Thank for the reply. The green house that I've bought is glass. The pavment is flat. What is the reason of greenhouse attaching to the ground? is it only for Stability. I have two mini greenhouse (the plastic one) and with nothing attached to them they are fine in our garden. Unfortunatly we do not have much soil/grass area in our garden and the ground is all concrete. And if i have to drew hole on the paving area, my husband just worried it will damage the pavment. I just want an area to grow some veg.. being a beginner i should have done more research before getting a greenhouse. feel really stupid now.