. Public health and preventive medicine. *T)amp-prooP furth . 82.—Hollow be lined with ood. Fig. 81.—Dry area. —The walls, for purposes ofstability, must be broadly broad bases are called thefootings (see Figs. 81 and 82),and rest upon the concretefoundations. In heavy or mainwalls they must extend onboth sides of the wall, andmust project on each side to adistance equal to one-half thethickness of the wall. Frombase to top the footing shouldbe two-thirds the thickness ofthe wall at its base, and fromside to side twice the thicknessof the wall. The dimensionsof the footing
. Public health and preventive medicine. *T)amp-prooP furth . 82.—Hollow be lined with ood. Fig. 81.—Dry area. —The walls, for purposes ofstability, must be broadly broad bases are called thefootings (see Figs. 81 and 82),and rest upon the concretefoundations. In heavy or mainwalls they must extend onboth sides of the wall, andmust project on each side to adistance equal to one-half thethickness of the wall. Frombase to top the footing shouldbe two-thirds the thickness ofthe wall at its base, and fromside to side twice the thicknessof the wall. The dimensionsof the footings in any particularcase depends on the natureof the foundations. In thecase <if brick footings, not morethan one-fourth the length ofeach subjacent course shouldbe free. It is most importantthat both footings and founda-tions be of the best material,as work is very apt to bescamped when hidden awayunderground. The same re-mark applies to the concealedpart of the walls, which, 310 BUILDING CONSTRUCTION Damp-proof courses.—As w
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