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Terne II® - ZT® Alloy Coated Steel
Terne II® is the improved version of historic terne metal, which has been used extensively throughout colonial and modern America. While it retains all the time-tested qualities of the original lead/tin coated material, Terne II boasts improved corrosion-resistance in all environments without compromising its mechanical characteristics. Terne II also has excellent formability, solderability and affinity for paint. It can be used in flatlock, standing seam, vertical wall designs and virtually any other application in which original terne has been used.
The material is strong and ductile – having high yield and tensile strengths, as well as workability – and is easily formed with conventional roofing tools. When used in a roofing application, it is advisable to paint the material with Follansbee Steel's Rapidri® acrylic painting system as soon as conditions permit. Oxide formation is slower than with original terne, so waiting for proper painting conditions provides substantially less risk, Unpainted Terne II achieves 19,250 hours of ASTM B117 Salt Spray accelerated life testing.
Properly maintained, Follansbee's Terne II should last indefinitely. Follansbee Steel provides a 30-year warranty on Terne II installations in non corrosive aggressive environments.
Material Composition, Basic Use and Limitations
Follansbee Terne II is a prime base sheet of drawing-quality carbon steel, coated both sides with ZT® alloy. Terne II can be used for roofs (standing seam, batten seam, flat lock and Bermuda seam), flashing (chimney, base, counter, valley, hip ridge, ledge, dormer, sill, thru wall, termite shield), perimeters, drip edges, mansards, fascia, wall covering and drainage (including all styles of gutters and downspouts).
Limitations: All Terne II surfaces must be painted and drained. When applied on a wood deck:
Note: Do not apply roofing felts under Terne II.
Sheet Widths: 20", 24" and 28"
Sheet Lengths: 96" and 120"
Note: Special sizes available up to 28" W x 144" L
Box of 112 Sheets: 14" x 20" and 20" x 28"
Bundle of 100 Sheets of Flashing: 5" x 7", 7" x 7" and 8" x 7"
Rolls: 50-foot, 100-foot and variable length rolls in widths of 20", 24", 28" and 36"
Coils: 2000 lb. to 4000 lb. mill coils available in widths of 20", 24" and 28"
Gauges and Weights
Gauges: 28 and 30
Weight: (Note: all weights are theoretical and could vary)
Terne II is unique among architectural metals in its affinity for paint. Terne II must be painted using Follansbee Steel's specially formulated Rapidri® acrylic 2-part coating system. The Rapidri primer and finish coats are water-based acrylic coats that can be applied by brush, roller or power spray.
Rapidri® Primer: Follansbee Steel's Rapidri® primer is available in your choice of red or gray.
Rapidri® Finish Coat:
Note: Follansbee Steel's Terne II specification and data manual does not purport to provide information covering all design and application situations, which may confront architects and applicators. In order to safeguard all purchasers' warranty rights, architects and applicators should, in every case, first refer to the most recent details or procedures concerning designs or applications involving Follansbee products, which were published by Follansbee. Additional applications and detail information may be found in the current Architectural Sheet Metal Manual published by Sheet Metal and Air Conditioning Contractors National Association Inc. However, should any conflict arise between any details or procedures published by Follansbee and those published in said SMACNA Manual, the details or procedures published by Follansbee shall take precedence. Failure to comply with any of the conditions set forth herein may void Follansbee Steel's warranty.
Forming: Terne II, a soft metal, forms with conventional hand and regular sheet metal shop tools and can be cut with standard sheet metal hand snips or power tools. For standing seam roofs, preformed ready to apply pans are available in lengths up to 35 feet maximum.
Soldering: Surface needs no pre-tinning. Use only rosin flux and pure tin solder. Use soldering irons only (3 lb. minimum). Correctly heated soldering irons are very important for soldering Terne II. Also, the shop coat must be removed for a good solder joint. Lacquer thinner works best when removing shop coat. Do not use torches or welding equipment.
Underside: On pitched roof area (3" or more per foot), a factory-applied coat or a coat of Rapidri primer must be applied before application. On flat-lock areas (less than 3" per foot), a coat of Rapidri primer must be applied even though a factory-shop coat has been applied.
Exposed Surface: Apply two coats. The mill applied shop coat is not to be considered as one of the two coats required on the exposed surface. First coat is to be Rapidri primer. Allow ample time for each coat to dry completely. Second coat is to be Rapidri in desired color.
IMPORTANT: Again, the mill applied shop coat is not to be considered as one of the two coats required on the exposed surface.
Terne II requires maintenance and must be painted if the finish coat shows wear. In order to meet conditions of the warranty, however, Terne II must be painted with Rapidri® at least once every eight years.
Terne II is coated with Follansbee's ZT® alloy, a combination of zinc and tin. This coating is formulated not only as a barrier but also to be anodic to the steel substrate and reduce the potential for oxidation before painting. Rapidri®, a fast-drying, water-based acrylic painting system, is required. Rapidri consists of primer and finish coats, both of which can be applied by roller, power spray or brush. Under proper weather conditions, Rapidri will dry within 24 hours. This allows for a quicker contractor turnaround, while providing the protection of a spray applied, state-of-the-art acrylic coating. No special treatment of Terne II is necessary prior to painting except that the roof surface should be clean and chalk free.
Because Terne II is easily soldered, it provides weathertight joints around roof perimeters and penetrations. As a result, roofers do not have to rely on sealants, which have a limited life and require maintenance and are assured that these areas of possible water penetration will remain watertight. For soldering, only pure tin solder is recommended. Terne II is an excellent material for restoration projects since it replicates many of the older terne roofs which have served through many decades. Terne II carries a 30-year warranty.
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