A Thybar TC-3 insulated roof curb for Single-Ply roofing. Lightweight fill or tapered insulation. Made with Prime G-90 Galvanized Steel 18 gauge with fully welded and mitered corners Comes with factory-installed 2" x 2" wood nailers, and base flange attachments for securing to the building structure 1 1/2" thick 3 lbs density fiberglass insulation 15.5" long x 15.5" wide x 18" tall Outside Dimensions

A Thybar TC-3 roof curb, available in 12" or 18" heights.