However, when the mechanical uplift resistance force determined by Procedure A is less than the calculated uplift force, Procedure B can be utilized. Small variations in exposure beyond manufacturer tolerances significantly can affect a shingle's actual wind performance. The appearance of a company's name or product in this database does not in itself assure that products so identified have been manufactured under UL's Follow-Up Service. The uplift-resistance value is compared with the shingle's uplift-force value derived from UL ; a safety factor is added; and the appropriateness of a specific asphalt shingle for a specific wind speed is determined. Also, when considering UL-classified products, it is important to realize UL's classifications only apply to specific products manufactured in specific manufacturing facilities. With the new wind-resistance methodology, proper asphalt shingle alignment, coursing and exposure are critical. The new wind-resistance methodology's implementation in the U. For instance, the methodology applies only to asphalt strip shingles with sealant whether the sealant is factory-applied or field-applied hand-tabbed.
termined and classified based on one of two similar test methods: UL“Stan- dard for Wind Resistance of Prepared.
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Roof Covering Materials,” and ASTM. Find the most up-to-date version of UL at Engineering design wind speed as defined by local authority or ASCE 7 equals.
mph or forwarded for UL evaluations at UL's Northbrook test facility.
Selecting shingles for wind resistance Professional Roofing magazine
Always look for the Mark on the product. An asphalt shingle's pressure coefficients are then multiplied by the areas, and an uplift force load on the asphalt shingle tab is determined. About Cookies. Small variations in exposure beyond manufacturer tolerances significantly can affect a shingle's actual wind performance.
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If you use asphalt shingle products classified according to the new methodology, carefully select appropriate products and beware of the considerations that apply to the methodology and product classifications. The specific manufacturers and products that have been tested, classified and included in UL's labeling and follow-up service programs are identified in Figure 2.
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Ul 997 wind rating
|Also, the only thing UL provides to verify the applicability of a UL classification to a specific product is the appearance of the UL listing mark on the product's packaging.
During the s, building code officials and the insurance industry called for wind resistances at even higher levels for all roof systems, including asphalt shingle roof systems.
In order to be eligible for certification under this category, asphalt shingles must also be certified under Prepared Roof-covering Materials TFWZ. Wind resistance is an important performance property of asphalt shingle products and, depending on region, may be a significant consideration for building owners.
Until the mid- to lates, this level of wind resistance generally was considered adequate for asphalt shingle products and most product warranties were based on this level of wind performance. Currently, only a limited number of asphalt shingle products have been tested and are classified according to this new methodology.
ga. alum-zinc galvanized steel with advanced double sided coatings U.L. Class A UL rated wind proof, warrantied to mph, leak-proof in wind- driven.
Shingles classified by a new wind-resistance methodology require careful methods: UL"Standard for Wind Resistance of Prepared Roof.
The statement "Reprinted from the Online Certifications Directory with permission from UL" must appear adjacent to the extracted material.
As a result, asphalt shingles that pass the fan-induced wind test at 60 mph are designated as Class A; those that pass the test at 90 mph are designated as Class D; and those that pass the test at mph are designated as Class F. Specifically, UL Category Code TFWZ, "Prepared Roof Covering Products," identifies asphalt shingle manufacturers and specific products that have been tested, classified and included in UL's labeling and follow-up service programs, ensuring ongoing compliance with the test methodology.
In some instances, an asphalt shingle product produced in one manufacturing facility will be classified but a product from the same manufacturer and of the same product name produced in a different manufacturing facility may not be similarly classified. UL Product Spec. As a result, the new methodology does not apply when a building is taller than 60 feet; has an Exposure Category D flat, unobstructed areas ; or Building Use Categories III schools, health care facilities, jails or IV essential facilities.
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|Specifically, UL Category Code TFWZ, "Prepared Roof Covering Products," identifies asphalt shingle manufacturers and specific products that have been tested, classified and included in UL's labeling and follow-up service programs, ensuring ongoing compliance with the test methodology.
With the new wind-resistance methodology, proper asphalt shingle alignment, coursing and exposure are critical.
Procedure A measures the uplift resistance to a force applied in a peeling action simulating the front-edge lifting mechanism. Refer to the most current ASCE 7 document for more information regarding these factors. The greater number of manufacturers and products listed in UL's certifications directory compared with NRCA 's materials guide indicates manufacturers' recent testing, certification and implementation of the new wind-resistance methodology.