For houses the mra recommends a minimum of g 90 be used.
G60 or g90 for metal roof.
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.
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.
Galvanized g90 metal deck g90 is a specification for hot dip galvanizing.
The g90 would be more galvanized coating than say g60.
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.
The greater the number the longer the protection against rust will last.
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.
For agricultural applications galvanizing levels called g 40 or g 60 may be used quite successfully.
Zinc coating weights are measured in ounces per square foot and range from g90 to g60 g40 and g30 galvanized steel.
It is a coating thickness designation in the galvanizing specification astm a653.
G90 is not a galvanizing specification.
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.
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.
Material is typically in stock in 20 gauge g90 or gray primer in 36 cover width.
The g60 is the most common galvanized metal and determines the amount of galvanize on the metal.
The galvanized finish is available in g30 g40 g60 and g90 coatings.
They are available for immediate pick up on the smaller projects.
7 0 identification 7 1 the panels are identified with a label bearing the.
Larger projects typically have a 2 3 week lead time.
