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Optimal grade for earth berming?

 
Brian Brown
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I am planning a PSP structure for the spring/summer with an attached underground green house. On my property in Montana I have lots of options on locations with southern exposure and I was wondering if there was an optimal grade to build into? I have everything from completely flat to nearly twenty percent available. I will be removing trees wherever I build and using a d-4 dozer for the dirt work if that is a concern. Is there an optimal grade?
 
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