This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ...convenience or economy. 3. The tie beam should be supported at such small intervals that it need not be too large for economy or convenience. It has been found by experience that these objects can be attained by limiting the distance between the points of support on the principal rafter to 8 feet. In determining the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ...convenience or economy. 3. The tie beam should be supported at such small intervals that it need not be too large for economy or convenience. It has been found by experience that these objects can be attained by limiting the distance between the points of support on the principal rafter to 8 feet. In determining the form of truss for any given span, it is therefore necessary first to decide the pitch, then roughly to draw the principal rafters in position, ascertain their length, divide them into portions 8 feet long, and place a strut under each point of division. By this it will be seen that a king-post truss is adapted for roofs with principal rafters 16 feet long, i.e. those having a span of 30 feet A queenpost truss would be adapted to a roof with principal rafters 24 feet long, that is of about 45 feet span. For greater spans with longer principal rafters, roofs such as that in Fig. 160. CHAPTER VI. ROOF COVERINGS. Subjects required by Syllabus, and (in brackets) the pages at which they are treated upon. Roof coverings of tiles p. 102 and zinc p. 107. Slate ridges and hips p. 112. General Remarks.--Roofs are covered with different materials according to the locality, the climate, and the nature and importance of the building. As a rule, the smaller the pieces in which the covering is put on, the heavier will it be, and the more difficult to keep watertight, as it will contain a greater number of openings or of joints. Substances which conduct heat very slowly, such as slate, make better coverings than the metals; the former preserve an equable temperature, while the latter conduct the heat in summer, and the cold in winter, to the interior of the building. Pitch of Roofs.--The pitch, or inclination of the sides of a roof, is determined chiefly by the ...
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