This picture is one of me greenhouses,nothing special,just made out of 2x4's and plastic.It is fastened down though,if it was'nt,it would probably end up in Saskatoon with the wind w r e get in Calgary.The footings are held down with 4 foot... rebar hammered into the ground,then the greenhouse is bolted on top of that.The plastic is vapor barrier plastic that is used in houses,i chose that because the hail stones won't break it,they just bounce off.It is 8 feet wide,room for a 2 foot wide walkway and 2 rows of tomato's down each side.I need to put up one more greenhouse for next year though.