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nailable concreteconcrete, usually made with a suitable lightweight aggregate, with or without the addition of sawdust, into which nails can be driven.
natural bedthe setting of the stone on the same plane as it was formed in the ground. this generally applies to all stratified materials.
natural clay tilea tile made by either the dust-pressed method or the plastic method, from clays that produce a dense body having a distinctive, slightly textured appearance. 
natural cleftthis generally pertains to stones which are formed in layers in the ground. when such stones are cleaved or separated along a natural seam the remaining surface is referred to as a natural cleft surface.
neat cementhydraulic cement in the unhydrated state. neat cement grout. a fluid mixture of hydraulic cement and water, with or without admixture; also the hardened equivalent of such mixture.
neat cement pastea mixture of hydraulic cement and water, both before and after setting and hardening. neoprene. a type of synthetic rubber with outstanding oil resistance. can be used for quick-setting, high strength adhesives.
nepheline syenitea mineral aggregate consisting chiefly of albite, microcline, and nephelite, each in significant amount. 
nichea recess in an interior or exterior wall usually for a statue or an urn, and typically semicircular in design.
nicked bit finishobtained by planing the stone with a planer tool in which irregular nicks have been made in the cutting edge.
nominal sizesthis is the approximate facial size or thickness of tile, expressed in inches or fractions of an inch, for general reference.
non-slip tiletile having greater non-slip characteristics clue to an abrasive admixture, abrasive particles in the surface, grooves or patterns in the surface or because of natural non-skid surface characteristics.
non-staining mortarmortar composed of materials which individually or collectively do not contain material that will stain, usually having a very low alkali content.
non-vitreousthat degree of vitrification evidenced by relatively high water absorption.  note: the term nonvitrcous generally signifies more than 10.0 her cent water absorption, except for floor and wall tile which are considered nonvitreous when water absorption exceeds seven per cent.
notched trowelsnotched trowels are available in the serrated and square-tooth design. the teeth are made in various sizes. the correct tooth size and depth must be used to apply the thickness of bonding mortar specified. these trowels are used to apply all of the various kinds of bonding materials for ceramic tile. when the teeth become worn, the trowel has to he resharpened or replaced.