Still going to need to know what's covering up the foam.
Hot mop, PVC, EPDM ECT.
It not going to be a DIY job in any case. If it was mine I would only let a company that does commercial roofing do it. But ha that's just me.
Commercial roofers do far more flat roofs. And with any flat roof it's not if it's going to leak but when.
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