The repair and restoration of elevated residential wood walkways would seem like an unusual concrete use. But, in the following example replacement with concrete has proven to be the perfect solution from the standpoint of economy and long-range freedom from maintenance.
Mayslake Village, a housing project for the elderly in Oak Brook, Illinois, had a serious problem with elevated wood walks serving the second floor apartments. These had been built with treated lumber. All the decks were 2 « by 6-inch laminated wood. The laminations were falling apart after the decks were less than two years old. Approximately 3000 linear feet of 7-foot-wide walks were involved. After extensive research, topping with concrete and then discarding the wood seemed to be the best solution.
Original wood decking was cut and dropped slightly to provide a temporary form on which to cast concrete. Over this was placed a layer of 1-inch-thick foamed polystyrene sheets. This layer served two purposes: first to provide a smooth surface over the existing irregular wood deck and second, to act as permanent insulation to reduce slipperiness on the concrete walks during freezing weather. The slabs were made of air-entrained 4000-psi concrete with one layer of 6 x 6 W4.0 x W4.0 welded wire fabric and three Number 4 bars in each panel. Joints were sawcut every 10 feet and the surface was sealed with two coats of a waterproofing compound.