Fig. 32 shows a simple form of roof gutter. It consists of a board nailed to the roof and braced by brackets a, a. The board is laid on an incline to form the proper grade, and the lining, which is usually bright tin or terne plate, is continued up under the shingles, and nailed down. The front edge is doubled over a strip of metal which has previously been closely nailed to the woodwork. This is called a blind edge.

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Fig. 32.

The necessary incline of this gutter spoils its appearance; to form a roof gutter which will appear parallel with the roof, it is necessary to build it in a manner similar to that shown in Fig. 33. A tapering gutter strip a, usually 2 inches thick, is laid to run the whole length of the gutter, and grades the bottom in a proper manner. These gutters really form snow boards, and during winter often become so clogged with snow that the water from melting snow cannot run off the roof freely, but is forced to pass through between the shingles or slates and thus cause a temporary leakage. For this reason, they are not to be recommended.

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Fig. 33.