The current idea for the 16' x 16' platform is a composition of rigid insulation and dry-set block that will act as a thermal mass. A geotextile layer underneath will prevent the sand dry-set from mixing with the soil below when the structure is relocated. Our greenhouse enclosure could then be designed to slip over the 7" curb around the perimeter of the pavers. I built this system into our rhino model to tally up the block count and material costs.
HIGH MARKET COST (ie. HOME DEPOT):
concrete block (288) @ $1.25/ea = $360
1" rigid insulation (16) 2'x8' sheets @ $9/ea = $145
geotextile 4' x 100' roll (1) @ $50/ea = $50
sand (10) 50 lb bags @ $3.34/ea = $35
+ rental of a tamper tool/some ingenious soil leveling system. (rolling barrels?)
+ rental truck (or delivery)
I would really like to find an alternative to Home Depot. Procuring these materials from HD would exceed $600. This platform is easily assembled with a team and would be fairly stable, but only marginally mobile. The re-use of the material is high.
Anyone want to help find these materials from a different source? Other thoughts about the platform design?