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Ballast

A transformer that steps up the voltage in a florescent lamp. An electrical device to provide the starting voltage and operating current for fluorescent, mercury, and other electric discharge lamps.

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Backfill

The replacement of excavated earth into a trench around or against a basement /crawl space foundation wall. Earth filled in around a foundation wall to replace earth removed for construction of the foundation.

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Back Charge

Billings for work performed or costs incurred by one party that, in accordance with the agreement, should have been performed or incurred by the party to whom billed. Owners bill back charges to general contractors, and general contractors’ bill back charges to subcontractors. Examples of back charges include charges for cleanup work or to repair something damaged by another subcontractor, such as a tub chip or broken window.

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Backout

Work the framing contractor does after the mechanical subcontractors (Heating-Plumbing-Electrical) finish their phase of work at the Rough (before insulation) stage to get the home ready for a municipal frame inspection. Generally, the framing contractor repairs anything disturbed by others and completes all framing necessary to pass a Rough Frame Inspection.

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Backing

Frame lumber installed between the wall studs to give additional support for drywall or an interior trim related item, such as handrail brackets, cabinets, and towel bars. In this way, items are screwed and mounted into solid wood rather than weak drywall that may allow the item to break loose from the wall. Carpet backingholds the pile fabric in place.

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Bar Joist

Open-web, flat truss structural member used to support floor or roof structure. Web section is made from bar or rod stock, and chords are usually fabricated from "T" or angle sections.

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