East Mesa Detention Facility San Diego. 53,824sq ft Standing Seam Metal Roofing & 11,000sq ft Thermoplastic Membrane. This new addition to the East Mesa Detention Facility required high propensity to detail. This site was occupied and had various restrictions for whom had access. Extreme caution was taken for entering the location with our personnel and suppliers. The design specified for a monolithic membrane and sheet metal roofing.