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The Union Corrugating MasterRib is a 29-gauge Galvalume steel panel with 3/4-inch raised ribs and 36-inch coverage, sold for roofing and siding. It is an exposed-fastener panel, so screws go through the face of the sheet, and it can be laid over existing shingles. It is the common choice for sheds, garages, porches and budget residential re-roofs, where it competes with standing-seam and thicker 26-gauge panels on strength and hidden fasteners. Reviewers of this class of panel like the fast coverage and simple install but warn that thin 29-gauge steel dents and that exposed screws need watching.
In stock
Lowest price we've seen: $48.48 on Nov 11 at Arbor. Tracked across 1 store since Nov 11.
Owners of MasterRib-type panels report fast installs and good coverage on sheds and cabins, and most are satisfied for the money. Complaints center on thin steel that dents and on screws and washers that leak or back out over time.
This is a 29 gauge MasterRib roof panel made of Galvalume-coated steel. It has extra wide ribs that stand 3/4 inch high for added strength. An oversized anti-siphoning channel adds leak resistance.
The panel provides 36 inches of coverage and uses an exposed fastener design. It meets UL 2218 impact resistance standards. It can be installed over shingles on roofs with a minimum recommended pitch of 3:12.