San Francisco : Architect and Engineer, Inc · leaf 604
1 by 4s the length of which is such thatthey come within two inches of thetreads. An added advantage in riser con-struction is given by sloping these pieces back, thus making an attractive lookingstep which provides a safety factor not present in most types. Cross planks,usually of one-inch… … Simple design which can be adapted to any number of concrete steps For steps of this kind it is best to use concrete mixed in the proportion ofone sack of Portland cement to 2 cubic feet of sand to 4 cubic feet of pebbles or 9g THE ARCHITECT AND ENGINEER • crushed stone. Forms may be removed as…
Architecture · Building
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