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| Under glass
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A term in older books referring to "growing under glass", essentially growing in a greenhouse. |
| Undercoat
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A primer or intermediate coating before the finish coating. |
| Underdrain
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A drainage system installed under a slab or street to divert and channel away excess water. |
| Underfloor raceway
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Hollow metal sections installed under a floor to contain electrical wiring. |
| Underfloor wiring system
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Wires, for example electrical, which are placed beneath the flooring of a structure. |
| Underground feeder cable
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Electrical cable with moisture resistant insulation, designed for underground use. |
| Underground home
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A house built into the ground or slope of a hill, or which has most or all exterior surfaces covered with earth. |
| Underground service
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Electrical power lines that are run underground in the street and to the building. Underground service has largely replaced the use of above-ground power lines in new housing developments. |
| Underimprovement
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Property improvements that are below the usual standard expectations. |
| Underlayment
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A material installed over the roof deck and under siding panels prior to the application of the primary covering. Usually consists of fifteen (15#) or thirty (30#) pound organic felt but can also be self-adhering such as an ice and water protection membrane. |
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