The gauge of a metal roof refers to its thickness and the higher the gauge the thinner the metal.
Roof thickness mm.
The thicknesses are listed below.
The min thickness of the roof slab should be 6 inches and maximum it can go up to 13 14 inches for span up to 7 m long.
Four are epdm membranes and the fifth is a polyurathane liquid.
Standard asphalt shingles add very little thickness to the roof because a standard three tab shingle is about 3 16 inch thick.
When installed however the shingles overlap doubling the thickness.
1 2mm standard 1 5mm commercial resitrix.
The thickness of aluminum roofing sheet in most nigeria market ranges from 0 7mm to 1mm thickness the thicker the roofing sheet the costlier it will be.
Other types of shingles including number 1 wood cedar shake and tile are thicker although the thickness depends upon the individual brand of shingles you select.
So bad contractor could quote 1mm thickness during contracts bidding and use 0 8mm thickness without the knowledge of the client.
Each gauge represents a nominal decimal range.
A good contractor will clarify the client with different ranges of aluminum roofing sheet thickness in the market and their cost while a bad contractor will not do that.