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| Shark fin
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A felt lap, either side or end, on a built-up roof which is curled up and resembles a sharp fin. |
| Sharpen
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To make sharp by honing. |
| Sharpening stone
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| Shear
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(1) Any of several large tools or machines used to cut metal. (2) To remove by cutting or clipping. (3) To clip at right angles. (4) Resistance to sideway movement. |
| Shear force
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Force which acts on gravity, perpendicular to a plane. A heavy hanging item, held by nails or screws, is subject to the force of gravity that acts on the subject with "shear force". |
| Shear plate
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A plate which is fastened or welded to a structural piece so that it can resist and prevent a shear force from moving pieces in relation to each other by the force of gravity. |
| Shear wall
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Wall which is designed to add stiffness to a stud wall so that it can resist sideways or horizontal loads by mounting plywood sheathing from the bottom plate to the top plate and nailing it in place as shown by the shear schedule in the plans. |
| Shearing stress
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The force of gravity that causes two contacting parts or layers to slide upon each other, moving apart in opposite directions parallel to the plane of their contact. |
| Sheathing
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(1) Sheets of material (plywood) which are applied across floors, rafters or studs. (2) Outer covering of electrical cable. |
| Sheathing paper
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Moisture resistant paper, which is applied under a final covering of roofs or walls, to serve as a barrier against the weather. |
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