Coal Tar Pitch Roofing Handbook - 1896 - Page 18
(To follow description of Roof Sheathing.)
Over the foregoing shall be laid a five (5) ply Coal Tar Pitch, Felt and Economite Tile Roof to be constructed as follows:
The Rosin Sized Sheathing Paper or Unsaturated Felt to be used shall weigh not less than five (5) pounds per one hundred square feet.
The Felt shall weigh not less than fourteen (14) pounds per one hundred square feet, single thickness.
The Pitch shall be the best quality of straight run coal tar pitch, distilled direct from American coal tar, and there shall be used not less than one hundred and twenty (120) pounds (gross weight) per one hundred square feet of completed roof.
The nailing shall be done with threepenny barbed wire roofing nails driven through tin discs.
The materials shall be used as follows:
First lay one thickness of Rosin Sized Sheathing Paper or Unsaturated Felt (A), lapping each sheet one inch over the preceding one, and nailing only so often as may be necessary to hold in place until covered with the Tarred Felt (B), and the nailing may be omitted entirely if practicable.
Over the Rosin Sized Sheathing or Unsaturated Felt lay two (2) full thicknesses of Tarred Felt (H), lapping each sheet seventeen (17) inches over the preceding one, and nailing along the exposed edges of the sheets only so often as may be necessary to hold the sheets in place until the remaining Felt can be applied.
Over the entire surface of the Felt thus laid, spread a uniform coating of Pitch (C), mopped on. Then lay three (3) full thicknesses of Felt (D), lapping each sheet twenty-two (22) inches over the preceding one, and nailing, as laid, every three (3) feet, not more than ten (10) inches from the upper edge.
When the Felt is thus laid and secured, mop back with Pitch (E) the full width of twenty-two (22) inches under each lap. Then finish with a course of Bituminous Concrete Tiles 10 x 10 1/2 inch laid in a thin coat of Coal Tar Pitch Coating as prepared for same by the Barrett Manufacturing Company.
Note. — When this roofing is laid over Concrete, apply the Felt and Pitch foundation as directed in “Barrett Specification over Concrete."
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