Environmentally Friendly Subfloor From: Kris mcGee Product: Sigma Urban (Gen III) We use repurposed skids to build the subfloor off the ground, reclaimed plywood and recycled car tire mats!! Customer Photos Greenhouse From This Story Sigma Urban (Gen III) 55 psf (265 kg/m²)Snow Load Sigma Urban (Gen III) Size: 10' × 13' × 7' Regular price $3,250 USD Regular price $3,450 USD Save $200 Sale Sale price $3,250 USD Unit price / per Sold out View Greenhouse → More Reviews from