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general way in the “Barrett Specification Roof over Concrete", but it takes more skill and dexterity to do this work on a perpendicular wall than on a flat surface and the utmost care and knowledge is necessary to protect exposed edges and make the proper connections where the work must necessarily be suspended to be taken up later.

   The cost of this class of work per square foot can scarcely be stated in a general or approximate way, owing to the wide range of conditions under which it is required. The waterproofing of concrete floors or vault arches above grade is fairly simple and may be done strictly along the lines of the Barrett Roof Specification over Concrete.

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