THE three foregoing Specifications have been standards for many years. Slag and Gravel roofs are used on all kinds of buildings; Vitrified Tiles and brick are used mainly on massive fire-proof structures of the first class.

As Vitrified Tile or brick roofs are costly and heavy, an urgent demand for a smooth surfaced, light weight roof of moderate cost, suitable for all kinds of flat roofed buildings has been most satisfactorily met by the introduction a few years ago of "Economite Tile Roofing” the proper Specification for which follows on page 18 and 19.


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