The metal ones do last longer; however, you are then faced with cleaning them of dust and dirt. 

It's a 4 Br/1 bath 2 story house with a good metal roof.

Some very smart money people (billionaires) are buying precious metals like crazy, and that's not a good sign for what they think the value of the dollar will be.

The building was build in the 40th and maintained most of its original beauties: red tile roof which is leaking and the roof support shows signs of giving up, original electrical system without ground wires, rotted floor joist, original metal windows.There are 8 units in the apartment and I paid about $37k per unit.  

Asking $ 850,000 Final offer excepted $650,000 Build in 2009 , all stucco , and glass front ,no metal .

I was in mine here for over a year and met all kinds of people at all stages of investing, as well as vendors, lenders, etc.As for your house hacking idea, which is a fantastic one, there are loans you get as a first time homeowner (FHA) and loans you can get specifically to house hack.

A steel fabrication tenant will need to comply with runoff of cleaning materials and heavy metals, safety issues with welding gases, OSHA requirements applicable to the structure (safety rails, overhead beam loads that are part of the building structure and used for cranes and lifts).

In addition to the extra layer of drywall and sound insulation there are vibration clips that are installed under the joists and then a metal furring channel is installed running the length of the ceiling.

So I grew up with a contractor as a father that built design metal buildings.

We live in Texas and plan on building metal frame homes.