Lowtech Graph lists low-tech options for every need of a home. Here you can compare them, find tutorials to build them, and link them together into a circular system. Why low-tech?
Passive
Note: Cost, carbon and footprint are broad judgements against comparable building approaches, not measured figures.
A roof covering made of metal or fibre cement, strong enough to take the impact of hailstones. Hard sheets spread the blow instead of cracking the way thin tiles or slates can. The roof stays watertight after a hailstorm, so the rooms below stay dry.
This is contracted work rather than a self-build.
none
The only option catalogued for this need so far, so there is nothing to compare it against.
We don’t list sizing or quantities, as the yield of each technique depends on the quality of its build. The catalogue compares options but doesn’t dimension them. Regulatory notes are indicative, with a French example, and need to be confirmed locally.