![]() Plastisol –A coating traditionally used in the siding industry.The pigments enhance the performance of traditional polyesters, but the coatings are still prone to chalking as the resin breaks down over time. Super Polyester – Siliconized polyester with fade-resistant pigmentation.Standard polyester finishes are commonly used on agricultural metal roofs where the price is of greater concern than performance. Silicone additives are used to increase resin stability and coating flexibility. Siliconized Polyester – is a solvent-based system with polyester resin.It is attractive but faces similar problems of streaking, granule loss, and organic growth as traditional composition shingles. Stone Coated – Metal roofing made from zinc or aluminum-coated steel with the same granules as composition shingles.Kynar 500 is produced by Arkema Chemicals, and HSolvay Solexis produce Hylar 5000 Kynar 500 and Hylar 5000 – Registered trade names for polyvinylidene (PVDF) paint finishes that provide very strong longevity and durability, including fade and chalk resistance, that leads the coatings industry.In many cases, this cover creates a trap for debris such as leaves, ice, and snow to gather and clog the valley system, causing water to overflow underneath the roofing system.Ĭoatings – Below are descriptions of the available metal coatings used in the metal roofing industry. This valley carries water in hidden channels beneath the roof covering. These indicate the resistance of a roofing system to fires originating from sources outside the building.Ĭlip – A small metal component used to secure two pieces of metal to each other or to secure metal shingles or standing seam to solid decking.Ĭlosed Valley – A valley with an integral cover over the area where the shingles meet at the miter from adjoining roof planes. and also called “Non-Structural Systems”.” CĬlass A, B, and C Fire Ratings – Fire-resistance ratings were established for roofing per ASTM and UL tests. It is typically made of polyester fleece and infused with tar.Īrchitectural Roofing – A metal roofing system that is non-weight load-bearing and must be installed over solid decking rather than battens or purlins. It has been replaced in many areas by newer synthetic underlayments. 30 lb felt – Formerly the standard underlayment for quality metal roofing systems, and is sit till used.
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