Roofing options

[Jay Bondesen]

I don't have a good picture of what you mean by a layer of cement over burlap over framing. Cement is a rigid material and usually cracks unless cured in a controlled environment. It's almost always coated with something else to make it waterproof. Concrete can certainly be safe structurally, and termites won't eat it, but a specific mix and seamless application possibly with steel reinforcing would be difficult to do and probably too heavy for burlap to support. The spray foam I used was lightweight and easy to waterproof. There are folks who do concrete domes with inflatable structures and gunnite equipment, spraying the concrete on. They use the air-form and air pressure to support the concrete until it cures.

Jay