Building an Earthbag & Stone Rainwater Storage Cellar

I decided to build a simple recessed cellar in my yard that would serve a variety of functions, including rainwater storage, root cellar and space for vermiculture (worm bins). All of these require relatively cool but not freezing conditions, so digging into the ground was a good way to accomplish this. It seemed like the easiest approach would be to build this primarily with earthbags. You can read all about how I accomplished this at http://earthbagbuilding.com/articles/raincellar.htm

Would roof insulation help?

Yes, indeed, roof insulation is critical with this design. I used some surplus 6" fiberglass batt insulation that was given to me.

What are the inside vs outside temps like?

It looks beautiful! Great work!!

We live at 6,000 ft. in Southern New Mexico where winter temperatures drop well below freezing and summer temperatures can get up over 100 degrees F. The cellar has ranged between about 36 and 78 degrees F., so an average of about 57 degrees F.