There was a total system failure with the old EPDM roof. We removed roof and vapor barrier down to concrete deck. Next, we installed new vapor barrier, ISO insulation, ½ in fiberboard, as well as a 25 Year No dollar Limit modified hot tar built up roof. As well, their skylights were leaking, the problem was solved by screwing 22 gauge B decking in place, next, over the B decking we installed two layers of two inch ISO insulation, then we installed a Garland Colonial Red Standing Seam Metal roof, which has changed the appearance of the building vastly. What a beautiful job.