Half Pipes can be placed on grass, dirt, gravel or concrete. We do suggest elevating the ramp above surface level to avoid future undercarriage damage with concrete pavers, which also helps with minor leveling. The surface has to be as level as possible. Quarter Pipes need to be placed over concrete, cement, or asphalt. Fortunately, the quarter pipes are mobile and can be moved in and out of the garage, driveway or side yard.