A green roof is also a possibility for a flat roof. Be on the lookout for cracks, blisters, lacking shingles and other indicators of harm. For instance if you have small kids in the house. Also, inflatable seaside balls stuffed in lockers and then inflated are inexpensive and safe. https://njspmaca.in/2024/06/27/an-over-view-of-rubber-epdm-and-epdm-flat-roofs-3/