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Natural Hydraulic Lime
Natural Hydraulic Lime is supplied dry in bags for mixing on site with a sharp, washed, well graded sand.
NATURAL HYDRAULIC LIME NHL 5
This grade of lime imparts plasticity, elasticity, strength and rapid resistance to frost. Suitable for mortars, both bedding and pointing and base coats of rendering.
Supplied in 25kg bags.
NATURAL HYDRAULIC LIME NHL 3.5
The most commonly used lime, NHL 3.5 has a whiteness which allows the colour of the sand to be appreciated making it highly suitable for mortars. Also used for the intermediate and top coat of render and plaster.
Supplied in 25kg bags.
NATURAL HYDRAULIC LIME NHL 2
Particularly suitable for interior and exterior use on weak structures. Used in conservation work where the existing masonry has deteriorated, was originally built with a weak mortar or where the structure was built using soft materials.
Supplied in 25kg bags.
General Mix Ratios
Plasters contain more lime than Mortars, but mix ratios are defined by the particle size for binding, the need to adhere to substrates,or to bring out the colour of the sand .
Depending on the aggregate particle size, 'the more fines,the more lime' needed.
Sand to lime ratios (sand : lime) are generally, Mortars 3:1, Renders 2.5:1, Plasters 2:1
Plasters may sometimes be richer in lime for adhesion, mortars leaner in lime for colour