Ultra HT Wind & Water Seal, from MFM Building Products, is a 45-mil, self-adhering underlayment for use in steep-slope roofing and re-roofing applications. The product features a cross-laminated polyethylene film with a traction coating for excellent walkability. The high temperature mastic is rated up to 250°F for use under metal roofing systems. Ultra HT received a UL Listing as a Class A fire resistant barrier when used in conjunction with 24 GA minimum steel or 16 oz. copper UL listed roofing panels per UL 790. mfmbp.com
Ultra HT Wind and Water Seal

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