Steel comes in many different gauges, levels of quality, and types, but not all are suitable for doors: galvanized steel is typically used for entry doors.
While stainless steel is more robust, galvanized steel retains much of the same strength. Where it outstrips stainless steel is in its malleability and resistance to rust. It is easier to work with and, therefore, easier to use in more complex entry door designs, giving you a greater variety of styles to choose from.
Keep in mind that the door isn’t entirely made of steel – the weight of that would rip the door from its hinges, never mind the insulation issues – but is fortified with a front and rear layer of metal. There is typically a layer of polyurethane between the two layers to provide insulation. The quality of these steel layers will be the deciding factor in matters of security and durability.
16 to 24-gauge steel can be commonly found in steel doors, with 24 the weakest and 16 the strongest on the gradient. We find that 20 gauge steel marks a sweet spot between strength and price point – for many people, 16 gauge steel would be prohibitively expensive.
24 gauge is the standard most often found in steel doors, but a 20 gauge steel door uses 49% more galvanized steel – making it more secure.
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