Here is a chart that compares the construction requirements of either an EcoShell I or an EcoShell II to that of a conventional concrete structure. Please note: conventional buildings require 200% to 300% more concrete, 300% to 400% more reinforcing bar and double the labor. But ironically, it’s the EcoShell that has the strength to withstand natural disasters.
| Type |
Size |
Floor Area |
Interior Volume |
Surface Area |
Concrete Needed |
Rebar Needed |
| Dome |
20'd x 11'h |
314 sq. ft. |
2,408 cu. ft. |
690 sq. ft. |
8 cu. yd. |
1,250 lbs. |
| Square |
18' x 18' x 8' |
324 sq. ft. |
2,592 cu. ft. |
900 sq. ft. |
22.7 cu. yd. |
4,900 lbs. |
| Difference |
-10 sq. ft. |
-182 cu. ft. |
-210 sq. ft. |
-14.7 cu. yd. |
-3,250 lbs. |
| Dome |
30’d x 13’h |
707 sq. ft. |
5,744 cu. ft. |
1,238 sq. ft. |
24.1 cu. yd. |
2,500 lbs. |
| Square |
24′×30′×8′ |
720 sq. ft. |
5,760 cu. ft. |
1,584 sq. ft. |
42.7 cu. yd. |
9,200 lbs. |
| Difference |
-13 sq. ft. |
-16 cu. ft. |
-346 sq. ft. |
-18.6 cu. yd. |
-6,700 lbs. |
| Dome |
40’d x 16’h |
1,257 sq. ft. |
12,197 cu. ft. |
2,060 sq. ft. |
30 cu. yd. |
4,200 lbs. |
| Square |
24′×52′×18′ |
1,248 sq. ft. |
9,984 cu. ft. |
2,464 sq. ft. |
68.8 cu. yd. |
13,300 lbs. |
| Difference |
9 sq. ft. |
2,213 cu. ft. |
-404 sq. ft. |
-38.8 cu. yd. |
-9,100 lbs. |
