I'm researching what type of roof system I want to use for my ICF house.

I want to build a structure that will be very strong, energy efficient, and easily last over 100 years.

I have lots of info on various concrete roof systems, but not much on steel. What about some type of heavy-duty steel trusses with 1/4" steel on top? Even that probably wouldn't be as strong as 4" of reinforced concrete.

Sorry for the newbie question, I'm just trying to figure out if it's worth researching more on steel roofs. Thanks.

I know it has been a while, but I see that noone has posted a response.

I'm in tornado alley, and I am likewise looking for a strong roof to go with my ICF or comparable walls.

I am leaning towards a metal SIP roof, because I get the high wind rating strength AND I can have cathedral ceilings for more finished attic space. 

I wonder how fast steel SIPs lose strength in a fire.

As I understand it, steel SIPS are class 1 fire rated, are more resistant to flame spreading than most alternative building materials, and generate less smoke during a burn.

Obviously, a concrete roof would be superior [if you can afford it (increased labor & equipment, as well as material costs), if the structure below is designed to handle the loads, and if the slope of the roof allows it],

A Steel SIP roof seems like an affordable compromise for my design plans... Goes up quickly limiting labor expenses. lighter weight than an OSB SIP for easier installation, a decent enough class 1 fire rating, and high wind/storm resistance.

If I could afford a concrete roof, I would certainly consider it.

This could give you some ideas. This is a 2,000 sq.ft addition (2 story) on the back of a 2000 sq. ft house. The floor and the roof are poured reinforced concrete over WRCS insulated forming panel system. The panel price includes the structural engineering and shoring design on the roof and floor.

 

This is what they made in the interior, planing to have the cathedral ceiling in some areas.

I will post pics later of ICF walls with this system.

Regards,