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half and halfsee spacing mix.
  
hard screeda mortar screed that has become firm.
  
hard tilea term used in the tile trade to designate types of tile, such as ceramic, glass mosaic, marble tile, etc., over which the tile trade has jurisdiction. hard tile as compared to resilient tile.
  
hawkhawks range in size from 10″ to 14″ square, but tilesetters generally prefer the 11″ square. most hawks are made of aluminum with a wooden handle at the center. a rubber pad fits over the handle and covers that portion of the metal hawk that would come in contact with the hand. the hawk should not be held with a hand that is wet or covered with lime or mortar.
  
headthe end of a stone which has been tooled to match the face of the stone. heads are used at outside corners, windows, door jambs, or any place where the veneering will be visible from the side.
  
healing powerthe ability of a glaze to heal surface blemishes during firing. 
  
hearththat part of the floor of a fireplace of stone on which the fire is laid.
  
hearth stoneoriginally the single large stone or stones used for the hearth, now most commonly used to describe the stone in front of the fire chamber and many times extending on either or both sides of the front of the fire chamber.
  
heavy duty tiletile suitable for areas where heavy pedestrian traffic is prevalent. tile can be specified to meet higher test values as determined by job requirements but a minimum heavy duty tile test requirement is necessary.
  
hoda portable trough for carrying mortar, bricks, etc., fixed crosswise on top of a pole and carried on the shoulder.
  
holessinkages in the top beds of stone to engage lewis pins for hoisting.
  
hollow castingsee casting, drain.
  
honed finishhoned is a super fine smooth finish, though not as fine as a polished finish.
  
hopped-up mudmortar mixed with an accelerator. horizontal broken joints. a style of laying tile with each course offset one-half its length.
  
hot cementnewly manufactured cement which has not had an opportunity to cool after burning and grinding of the component materials.
  
hot mud or hot stuffmortar mixed with an accelerator. hot pressing.- see pressing, hot.
  
huethe attribute by which a perceived color is distinguished as red, yellow, green, blue, purple or a combination of these. white, gray and black colors possess no hue. lightness – the attribute by which a perceived color is judged to be equivalent to a member of the continuous series of grays ranging from black to white. saturation – the attribute by which a perceived color is judged to depart from gray of equal lightness toward a pure hue.
  
hydratea mineral formed by the combination of water and some other elements or compounds.
  
hydrated limecalcium hydroxide, a dry powder obtained by treating quicklime with water.
  
hydrothermalof or relating to hot magnetic emanations that are rich in water.
  
hydrouscontaining chemically combined water.