G60 Or G90 For Metal Roof
Bf 36 Cellular Metal Roof Decking 1 1 2 Depth 36 Coverage 5 To 12 Optimal Span S Standard G60 Galv Galvanized Metal Roof Metal Roof Perforated Metal
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Material is typically in stock in 20 gauge g90 or gray primer in 36 cover width.
G60 or g90 for metal roof. G90 is not a galvanizing specification. 7 0 identification 7 1 the panels are identified with a label bearing the. Astm a653 ss grade 33 g601 or g90 0 0356 20 gauge 16 magna loc180 18 magna loc180 12. It is a coating thickness designation in the galvanizing specification astm a653.
It means that there will be 9 oz total weight of zinc per square foot. Type a metal roofing deck is available in 22 20 18 and 16 gauge with either a galvanized g60 or g90 finish or prime painted gray or white to inhibit rust while in transit primer is not a finish coat. Galvanized g90 metal deck g90 is a specification for hot dip galvanizing. For houses the mra recommends a minimum of g 90 be used.
The galvanized finish is available in g30 g40 g60 and g90 coatings. This is in accordance with the guidelines for residential metal roofing published by the metal construction association. G90 galvanized steel has a longer service life than g60 g40 and g30 galvanized steel because g90 galvanized steel has a heavier coating weight of zinc applied to it at 0 90 oz ft 2 as opposed to g60 galvanized steel at 060 ox ft 2 and. They are available for immediate pick up on the smaller projects.
Zinc coating weights are measured in ounces per square foot and range from g90 to g60 g40 and g30 galvanized steel. The g60 is the most common galvanized metal and determines the amount of galvanize on the metal. Steel deck also can be furnished with bright white primer bottom sides and either primer painted or galvanized topsides. Availability for galvanized g60 metal decking most metal deck distributors have a large selection of panels and gauges in this finish.
The greater the number the longer the protection against rust will last. Material is typically in stock in 22 20 gauge g90 or gray primer in 36 cover width. For metal roof coverings ac166 dated october 2012 editorially revised june 2015. The g90 would be more galvanized coating than say g60.
For agricultural applications galvanizing levels called g 40 or g 60 may be used quite successfully. The primer painted finish protects the steel for a reasonable installation period while exposed to ordinary atmospheric conditions and shall be considered an impermanent and provisional coating.
