I am a property owner who allows his tenants to use the roof of a two car garage as outdoor space. They have some furniture, planters and grills up there to get the most out of the space. I am aware that these items can cause damage to the roofing surface (Modified Bitumen) and am looking for recommendations on what is the best, cost effective padding to place under the feet of these items to protect the modified. I know that ultimately the best way to protect the roof is to disallow use or build a deck, but the deck is too costly and I like offering the outdoor space to maximize rents. Any advice would be greatly appreciated!