Here’s a very low cost vault roof that’s suitable for sheds and developing countries. The cardboard prevents the cement from falling through.
vault
DIY Ferrocement Domes and Vaults
“The “Green” movement has its roots in the late 60’s with the “back-to-the land” movement—-when people really started to think not just about alternative life styles but different methods of building—-including sustainability. It could easily be argued that the father and mother of the back-to-the-land movement were Helen and Scott Nearing.
Toda Huts
“The Todas live in small hamlets called munds. The Toda huts, which are of an oval, pent-shaped construction, are usually 10 feet (3 m) high, 18 feet (5.5 m) long and 9 feet (2.7 m) wide. They are built of bamboo fastened with rattan and are thatched.
Brick Barrel Vaults
Consider making a brick barrel vault in your dream home. It definitely has a wow factor. The links below show more ideas.
Vaulted Roof Technique
“The vaulted roofing system using conical tile has been developed and used by Centre of Science for Villages, Wardha, Maharashtra for the last four decades. The roof is easy to construct and uses local materials and skills.”
Minnesota Strawbale: Fruits of our Labor
“The first structure we built on our 9 acres was the tool shed. (After it served its purpose for storing tools it became a chicken coop, then a mini art studio and is now a sauna!) The second structure we built was this outbuilding that we call The Shop (pictured above). On the ground floor is Ken’s custom cabinetry workshop. He is a true craftsman. The upstairs portion is used for storage, although I imagine a remote guest quarters or art studio as another use for that space.”