Domes are vulnerable to water damage, so what to do in rainy climates? I say add a roof. There are various roofed dome houses on our main website at EarthbagBuilding.com that you peruse here and here. Those are earthbag domes. The design I’m first presenting here is made of ferrocement. It’s just one more way to do things.
Ferrocement domes are prone to overheating because they’re exposed to direct sunlight, so I added a roof with good sized roof overhangs, a sloped ceiling with roof vent so hot air will naturally escape through the top, and exterior cladding of plastered low fired brick. A ½” gap between the ferrocement and brick helps prevent overheating and moisture problems from driving rain.
Basic building info:
– concrete foundation
– ferrocement shell (rebar, mesh and cement)
– rebar truss roof coated with mesh, cement and roof coating or possibly red clay tiles
– perlite insulation in truss
– low fired clay brick on exterior walls with rain screen (gap between brick and ferrocement)
– lots of arched doors and windows for good ventilation (round windows no problem)
– low fired brick or wood nonloadbearing partition walls are optional
– concrete or soil cement floor with iron oxide stain or tile with moisture barrier underneith