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Rabbet
Definition:

A groove cut into the surface along an edge so as to receive another piece.


Rain Screen
Definition:

A curtain wall system in which the outer façade shields, or “screens,” rain from infiltrating the wall cavity, but is not actually sealed. The cavity is pressure equalized with the outside air, avoiding pressure differences that would otherwise draw water into the cavity. Minor amounts of water that penetrate the rain screen are evacuated via weep systems designed into the system.


Raked Joint
Definition:

A mortar joint in which the mortar, while still soft, has been scraped back to a specified dimension with a square-edged tool. It is generally used to accentuate the joint due to the pronounced shadow line produced.


Random Slab
Definition:

A stone slab of length and width that are not prespecified, but rather determined by the size of the block from which it was cut.


Rebated Kerf
Definition:

A kerf that includes a second cut at 90° to the kerf axis which accommodates. position of the anchor so that it doesn’t occupy any of the joint region, allowing full movement capability of the joint dimension.


Recess
Definition:

Any feature cut into a stone that is set back or indented from the balance of the stone surface, either to accommodate another element, such as anchorage, or for aesthetic appeal.


Recrystallized Limestone
Definition:

A limestone in which a new pattern of crystallinity has pervasively replaced the crystal orientation in the original clastic particles, fossils, or fossil fragments, and interstitial cement.


Refinishing
Definition:

The process of insitu finishing of existing stonework to return it to its near original appearance.


Reglet
Definition:

A narrow groove cut in stone to receive flashing.


Reinforcement
Definition:

Any element, metal, fiberglass, stone, etc. that is embedded in or applied to the stone panel for the purpose of increasing strength.


Relief
Definition:

Carving or embossing raised above a background plane, as in a bas-relief.


Relieving Arch
Definition:

One built over a lintel, flat arch or smaller arch to divert loads, thus relieving the lower member from excessive loading.


Remnant
Definition:

A leftover portion of a slab that cannot be utilized in the primary project, but is salvaged for possible use in another project.


Reprise
Definition:

The line formed by the intersection of two like profiles upon meeting at an interior corner.


Resin
Definition:

Any of a number of clear or translucent substances, either from plant origin or synthetics, used in producing lacquers, adhesives, plastics, polyesters, epoxies, silicones, etc.


Resin Patching Sticks
Definition:

A stone patching material supplied as a solid substance and installed in a heated condition to facilitate flowing into surface imperfections to be filled.


Resin Polishing
Definition:

A reference to abrasive pads used for hand tool polishing, in which abrasives are embedded in a resin matrix.


Resined Slab
Definition:

Slabs that have been treated with a cosmetic improvement process prior to polishing, in which a resinous adhesive, usually epoxy, is applied to the face of the slab, filling various voids in the stone surface. The resin is cured at elevated temperature, after which it is polished, allowing the resin to remain in the voids. This produces a more cosmetically attractive surface without the interruptions of the natural defects.


Restoration
Definition:

Remedial action taken to return an existing installation of stone to its original or acceptable “near original” condition.


Return
Definition:

The right-angle turn of a stone surface, either a molding or flat, as in a window jamb condition.


Return Head
Definition:

See head.


Reveal
Definition:

The exposed portion of a stone between its outer face and a window or door set into an opening.


Ribbon
Definition:

Narrow bands of rock within the quarry deposit of contrasting color and/or texture due to varying mineralogical composition.


Rift
Definition:

Direction in which stone splits most readily. Term is most commonly used for granite or other stone without visible stratification or foliation.


Riprap
Definition:

Large, irregular shaped stones randomly placed on an embankment to prevent or minimize soil erosion.


Rock
Definition:

1. Geologically, any natural mass of earth material that has appreciable extent.
2. In engineering, solid natural material that requires mechanical or explosive techniques for removal.
3. In the quarry industries, the term stone is more common and means firm, coherent, relatively hard
earth material.


Rock Faced
Definition:

A rustic finish for veneer stone created with a split or chiseled face, and dressed along the stone’s perimeter to produce convex projection. See also pitch faced.


Rodding
Definition:

A reinforcement technique used principally in countertop fabrication where in metal or fiberglass rods are embedded into shallow kerfs in the underside of the stone slab at narrow regions of the countertop, such as the portion in from of a sink. See reinforcement.


Roman Arch
Definition:

A semicircular arch. If built of stone, all units are wedge shaped.


Rough Back
Definition:

The outermost slab produced when slabs are sawn from a block, having one side sawed and the other rough from the original quarry block face. Also known as “skin.”


Rough Sawn
Definition:

A surface finish resulting from the gang or wire sawing process.


Rubbed Finish
Definition:

A stone finish between smooth machine finish and honed, obtained by mechanical rubbing to a very smooth surface.


Rubble
Definition:

A term applied to dimension stone used chiefly for walls and foundations, consisting of stone units that may be highly irregular or partly trimmed or squared, generally with one or more split faces, and selected and specified with a size range.
Rubble stone may be installed randomly or coursed.


Rustication
Definition:

Any embellishment done to the joints in stonework, either chamfers or grooves, for the purpose of visually accentuating the joint by increasing the shadowline.