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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 a natural cleft surface. Non-manmade finish of stone with foliation, such as slate, certain sandstones and schistose rocks. The finish is obtained by de-lamination of the layers of the stone along its foliation

NATURAL STONE
Although technically a redundancy, as stone is naturally occuring by definition, the term is used to distinguish true stone from imitation materials.

NEAT CEMENT
A pure cement uncut by a sand admixture. Obtained by planning the stone with a planer tool in which irregular nicks have been made in the cutting edgeObtained by planning the stone with a planer tool in which irregular nicks have been made in the cutting edge

NEGATIVE LIP
When a factory-finished tile (or whatever different cut of stone) is installed lower in relation of at least three other surrounding tiles

NOMINAL DIMENSION
A dimension greater than a specified masonry dimension by the thickness of a mortar joint

NON-COMBUSTABLE
Any material that will neither ignite nor actively support combustion in air at a temperature of 1.200’F when exposed to fire

NON-CORRODING
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
A mortar with a low free-alkali content to avoid efflorescent or staining by adjacent stones migration of soluble materials

NOSING
The rounded front edges of a stair tread