Mabati Gauge Explained: What the Numbers Really Mean
Mabati gauge is the thickness of the steel sheet. The lower the number, the thicker and stronger the sheet. Gauge 28 is thicker than gauge 30, which is thicker than gauge 32. Thicker sheets cost more and last longer. Below is the thickness table and how to confirm the gauge you are getting.
Gauge is the most misunderstood word in buying mabati, and the one most often used to short-change a buyer. Get it right and you are much harder to cheat. Here is the plain explanation.
What gauge actually means
Gauge is the thickness of the steel sheet. Counter-intuitively, the lower the number, the thicker the steel. So gauge 28 is thicker than gauge 30, which is thicker than gauge 32. Thicker steel costs more, resists dents better, is quieter in the rain and lasts longer.
The thickness table
| Gauge | Approx steel thickness | Typical use |
|---|---|---|
| Gauge 32 | ~0.20mm | Budget, stores, temporary structures |
| Gauge 30 | ~0.30mm | The standard house roofing gauge |
| Gauge 28 | ~0.40mm | Permanent homes, coastal and high-rust areas |
Exact thickness varies slightly by manufacturer and coating, so ask the company to confirm in writing what they actually supply.
The gauge trick to watch for
The most common mabati complaint is thinner steel sold as a thicker gauge. The difference of a tenth of a millimetre is nearly impossible to judge by eye, so a thin sheet can be passed off as a thicker one. Protect yourself three ways:
- Ask for the gauge and steel thickness in writing before you pay.
- Be wary of an unusually low price for a thick gauge. If one quote is far below everyone else’s for the same stated gauge, ask what thickness it really is.
- Buy from a company with a claimed, well-reviewed Google profile so there is accountability if the delivered sheet is not what was agreed. Our directory shows review scores and links to each company’s own site.
So which gauge should you buy?
For most homes, gauge 30 is the right answer: strong enough, widely available and reasonably priced. Choose gauge 28 when the roof needs to last decades without attention, when the house is near the coast or in a high-rust area, or when quietness in heavy rain matters to you. Choose gauge 32 only for stores, temporary structures or the tightest budgets, and expect a shorter life.