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Home > Building Systems > Roof Systems > MR-24

The MR-24 roof system is specifically designed for consistent weathertight performance under demanding conditions and to accommodate roof movement.

Roofs expand and contract with daily and seasonal temperature changes. Unless your roof is designed as a system to accommodate this movement, fasteners will loosen on metal roofs, and cracks, blisters, and splits will appear on built-up roofs.

The MR-24 roof system is attached to the building's structure with a special clip-and-tab assembly formed into the double-lock seam. Because the tab can move within the clip, the entire roof can expand and contract freely without compromising structural integrity.

Butler's exclusive Pittsburgh double-lock standing seam (shown below) assures consistent weathertight performance-virtually eliminating leaks!

Independent surveys show that the MR-24 roof system is the most specified standing-seam roof on the market, with more than 2 billion square feet installed since its introduction in 1969.

Energy Savings

Because the MR-24 roof system is metal and moves freely under the forces of expansion and contraction, additional insulation thickness will not cause roof deterioration as commonly happens with conventional built-up roofs.

Also, when metal roofs are installed, insulation often is crushed at points where the roof is fastened to the structural members. At these points, a thermal short circuit is created. The MR-24 roof system has special thermal blocks to rectify this problem.

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