Natural Stone Definitions
A
Abate
In stone carving, to cut away material, leaving parts in relief.
Abrasive Finish
A non-reflective surface finish. An abrasive finish may be defined by the grit size of the abrasive.
Abrasive Hardness
A measure of the wearing performance of stone for floors, stair treads, and other areas subjected to abrasion by foot traffic
Absorption
The amount of water absorbed by a stone, expressed as a percentage by weight.
Abutment
A solid stone springer at the lowest point of an arch or vault.
Accelerator
In masonry, any ingredient added to mortar or concrete to speed the curing process.
Acid Wash Finish
Acids can be used to clean the surface of the stone or to change its appearance, depending on the type of acid and the length of its application. Acid wash is an alternative way to achieve an antiqued look. It can also produce similar results to waterjet finishing.
Most significantly, an acid wash can be applied retroactively, meaning you can change the look of already installed stone. Surface Roughness can vary from slick (< 1/64”) to somewhat rough (1/16-1/4”) depending on the process. Acid washes can be applied by hand or automated machine.
Adhered
Used in reference to stone veneer, secured and supported by adhesion of an approved bonding material over an approved backing.
Admixture
A material other than water, aggregates, lime or cement, added to concrete or mortar at the time of mixing. Admixtures are typically added to function as water repellents, coloring agents or to adjust the curing rate of