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| Roof run
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The horizontal distance from the top plate of the wall to the midpoint of the roof. |
| Roof seamer
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A mechanical device used to crimp metal roof panels and make the seams watertight, or a machine used to weld membrane laps of PVC (Thermoplastic) roofing material. |
| Roof sheathing
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Flat boards which are nailed to the rafters on the top of a house, to which tar paper and then shingles are attached. |
| Roof slope
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The angle made by the roof surface plane with the horizontal plane and expressed as the amount of vertical rise for every twelve inch (12") horizontal run. For instance, a roof that rises four inches (4") for every twelve inch (12") horizontal run, is expressed as having a "four in twelve" slope; often written as "4. |
| Roof system
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Multiple roof components assembled to provide waterproofing (and sometimes insulating) capabilities for a structure. |
| Roof tile
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Roofing material, usually made of clay or cement. Used primarily in the south and west. |
| Roof truss
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A triangular structure used to support a roof. Multiple trusses are used to assemble the framework for a roof. |
| Roof ventilator
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A stationary or rotating vent used to ventilate attics or cathedral ceilings; usually made of galvanized steel, or polypropylene. |
| Roofer
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An individual who installs roof systems and materials. |
| Roofer's knife
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A blade with a hook shaped blade, used for cutting asphalt shingles. |
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