I feel like there was a ton of non-answering in this video. UL 790 is not a mystery. It's easy to find details on how the testing is done and even videos of it being performed. Metal roofing is a wonderful thing, but I have never seen a metal roofing panel that passed (class A) UL 790 without an additional thermal barrier such as gypsum to prevent heat transfer to the wood roof deck. Many asphalt shingles achieve class A directly on wood decking. That's just reality. I'd love to see more content on your channel focused on how to correctly build class A metal roof assemblies instead of dancing around the fact that it's more complex than shingles.
Whew, a lot of dancing around the subject there. As I plunge into needing to reroof my house, as well as building a new workshop, there are a lot of considerations that come up. During a burnover, it can be mighty hot. 800°C, or 1500°F, or higher. The steel can deform. Hot enough to ignite wood with heat transfer. However, while air circulation is good for some things, it can be really bad with respect to fires. Even if the roof needs replacing after the fire, if it protects the house, it has done its job. Individuals or insurance companies would much prefer to pay $20K to $50K for a new roof than more than $500K or more for a new house. Anyway, as others mentioned, it would be nice to have a better description of building a wildfire resistant roof and overall building structure.
I feel like there was a ton of non-answering in this video. UL 790 is not a mystery. It's easy to find details on how the testing is done and even videos of it being performed. Metal roofing is a wonderful thing, but I have never seen a metal roofing panel that passed (class A) UL 790 without an additional thermal barrier such as gypsum to prevent heat transfer to the wood roof deck. Many asphalt shingles achieve class A directly on wood decking. That's just reality. I'd love to see more content on your channel focused on how to correctly build class A metal roof assemblies instead of dancing around the fact that it's more complex than shingles.
Whew, a lot of dancing around the subject there.
As I plunge into needing to reroof my house, as well as building a new workshop, there are a lot of considerations that come up.
During a burnover, it can be mighty hot. 800°C, or 1500°F, or higher. The steel can deform. Hot enough to ignite wood with heat transfer. However, while air circulation is good for some things, it can be really bad with respect to fires.
Even if the roof needs replacing after the fire, if it protects the house, it has done its job. Individuals or insurance companies would much prefer to pay $20K to $50K for a new roof than more than $500K or more for a new house.
Anyway, as others mentioned, it would be nice to have a better description of building a wildfire resistant roof and overall building structure.
what about monier roof?
Agree, please explain how to actually build a class A assembly using one or two common types of metal roofing
Yeah, nowadays, the blue roofs are the ones that dont burn.