Estimating the Cost of Buildings, with Important Chapters on Estimating the Cost of Building Alterations, and on System in the Execution of Building Contracts; A Systematic Treatise on Factors of Cost and Superintendence, with Working Citations (Paperback)

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. 1910. Excerpt: ... CHAPTER XL BOARDING AND MEASURING ROOF SURFACES. As there is quite a difference in labor between square edged and matched boards, that may be used for wall and roofing covering and under floors, I think it is advisable to survey and keep quantities separate. Square edged boards are usually used for under floors, pitch roofs and wall covering. Obtaining the areas of floors and walls has been sufficiently explained under other headings, consequently I shall not go into the matter here. However, not having explained the method of obtaining pitch roof areas, I will endeavor to do so now. With most plans there is a drawing of the roof showing all ridges, hips and valleys. Where there is no such drawing the lines of the roof are sometimes indicated by dotted lines on the attic floor plan. Not infrequently the roof is shown in no other way than by the elevations. In case the roof is shown by either of the first two methods, you must refer to the elevations for part of the dimensions. In order to make matters as clear as possible, I will demonstrate by a few drawings. In Fig. 7 we have a roof plan. I am paying no attention to architecture in this plan; simply drawing a roof that has hips, valleys and dormers in order to illustrate all ordinary roof forms. Figs. 8, 9, 10 and n are the four elevations and are of the correspondingly numbered sides as Fig. 7. We will begin by obtaining the area of the section of roof marked A in Fig. 7. By scaling the ridge we g-et 32 ft. 6 in., and by scaling the roof at gutter line, paying no attention to the wing that projects 2 ft. on this side, we get 45 ft. Now, by referring to the elevation of the front, Fig. 10, we obtain the length of the rafter, which is 17 ft. 9 in. This section of the roof, as developed in Fig. 13, is cal...