| Term | Definition |
| Implied Authority |
An agent’s authority to do everything reasonably necessary to carry out the principal’s express orders.
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| Implied Contract |
An agreement that has not been put into words, but is implied buy the actions of the parties.
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| I-beam |
(Obsolete term) An American Standard section of hot-rolled steel.
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| Ice dam |
An obstruction along the eave of a roof caused by the refreezing of water emanating from melting snow on the roof surface above.
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| Igneous rock |
Rock formed by the solidification of magna.
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| Impact Insulation Class (IIC) |
An index of the extent to which a floor assembly transmits impact noise from a room above to the room below.
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| Impact noise |
Noise generated by footsteps or other impacts on a floor.
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| Impact wrench |
A device for tightening bolts and nuts by means of rapidly repeated torque impulses produced by electrical or pneumatic energy.
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| Ingot |
A large glock of cast metal.
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| Insulating glass |
Double or triple glazing.
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| Internal drainage |
Providing a curtain wall with hidden channels and weep holes to remove any water that may penetrate the exterior layers of the wall.
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| Interstitial ceiling |
A suspended ceiling with sufficient structural strength to support workers as they install and maintain mechanical and electrical installations above the ceiling.
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| Intrados |
The concave surface of an arch.
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| Intumescent coating |
A paint or mastic that expands to form a stable, insulating char when eposed to fire.
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| Inverted roof |
A membrane roof assembly in which the thermal insulation lies above the membrane.
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| Iron |
In pure form, a metallic element. In common usage, ferrous alloys other than steels, including cast iron and wrought iron.
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| Iron dog |
A heavy U-shaped staple used to tie the ends of heavy timbers together.
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| Ironworker |
A skilled laborer who erects steel building frames, or places reinforcing bars in concrete construction.
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| Isocyanurate foam |
A thermosetting plastic foam with thermal insulating properties.
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