Whether your project is new construction, an addition, or repair, rely on MFM Building Products for the best in underlayment technology solutions. Our family of self-adhesive, self-sealing membranes offers it all: unmatched selection, proven performance, and ease of handling and installation. The days are long past when fully adhered underlayments were limited to key "problem" areas such as flashing, valleys, low slopes and pitches. Today’s underlayments are called upon to provide a trusted line of defense against water damage across the whole roof deck in the event the main roofing material fails. The choices are complex, involving all kinds of roofing materials, all kinds of substrates, and all kinds of climates. MFM underlayments help you match performance and cost factors for virtually every job.