Roof replacement in Montgomery, AL by Montgomery's best roofing contractor. We installed a layer of 1/2" OSB plywood because the existing 3/8" plywood deck could not adequately support a new architectural roof system. We insalled custom wide eave drip flashing to cover the extra 1/2" roof deck. Then, a layer of sythetic underlayment and GAF Timberline HD architectural shingles. This is a GAF Systems Plus Warranty roof system.