A treatise on architecture and building construction (1899)
International Correspondence Schools · Scranton, The Colliery engineer co. · leaf 564
19 CALCULATING QUANTITIES. 83 draw the line cb, which will be the true length of the valleyrafter a b. 35. As an example of roof mensuration, the number ofsquare feet of surface on the roof shown in Fig. 8 will becalculated. The area of the triangular portion acb \^ equal to the >n -i3- X … Fig. 8. slope length of ^<:—found by laying off cU equal to theheight of the ridge above the eaves and drawing c ^—multi-plied by the length of the eaves line a b and divided by 2.Multiplying the dimensions 13.75 feet and 23 feet, respect-ively, and dividing by 2, the area is found to be 158.1…
Architecture · Building
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