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.
G60 or g90 for metal roof.
It means that there will be 9 oz total weight of zinc per square foot.
Material is typically in stock in 20 gauge g90 or gray primer in 36 cover width.
They are available for immediate pick up on the smaller projects.
If it is for outdoor use or in a high moisture environment i would always specify g90 just because it seems to make a difference over time.
This is in accordance with the guidelines for residential metal roofing published by the metal construction association.
Steel deck also can be furnished with bright white primer bottom sides and either primer painted or galvanized topsides.
Zinc coating weights are measured in ounces per square foot and range from g90 to g60 g40 and g30 galvanized steel.
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.
Availability for galvanized g60 metal decking most metal deck distributors have a large selection of panels and gauges in this finish.
Larger projects typically have a 2 3 week lead time.
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.
Type f metal roof deck is available in 22 20 18 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.
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.
For houses the mra recommends a minimum of g 90 be used.
The galvanized finish is available in g30 g40 g60 and g90 coatings.
It is a coating thickness designation in the galvanizing specification astm a653.
The g60 is the most common galvanized metal and determines the amount of galvanize on the metal.
For metal roof coverings ac166 dated october 2012 editorially revised june 2015.
Galvanized g90 metal deck g90 is a specification for hot dip galvanizing.
Material is typically in stock in 22 20 gauge g90 or gray primer in 36 cover width.
The greater the number the longer the protection against rust will last.
