Special Sealant Groove

Sealant must be made of quality material and be correctly installed to provide long term weather tightness.
To ensure the proper placement of sealant, all Butlerib II roof panels are engineered and produced with a "Sealant Groove" to assure accurate and pecise placement of sealant material.

See the difference.......!

Return Leg Provides Support

To provide added support support against roof traffic, Butlerib II roof panels incorporate a "Return Leg" feature that assures a proper fit and positive seal at side-lap connections. Roof panels of other systems without this return leg feature often separate under fastner installation or roof traffic pressure, increasing the probability of roof failure and leaks.

Roof systems MR-24®

The MR-24 Roof

is an exclusive single skin metal roof, covering your entire building, with a unique method of connecting roof panels, and panels to roof purlins (roof structural).

There are no fastener holes except at the eave and, if needed, when a panel splice occurs. The panels are joined together with Pittsburgh double lock standing seam, and to purlins with a unique clip formed into the seam.

The industry's most specified roof system, with field proven record since its introduction in 1969; it carries a U.L. Class 90 wind uplift rating.

Weathertightness

You are assured of weathertight performance because of Butler's exclusive Pittsburgh double lock standing seam. During installation, the edges of each roof panel are joined and mechanically turned 180 degrees by the "Roof Runner", a portable roll forming machine, completing a full 360 degrees seam.

The seam stands 2-3/4" above roof's surface to prevent leaks caused by water run - off. Inside the seam, factory applied sealant eliminates the chance for even tiny capillary leaks.

Cross Section of MR-24 panels in position for seaming	Roof Runner seamer compressor panels together to form a weathertightness seal	Finished Pittsburg double-lock standing seam

Standing Seam
Roof systems CMR-24®

The CMR-24 Roof

is designed primarily for distribution centers, warehouses and strip shopping centers. Steel liner panels provide increased durability and finished interior appearance. Rigid Board insulation provides excellent thermal performance without energy-leaking thin spot. Finally, the MR-24 system serves as the roof's weathering membrane. So, all of the weathertightness, wind uplift, expansion and contraction and roof alignment benefits found in the MR-24 roof can also be found in the CMR-24 roof.

Wind Uplift

Both the MR-24 and CMR-24 roofs carry the highest rating awarded by Underwriters Laboratories for wind uplift: the Class 90 rat ing. In many locales, this rating will result in lower insurance premiums for new buildings.

Roof Movement

The natural forces of expansion and contraction are often the cause of many roof leaks. As
temperatures change, the roof expands or contracts. Unless the roof is designed to
accommodate this movement, fasteners will work loose on metal; and roof-cracks, blisters and splits will appear on built-up roofs. The MR-24 and CMR-24 roofs are designed to
accommodate roof movement. They are attached to the building's structure with a special clip and tab assembly that is formed into the double lock seam. Because the tab can move within the clip, the entire roof can expand and contract freely, with-out sacrificing structural integrity.

Energy Savings

While most systems are intended to save energy, few actually do so with-out problems. For example when thicker insulation is used on convention-al built-up roofs, fuel bills may be reduced, but the additional insulation may also speed up the inevitable deterioration of the roof surface. Because both MR-24 and CMR-24 roofs are metal and move freely with the forces of expansion and contractions, insulation thickness will not cause roof deterioration.

Re-roofing

With Butler Roof Systems Most roof repairs are really only temporary solutions. By their very
nature, most built-up roof systems ultimately leak.
There is a long-term solution to roof problems; re-roofing using the MR-24 standing seam roof system.
Roofs leak because the forces of expansion and contraction literally tear holes in the surface. TheMR-24 roof system is designed to move with those forces. Special sliding tabs in the clips allow the roof to freely move up to 2 1/2" (63mm) and the clips securely hold the roof panels to supporting structural members.

Each MR-24 roof panel is seamed to the adjoining panel to form a single, monolithic steel membrane covering your building. The weather tight seam is special—a full 360° Pittsburgh double-lock standing seam.

Because the MR-24 roof system is aluminum-zinc coated steel it won't crack, peel or decay like many built up roofs. That means virtually no maintenance bills in the years to come.

In most cases you can install the MR-24 roof system right over your existing built-up, single ply or metal roof.
You save on labor costs needed to tear off your current roof and interrupt your business activities during the process.
You may even find re-roofing can increase your building's energy efficiency. Most energy loss occurs through the roof. Adding insulation under the MR-24 roof system can result in lower utility bills.
Lower maintenance cost, weather tightness, easy installation energy savings—the MR-24 roof
system is a long term solution to your roof problems.

More information:
www.butlermfg.com