Secure the Shutters on a Concrete Block Structure
To install a hurricane shutter on a home built with concrete blocks -- or stucco over concrete blocks -- you once more begin with the same 5/8" CDX plywood shutter cut 7" wider and 7" longer than the window you want to cover. Concrete block construction, however, requires different fastening hardware and a different technique than does a frame home.
With the concrete bit, drill 10 holes into the concrete wall all around your window. Each hole should be 2" to 3" from the edge of the window to keep the concrete from chipping or breaking. Insert the 5/16" x 3" hanger bolts in these 10 holes.
After careful measurement, drill ten 5/16"-diameter holes into the plywood shutter to correspond precisely to each of the 10 hanger bolts you just installed. Slide the plywood over the protruding ends of the hanger bolts, place a washer on each bolt and then fasten tightly with the ten 5/16" wing nuts.
For an alternate method of fastening a plywood shutter to a concrete structure, drive the 1/4" concrete screws through the plywood shutter and into the concrete block wall of the house, again making sure the screws are 2" to 3" from the edge of the window to prevent the concrete from chipping.
Note: A handy kit (KwikTap) includes everything you'll need in a single box -- a concrete bit, concrete screws and Phillips-head driver bit.