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| Lagging
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Insulation for thermal piping, which minimizes heat loss through a pipe wall. |
| Lagging indicators
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Six lagging indicators issued by the government consisting of unemployment rate, corporate expenditures, labor cost per unit, loans outstanding, bank interest rates and book value of trade inventories, trail behind aggregate economic activity. |
| Lagoon
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In wastewater treatment or livestock facilities, a shallow pond used to store wastewater where sunlight and biological activity decompose the waste. |
| Laitance
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An accumulation of fine, powdery aggregate particles on fresh cement caused by the upward movement of water; indicates that too much water was used in the mix resulting in poor surface adhesion for a waterproofing layer. |
| Lally column
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Circular, concrete filled pipe, which is used as a support for beams and girders. |
| Lamella
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(1) A thin plate-like part, layer or structure. (2) Wood that is laid out and joined in crosspieces to create a diamond pattern in this roof framing method. |
| Laminar flow
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Streamline flow in a fluid near a solid boundary. |
| Laminate
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Plastic-like material used as countertops, which is known by several brand names, including Formica. |
| Laminate flooring
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Relatively new to North America, laminates have a dense fiberboard core with a paper pattern layer sealed under high pressure both top and bottom with a plastic-like substance. Sold as planks and panels in wood, stone, tile and other looks. |
| Laminate trimmer
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Smaller than most standard model routers, the laminate trimmer is the router of choice when trimming laminates and veneers. Its smaller size gives the user better control over the unit when trimming in precarious spots. |
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