Hydraulic in “Natural Hydraulic Lime (NHL)” means that it sets up underwater instead of carbonating like non-hydraulic lime putty mortars
In the world of NHL’s 3 different strengths are common:
Installation and curing are easy to learn by masons due to their similarity to modern Portland products. Mix NHL with easy to find mason’s sand.
MIX RATIO: ROUNDTOWER NHL’S FOR POINTING AND BEDDING ARE MIXED AT A RATIO OF 2 1/2 PARTS MASON’S SAND TO 1 PART NHL (by volume, not weight)
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is typically used for interior/exterior plastering, stucco and older soft bricks. Currently available in 55lbs (25kg) bags.
is typically used with old harder bricks and stone. Currently available in 55lbs (25kg) bags.
is used extensively for limecrete flooring and is appropriate in areas of extreme exposure. NHL 5.0 is the hardest of the NHL’s, we recommend caution where it is used.