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Building Design and Construction Handbook - Merritt - Ventech!

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12.16 SECTION TWELVE<br />

FIGURE 12.9 Slate roof, (a) Slates in each course cover joints<br />

in those below, have a headlap of 3 in over the lowest course<br />

below, <strong>and</strong> have an exposure (portion not covered by next course<br />

above) equal to 1 ⁄2(L � 3), where L is the slate length, in. (b)<br />

Section at roof ridge illustrates the saddle-ridge method, in<br />

which regular slates extend to the ridge so that slates on opposite<br />

sides of the ridge butt flush. Another course of slate, called<br />

combing slate, is set on top, butting flush at the ridge.<br />

FIGURE 12.10 Roman tile application at hip <strong>and</strong> ridge of a roof.

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