depends on the details for water management. It is generally recognized that these two factors have a greater influence on the wall's resistance to water penetration than other factors, such as the density of the units.

Jim Anselmo
Jim Anselmo

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