Copper Flashings - A Manual - 1925 - Page 41
Where rods, etc., necessary to support terra-cotta balustrades or other architectural members, penetrate the flashings, the joint shall be made water-tight as follows: The rods being in place, the flashing pieces shall be marked, punctured and set in position by sliding down over the rods; or, if this method is impracticable, the sheets may be slit to allow them to be slid into place. The slit shall be made tight by soldering a strip over it. Cups or thimbles, conforming roughly to shape of the rod or bar shall be then placed over the rods and soldered to the sheet. They shall be at least 1 inch larger all around than the rods. The cups shall then be filled with mortar or an approved waterproofing-compound.
78. Terra Cotta. (Manufacturers’ Specification.) (-A.) Edges of all top pieces of projections to be flashed shall have formed on the vertical face holes about 9 inches apart, ⅜ inch in diameter, and at least ¾ inch deep, for fastening the flashings.
(-B.) All edges to receive flashings shall have a rounded nosing around which the flashing sheet may be hooked and held firmly.
Where indicated on the drawings or directed by the architect, holes shall be formed in the terra cotta for securing flashing cleats. They shall be spaced about 12 inches.
79. Flashings Between Old and New Work. Where new work is to be flashed against old work, such as at the junction between an old and new building, the flashing shall be such as to allow for settlement.
(-1.) Where the new wall is higher, the top of the old wall shall be covered with a flashing cap, extending completely over it and placed before the new wall is brought up. The old work shall then be flashed and counter-flashed to the new, the base flashing being turned down over the old wall and locked to the cap, and the counter-flashing being built in with the new work as specified elsewhere.
(-2.) Where the new wall is lower than an old wall, a flashing cap shall be placed over the new wall and turned down on both sides. The joint shall then be flashed and counter-flashed, the base flashing extending down over the new wall and locking to the cap. The counter-flashing shall be set in a reglet cut for it in the old wall and caulked with lead wool.
(-3.) When the walls are level, the flashing shall consist of a cap continuous over both walls, properly sloped to shed water, and secured by brass wood-screws to the underside of a two-piece wood blocking secured on top of the walls by others. The flashing shall be in two pieces joined by a standing seam, or a loose-locked seam placed on one vertical side of the blocking so as to prevent leakage and to allow for settlement.
80. Skylights. Where shown on the drawings build skylights of size indicated and of approved designed and manufacture, with curbs at least 10 inches above the roof. All sheet metal shall be 16-ounce hard (cornice temper) copper reinforced for strength and stiffness with steel sections. Copper and steel shall be insulated by strips of 3-pound lead or by an asbestos covering on the steel. All sash bars and bearings for glass shall have condensation gutters leading to the outside of the skylight. All skylights shall be made water- and weather-tight with joints interlocked, riveted and soldered and shall conform to the requirements of the National Board of Fire Underwriters. Duplicate sets of detail drawings shall be submitted for approval.
81. Louvres. Where shown on the drawings louvres shall be formed of
(-B.) wood covered with copper.
Duplicate sets of detail drawings shall be submitted for approval.
82. Cornices. Where shown on the drawings cornices shall be erected of 20-ounce hard (cornice temper) copper. They shall be made in strict accordance with the profiles shown on drawings with moldings true, sharp and straight. All flat surfaces over 5 inches wide shall be crimped, all mitres
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