37. Window and Door Sill Flashings. (-1.) Sill flashings for window frames in frame construction shall be set before the frame is placed. They shall extend to the back of the window sill and shall be nailed after the frame is set, and shall also extend 4 inches outside beyond the sill.

   (-2.) Wood sills set in stone or concrete shall have a strip of 20-ounce or heavier hard (cornice temper) copper at the joint. Just before setting the wood sill this reglet shall be filled with waterproofing-compound and the strip shall be embedded in it.

38. Window and Door Sill Flashings. (Carpenter's Specification.) The sills of wood frames set in stone or concrete shall have a slot 1 inch deep to receive a copper flashing strip.

39. Window and Door Sill Flashings. (Mason's Specification.) Stone or concrete sills under wood window or door frames shall have a l-inch by 1-inch reglet cut or cast in them to receive a copper flashing strip.

40. Water-table Flashings. Water-table flashings shall extend up the sheathing at least 2 inches above the butt of the second course of siding, and in no case less than 4 inches.

   (-A.) It shall be formed over the edge of the water-table to make a drip and shall be secured at the upper edge by nails 4 inches apart.

   (-B.) If the edge-strip method of fastening is used the upper edge shall be nailed about every 8 inches.

41. Hips and Ridge Flashings. (-1.) Install hip and ridge flashings over battens set by other contractors. They shall be secured on either side of the roll by round-head brass wood-screws about 12 inches apart, set through washers. Holes in the roof covering shall be drilled. The heads of the screws and washers shall be soldered.

   (-2.) Hip and ridge rolls of design shown shall be installed over battens, etc., set by other contractors. The apron shall be held down by 3/16 x 1-inch brass bands 30 inches apart, secured to the batten by brass wood screws through countersunk holes.

42. Column-Cap Flashings. The upper surfaces of all exposed column caps shall be flashed. The flashing shall be formed to fit the cap and shall be turned down ½ inch over the edge of the cap and nailed every 1½ inches. A separate piece shall be fitted over the dowel and soldered to the main flashing.

43. Column-Base Flashings. Bases of wood columns shall be flashed by a cap made to fit the dowel used to secure the column. The cap shall have a flange extending out on the roof on all sides the necessary distance to provide for water-proofing, as specified elsewhere for different kinds of roofing materials.

44. Ventilator Flashings. Where metal ventilators are used on a roof they shall be connected to the flashing by a soldered lap seam. The flashing sheet shall extend out over the roofing on all sides at least 6 inches.

   (-1.) On shingle or slate roofs the flashing shall be secured by round-head brass wood-screws set through holes drilled in the roof covering. The screws shall be set with slotted brass washers and shall be soldered to the flashing. The sides of the flashing shall be formed with a mallet over the roofing.

45. Guy-Anchor Flashings. When bolts or similar devices penetrate sloping roof coverings, they shall be flashed as follows:

   Before the courses above the bolt are laid, a piece of copper about 8 inches wide shall be placed over the lower roof covering and the sheathing with the bolt projecting through a hole in the center. The sheet shall be of sufficient length to lap the first course below the bolts 4 inches and up and under the courses above as far as possible without puncture by nails. The joint between the bolt and the sheet shall be closed by

   (-A.) Soldering to the sheet a flanged copper thimble placed around the bolt and caulked with waterproofing-compound.

   (-B.) Soldering the sheet to the bolt.

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