Plywood End Roman Arch Forms

Scribe a circle on a sheet of 5/8-inch (1.5 cm) or %-inch (1.875 cm) thick plywood.

This provides both faces of the arch. Cut enough two-by-four ribs to be evenly spaced at most nine inches (22.5 cm) on center over the entire arch form. Top and bottom ribs should be placed narrow edge out. The rest should be installed the opposite way. The bottom can be solid plywood or boards.

Skin the top of the arch with 1/8-inch (0.3 cm) Masonite or any sturdy yet bendable substitute. Begin screwing from the top of the form and work toward the bottom ends one rib at a time. Sink screws deep enough to prevent them from catching onto the

' or masonite sheathing

' or masonite sheathing

countersink screw-heads to avoid catching on chicken wire plywood fac

: bracing countersink screw-heads to avoid catching on chicken wire plywood fac

: bracing

A-27

A-27

flexible plywood or masonite sheathing

1" x 8" cross bracing

1" x 8" cross bracing flexible plywood or masonite sheathing

chicken wire cradles when removing the form from the wall. Cut handholds into the two faces of the arch form for ease of removal and carrying (Fig. A.26).

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