ملاحضات گارانتی شینگل
Roof designers often incorrectly give considerable weight to a manufacturer’s warranty when considering a roof system and a specific manufacturer. Many limitations are associated with most warranties. The warranty itself should not be the basis for selecting a system or a manufacturer.
Warranties do not stop or protect against leaks. They do not entitle a building owner to a replacement roof if there are manufacturing defects in materials. They do not provide for proactive replacement if a roof is clearly failing and degrading but still not leaking. They do not cover any consequential damages to other building components or contents of the building. They do not provide any coverage for lost time or productivity resulting from a leak. Furthermore, they do not ensure that damage caused by hail or wind, or another type of damage will not occur. Rather, a warranty most typically provides for limited repairs of the roof membrane only after a leak occurs. Legally, a warranty defines specific rights and obligations of the building owner and warrantor. It includes remedies and exclusions. If the warrantor is out of business when a problem covered by the warranty is experienced, the warranty often becomes a useless piece of paper.
Since the 1970s, many warranties have become marketing tools rather than true reflections of demonstrated roof system performance. It is common to see 20-year warranties on roof systems that have only been in the marketplace for a few years. When architects rely on warranties for performance, rather than paying attention to the factors that actually affect performance; the potential for premature failure dramatically increases.
When warranties are specified, the specification typically requires the warranty to be issued by the roof membrane manufacturer. It is recommended to specify that the warranty include both the roof membrane materials, other roof system components such as roof insulation, vapor retarders if used, fasteners, adhesives, flashings, and accessories. The warranty should cover the roofing contractor’s workmanship. Material-only warranties are also available from manufacturers. In fact, it is nearly impossible to buy roofing membranes without at least a materials only warranty. However, these warranties are nearly useless. A manufacturer’s warranty establishes a direct contractual relationship between the building owner and manufacturer. For low-slope systems, the length of coverage for a manufacturer’s warranty is typically 5 to 25 years, with 10 years being the most common.
Warranties will be prorated in value unless they are clearly specified as a NO DOLLAR LIMIT (NDL) warranty. Prorated warranties provide very limited coverage in the later years of the warranty period just when the warranty coverage is most needed.
When involved with landscaped roofs, consider warranties that cover the cost of removing and replacing the overburden of the landscaping to access the roof. Reliable, hot-applied rubberized asphalt membrane roofing manufacturers will provide these.