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| Flat seam
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A seam at the junction of sheet metal roof components that has been bent at the plane of the roof. |
| Flat skylight
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Glass skylight that is flat rather than concave. |
| Flat slab floor
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Concrete slabs, which are isolated from the foundation with rigid insulation and are reinforced in two directions or more. |
| Flat-black paint
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Nonglossy paint with a relatively high absorptance. |
| Flat-plate solar photovoltaic module
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An arrangement of photovoltaic cells or material mounted on a rigid flat surface with the cells exposed freely to incoming sunlight. |
| Flat-plate solar thermal/heating collectors
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Large, flat boxes with glass covers and dark-colored metal plates inside that absorb and transfer solar energy to a heat transfer fluid. |
| Flatting agent
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Added paint pigment, which reduces gloss on a finished surface. |
| Flaw
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Deficiency or defect. |
| Fleche
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A slender spire, most commonly on the roof ridge of gothic style buildings. |
| Flecks
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The wide irregular conspicuous figure in Quartersawn oak flooring. |
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