Glossary of Terms - N - NATIONAL ASSOCIATION OF MARBLE PRODUCERS: The National trade Association of the American Marble Industry whose membership is composed of marble producers (quarries) in the United States, its territories and Canada. NATURAL BED: The setting of the stone on the same plane as it was formed in the ground.This generally applies to all stratified materials. NATURAL CEMENT: Lime with high clay content. NATURAL CLEFT: This generally pertains to stones which are formed in layers in the ground.When such stones are elevated or separated along a natural seam, the remaining surface is referred to as a natural cleft surface. NATURAL STONE: Although technical a redundancy, as a stone its occurrence by definition, the term is used to distinguish true stone from imitation materials. NEAT CEMENT: A pure cement uncut by a sand admixture. NET CROSS-SECTIONAL AREA: See cross-sectional area. NICKED BIT FINISH: Obtained by planing the stone with a planer tool in which irregular nicks have been made in the cutting edge. NOMINAL DIMENSION: A dimension greater than a specified masonry dimension by the thickness of a mortar joint. NONCOMBUSTIBLE: Any material that will neither ignite nor actively support combustion in air at a temperature of 1,200 degrees Fahrenheit when exposed to fire. NONCORRODING: Resistant to harmful oxidation or other corrosive actions because of its composition (i.e. stainless steel, bronze, copper). NON-FERROUS: Not containing iron material. NON-STAINING MORTAR: Mortar composed of materials which individually or collectively do not contain material that will stain and usually have a very low alkali content. NOSING: The rounded front edge of a stair tread. NOTCHED TROWEL: Trowel with a serrated or notched edge used for spreading mortar or adhesive in ridges of a specific thickness. Return to Glossary Index Page Home| About Us| Design| Products| Project| Contact Us
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