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| Lane
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(1) A narrow country road or city street. (2) A marked strip of road wide enough for a single line of cars or trucks. |
| Lane delineators
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Brightly colored cones or cylinders which are used as temporary lanes or detours on roadways. |
| Langelier's index
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A calculated number used to predict whether or not a water will precipitate, be in equilibrium with, or dissolve calcium carbonate. It is sometimes erroneously assumed that any water that tends to dissolve calcium carbonate is automatically corrosive. |
| Langley
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A unit or measure of solar radiation; 1 calorie per square centimeter or 3.69 BTU per square foot. |
| Lantern
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(1) Transparent case, which holds and protects a light from wind and weather. (2) Open or windowed structure on the roof of a building or the upper part of a tower, to admit light and air. (3) The room containing the lamp at the top of a lighthouse. (4) Light in a lobby, which signals the arrival of an elevator. |
| Lanyard
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(1) Cord worn around the neck from which to hang something, such as a knife, whistle, etc. (2) Rope that fastens to a safety belt on one side and a lifeline on the other. (3) Rope used to pull an object. |
| Lap
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(1) The part of the roofing/siding material that overlaps a section of adjacent material. (2) To lay or place one coat so its edge extends over and covers the edge of a previous coat, causing an increased film thickness. (3) Round metal rod with an abrasive coating that will smooth the inside diameter of a hole. (4) Using a fine abrasive compound to sand an item. |
| Lap cement
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Asphalt based cement, which makes a bond when it is used between the overlapped layers of roll roofing. |
| Lap joint
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Joint produced by lapping and joining two similar members. |
| Lap seam
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Where two material that overlap are sealed together. |
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