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PEL
Definition:

Permissible Exposure Limit: PELs are established and enforced by OSHA to protect workers against the health effects of overexposure to hazardous substances.


PPE
Definition:

The abbreviation for Personal Protective Equipment, such as protective clothing, safety toe shoes, helmets, goggles, etc., designed to protect the wearer’s body from injury from exposures in the work environment.


Palletize
Definition:

To stack and secure stone units to a pallet for ease, safety, and efficiency in handling and transport.


Panel
Definition:

A term used to describe either a single unit of fabricated stone veneer, or a preassembled panel including multiple stone units affixed to a structural panel framework.


Parapet
Definition:

A low wall along the edge of a terrace, roof, or balcony, which is usually simply the extension of the exterior wall below it.


Parge
Definition:

To apply a thin coat of mortar, thin-set, neat cement, or other bonding agent to the back of stone units, or to the face of the backup material, normally for the purpose of reducing the voids, increasing bond strength, or waterproofing. See also back parging and neat cement.


Patina
Definition:

The change in color or texture of the surface of natural stone due to age or exposure to various elements.


Paver
Definition:

A single unit of fabricated stone for use as an exterior paving material.


Paving
Definition:

Stone used as an exterior wearing surface, as in patios, walkways, driveways, etc.


Pedestal
Definition:

In classical architecture, the support for a column or statue, consisting of a base, dado, and cap.


Pediment
Definition:

The gable end of a roof in classical architecture. Located above a horizontal cornice member, it comprises the raking cornices and the tympanum. It is typically triangular, but can also be curved when applied as a decorative element over windows.


Percussion Drilling
Definition:

Any method of drilling that includes a combination of hammering blows along the longitudinal axis of the bit with rotation of the bit. Also called “hammer” drilling.


Perforated Wall
Definition:

One which contains a considerable number of relatively small openings, often called pierced wall or screen wall.


Pergola
Definition:

Garden structure formed by two rows of posts or pillars with joists and open framing above, often covered by climbing plants and shading a walkway.


Phenocryst
Definition:

One of the relatively large and ordinarily conspicuous crystals of the earliest generation in a porphyritic igneous rock.


Pilaster
Definition:

A shallow, engaged pier or column projecting from a wall, only decorative in function.


Pillowed
Definition:

A tile finish that features softly rounded edges, thus giving the tile a pillowed look.


Pit Quarry
Definition:

Below ground-level quarry.


Pitch 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 rock faced.


Pitched Stone
Definition:

See pitch faced.


Plinth
Definition:

1. The base block at the junction of the stone base and trim around a door or other opening.
2. The bottom stone block of a column or pedestal.


Plucked Finish
Definition:

A stone surface produced by setting a planer blade so deep that it removes stone by spalling rather than by shaving.


Plutonic
Definition:

Applies to igneous rocks formed beneath the surface of the earth, typically with large crystals owing to the slowness of cooling.


Pointing
Definition:

The final filling and finishing of mortar joints that have been raked.


Polished Finish
Definition:

A glossy, highly reflective surface finish that brings out the full color and character of the stone.


Polishing
Definition:

A process utilizing abrasives in combination with specific polishing powders and/or chemicals to produce a glossy, highly reflective surface finish on the stone.


Polishing Compounds
Definition:

Any of the powders or chemicals used in addition to the abrasive machine heads that are used to achieve a polished finish.


Polishing Cream
Definition:

A polishing compound that is supplied in a cream or paste consistency.


Polishing Pads
Definition:

Small diameter flexible disks with embedded abrasives used with handheld tools or small portable machines for polishing of stone. These pads may be used in combination with compounds, and may be used either wet or dry.


Porphyry
Definition:

An igneous rock characterized by distinct and contrasting sizes of coarse and fine-grained crystals. Used as a decorative building and/or paving stone.


Portico
Definition:

A porch formed by a roof supported with columns, similar to a temple front.


Poultice
Definition:

Any absorbent material (powder, cloth, etc) used in a saturated condition with water or solvent based fluids and applied to a stone surface for the purpose of removing embedded stains.


Preassembled Units
Definition:

A composite unit consisting of a structural backing, usually steel or concrete, multiple panels of stone, and necessary anchorage and connection hardware that is built off-site and transported to the construction site for erection.


Precast
Definition:

In stone facades, refers to a bi-material panel consisting of multiple stone face units and a concrete backer panel. The panel is cast off-site, then transported to the construction site for erection.


Pressure Relieving Joint
Definition:

See expansion joint.


Primer
Definition:

1. A unit or package of ignition devises used to initiate other explosives or blasting agents in the quarry.
2. A liquid coat applied to increase bond strength of a joint sealant.


Privacy Partition
Definition:

A thin stone panel between urinals. See urinal screen.


Producer
Definition:

Company or person that quarries and supplies dimension stone to the commercial market.


Profile Wheel
Definition:

Any grinding wheel that has convex or concave shapes and can be adapted to a router, hand held grinder, or CNC machine for the purpose of producing a desired shape to a stone edge.


Projections
Definition:

Any stone that is installed in a position outward of the balance of the wall for aesthetic or water control purposes.


Prospecting
Definition:

The practice of locating mineral deposits of commercial value.


Pumice
Definition:

Exceptionally cellular, glassy lava resembling a solid froth.