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Acoustical Ceilings - Glossary of Terms:

The ceiling in most cases is the most visible, eye catching part of the building. The choices made, and the design for installation mean too much. Differing level lines around the room, out of the ordinary angles, varying colors and lighting all add to the scheme of the property.

Bevel Edge: An acoustical tile is considered bevel edge material when the face of the tile turns up at the edge at approximately 45 degrees for 1/8" to 1/4" around the perimeter of the tile.

Border Cut: Cut made on both ceiling panel and grid at the perimeter of the installation.

Ceiling Suspension System: A system of metal members, designed to support a suspended ceiling, typically an acoustical ceiling. Also may be designed to accommodate lighting fixtures or air diffusers.

Cross Tee: Tee that is inserted into the main runner to form different module sizes.

Double Web: Indicates two layers of material in the construction of the vertical web of main runners and cross tees.

Fiberglass Panels: Processed from a molten state into fibrous glass strands, then formed into board stock. The manufacturing process requires a separate dimensionally stable facing material laminated to the fiberglass core to provide texture and pattern. Fiberglass, vinyl and polyester facings are typically used.

Fire Rated: Refers to the UL fire resistance rating of an assembly.

Flame Spread Rating: A single number measurement of the flame spread across the surface of a material. Defined by ASTM E 84 commonly known as the 25-foot tunnel test, the number is obtained by comparing with red oak flooring.

Gauge: Thickness of the steel used to make a grid member. May be expressed by a number designation (26 GA.) or in thousandths of an inch (0.013).

Grid: Structural system of main beams, cross tees, and associated hardware, which hangs from the deck above and supports lay-in, concealed or surface attached ceiling panels.

Hanger Wires: Wire employed to suspend the acoustical ceiling from the existing structure. The standard material is 2.05 mm (16 gauge) galvanized, soft annealed steel wire, conforming to ASTM A 641M or A 641. Heavier gauge wire is available for higher load carrying installations, or situations where hanger wire spacing exceeds 1200 mm (4 feet) on center. Seismic designs or exterior installations subject to wind uplift may require supplemental bracing or substantial hanger devices such as metal straps, rods, or structural angles.

Hold Down Clip: Mechanical fastener that snaps over the bulb of a grid system to hold ceiling panels in place.

Hook Tee: Cross tee with an end tab that hooks through the rout hole and rests on the vertical web of the main runner.

Intermediate-Duty Systems: These are used primarily for ordinary commercial structures where some ceiling loads, due to light fixtures and air diffusers, are anticipated.

Main Beam, Main Runner, Main Tee: Primary or main beams of the type of ceiling suspension system in which the structural members are mechanically locked together. Provide direct support for cross runners and may support lighting fixtures and air diffusers, as well as the acoustical tile. Supported by hanger wires attached directly to the existing structure or installed perpendicular to carrying channels and supported by specially designed sheet metal or wire clips attached to the carrying channels. Typically a 12' piece located 4' on center. Also referred to as H runners and Z bars

Mineral Wool: A man-made wool-like material of fine inorganic fibers made from slag, used as loose fill or formed into blanket, batt, block, board, or slab shapes for thermal and acoustical insulation.

Noise Reduction Coefficient (NRC): Average sound absorption coefficient measured at four frequencies: 250, 500, 1,000 and 2,000 Hz expressed to the nearest integral multiple of 0.05. Rates the ability of a ceiling or wall panel or other construction to absorb sound. NRC is the fraction of sound energy, averaged over all angles of direction and from low to high sound frequencies, that is absorbed and not reflected.

Override: Offset on the end of some cross tees that rests on top of the supporting members flange. Increases stability and moves cut edge of tee out of the visible plane of the ceiling.

Plenum:In suspended ceiling construction, the space between the suspended ceiling and the main structure above.

Scoring: Process of cutting grooves into the face of acoustical panels creating a different geometric visual with decorative and some acoustical benefit. Scoring often mimics the suspension grid, camouflaging it and making 2' x 2' and 2' x 4' panels look like 12" x 12" tile.

Suspension: A metal grid suspended from hanger rods or wires, consisting of main beams and cross tees, clips, splines and other hardware which supports lay-in acoustical panels or tiles. The completed ceiling forms a barrier to sound, heat, and fire. It also absorbs in-room sound and hides ductwork and wiring in the plenum.

Tegular: A functional edge detail. Tegular suspended ceiling panels have a rabbeted/reveal edge design that allows them to extend below the supporting grid, making the grid less conspicuous.

UBC 25-2: Uniform Building Code (seismic standard).

UL Label: An identification affixed to a building material or component, with the authorization of Underwriters Laboratories, Inc.

 Serving all areas Narberth, Lower Merion, Ardmore, Havertown, Bryn Mawr, Broomall, Newtown Square, Delaware County, South Philly and Philadelphia, PA. We want the out of the ordinary jobs. Items crafted for custom fitting. Fabricated items for anything. Quick & Honest Trades Services for over 25 years. Dropped, suspended, acoustical ceilings and ceiling tiles. Installations, replacements, reconditioning. Custom Suspended Ceilings - Call us about it 610-853-8311.
The ceiling in most cases is the most visible, eye catching part of the building. The choices made, and the design for installation mean too much. Differing level lines around the room, out of the ordinary angles, varying colors and lighting all add to the scheme of the property.
We make architectural parts.
We make architectural installations.
Wholesale and fabricated parts for office fit-outs, acoustical, suspended, commercial property ceilings and architectural access panels.