Wall types for bermed naturhus
Hello, I am designing an earth sheltered naturhus for my senior project and would appreciate you thoughts.
Location: Boulder, Colorado, Zone 5, Granular soil type, South facing mountain, Elevation 8,000
The design consists of a half dome that encases living structures, see section cut in attachment. The N, E, & W sides of the living units are surrounded by earth to help regulate temperatures. From what I understand, these wall types will need to be highly insulating and have a thermal break in-between the ground and wall. I saw on your other comments that this Zone type would require a “~27% of the total R to be on the exterior of the sheathing. So if you have 9.5″ of R3.7/inch dense packed cellulose that yields a cavity-fill R of about R35, which means you would need ~ R13 of exterior R to gain that resilience”. Since the entire structure is encase within a glass dome to create a microclimate, how much effect with this alternate climate have on the insulation requirements? Or is it more so determined by the soil temperature? The greenhouse will create a microclimate between ~60-70 degrees. I plan to use rammed earth blocks for the south facing walls/floor to regulate temperatures through thermal mass. I am trying to decide on materials for the N, E, W walls and roof. Do you have any thoughts on this? I am also trying to minimize concrete use as much as possible. Thank you!
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