A high-quality commercial roof is more than the shingles you see from the ground. Beneath every premium roofing system is a critical layer of protection known as roofing underlayment. During the commercial reroof at First Interstate Bank in Great Falls, Montana, Montana Pro Contractors installed premium Malarkey roofing underlayment as part of the new Class 4 Malarkey Vista® AR architectural asphalt shingle roofing system. This additional protective layer provides enhanced waterproofing, improved weather resistance, and long-term protection for one of the building's most valuable assets. Following the complete demolition of the existing 23,000-square-foot commercial roof, our team carefully inspected the roof deck and prepared a clean, structurally sound surface before installing the new underlayment. Proper preparation is essential because roofing underlayment serves as the secondary water barrier between the roof deck and the finished shingles. Even the highest-quality architectural shingles perform best when installed over a premium underlayment designed to resist moisture intrusion and protect the building during severe weather. Premium Malarkey roofing underlayment provides an additional layer of defense against wind-driven rain, snow, ice, and moisture while helping protect the roof deck during the installation process. In Montana's demanding climate, where buildings experience heavy snowfall, high winds, hail, freeze-thaw cycles, and rapid weather changes, this secondary moisture barrier plays a vital role in maintaining the long-term performance of the entire roofing assembly. Our commercial roofing professionals installed the underlayment with precise overlaps, secure fastening, and careful detailing around valleys, roof penetrations, flashing transitions, ridges, and eaves. Proper installation creates continuous protection across the entire roof surface while helping prevent water intrusion in vulnerable areas. Every seam, transition, and detail was completed according to manufacturer specifications to ensure the roofing system performs as a complete, integrated assembly. Roofing underlayment also improves the overall durability of the roofing system by protecting the structural deck from temporary weather exposure during construction and serving as a backup layer of protection beneath the finished shingles. This added level of security becomes especially valuable during Montana's high winds and severe weather events, where wind-driven rain or ice can challenge every component of a roofing system. The installation of Class 4 Malarkey Vista® AR architectural shingles over premium Malarkey underlayment created a complete commercial roofing system engineered for exceptional performance. Together, these premium materials provide outstanding wind resistance, impact protection, waterproofing, and long-term durability while enhancing the appearance and value of First Interstate Bank. At Montana Pro Contractors, we believe every layer of a roof matters. From the roof deck and underlayment to flashing, ventilation, and premium roofing materials, every component contributes to the lifespan and reliability of the finished roof. That's why we never overlook what lies beneath the shingles. Quality materials, proper installation, and attention to detail are what separate an average roof from a roofing system built to perform for decades. As a trusted commercial roofing contractor serving Great Falls and communities throughout Western Montana, Montana Pro Contractors specializes in commercial roof replacement, architectural asphalt shingle roofing, EPDM roofing, TPO roofing, commercial metal roofing, roof inspections, and complete exterior renovations. Whether installing a premium roofing system for a bank, church, office building, retail center, or industrial facility, our team is committed to delivering workmanship and materials designed for Montana's demanding climate. Montana Pro Contractors — Covering Western Montana.