Information on Section 1: Asphalt Shingles General Information Section 1: Asphalt Shingles in the2000 edition of NRCA’s Steep-Slope Roofing Materials Guide provides a comprehensive listing of asphalt shingle products commonly used in steep-slope roofing. Asphalt shingle products are composed of (1) a base material, either organic felt or glass fiber mat, that provides support for the weather resistant components and gives the shingle strength; (2) asphalt; and (3) surfacing material, generally in the form of mineral granules, that provides protection from impact and ultraviolet degradation and improves fire resistance. Asphalt shingles are categorized in different ways, depending on their reinforcement and shape. Asphalt shingles that use an organic reinforcing mat are referred to as organic-reinforced asphalt shingles, and those that use a glass fiber-reinforcing mat are referred to as glass fiber-reinforced asphalt shingles. The appearance and shape of an asphalt shingle are generally identified as follows: Strip Shingles -- These shingles are in a strip form and are the most common type of asphalt shingles produced. They generally are longer in width than height. Common dimensions for standard shingles are 12 inches (300 mm) by 36 inches (910 mm). For metric-sized shingles, the common dimensions are approximately 13-1/4 inches (335 mm) by 39-3/8 inches (1 m). These dimensions can vary depending on the manufacturer, and some newer products are available in larger dimensions than traditional standard- or metric-sized asphalt strip shingles. Products referred to as 3-tab, 4-tab, random tab and no cut-out shingles are all generally categorized as strip shingles. Most strip shingles are “self-sealing”; that is, they contain an adhesive seal strip that bonds to the overlying course of shingles for increased wind resistance. Laminated strip shingles -- Sometimes called “dimensional” or “architectural” shingles, these shingles have additional material laminated to the strip to create random thicknesses thereby giving the shingles a more dimensional look. Most laminated shingles are “selfsealing”; that is, they contain an adhesive seal strip that bonds to the overlying course of shingles for increased wind resistance. Dimensions can vary depending on the manufacturer, and some newer products are available in larger dimensions than traditional standard- or metric-sized asphalt strip shingles. Individual Shingles -- Individual shingles are typically smaller than strip shingles, and more pieces are required to cover the same roof area than with strip shingles. Particularly in the past, individual shingles were known for their unique visual patterns. Scalloped, 17 fish scale, diagonal, diamond, and octagon are a few of the different patterns which can be achieved with individual shingles depending on their design, and some of these products are still available. Some of the individual shingles offer a locking feature to provide for increased wind resistance, since individual shingles typically do not contain self-sealing adhesive strips. The “T-Lock” design is an example of this locking type feature. Specific Information Included in the Guide Information on asphalt shingle products is presented in the guide in three parts: Part 1: General Information, Part 2: Technical Data and Part 3: Asphalt Shingle Warranties. Specific information included in Part 1: General Information is as follows: 1. Company name 2. Product name 3. Product description 4. Shingle type 5. Availability 6. Dimensions and coverage 7. Hip/ridge shingle available 8. Slope/underlayment requirements 9. Recommended deck material 10. Year product first sold 11. Number of squares installed 12. Manufacturers plant locations 13. Distribution 14. Sales and technical information contacts In Part 2: Technical Data, specific listing information is as follows: 1. Company name 2. Product name 3. Product description 4. Complies with (ASTM standards) 5. Masses of asphalt shingles 6. Physical requirements 7. Fire/wind/impact resistance 8. Code acceptance Reporting of technical data in Items 5 and 6 is based on the following American Society for Testing and Materials (ASTM) standards: • ASTM D225, titled “Standard Specification for Asphalt Shingles (Organic Felt) Surfaced With Mineral Granules” • ASTM D3462, titled “Standard Specification for Asphalt Shingles Made from Glass Felt and Surfaced with Mineral Granules”. Additional information regarding asphalt shingle roof systems is provided in The NRCA Steep Roofing Manual and The NRCA Roofing and Waterproofing Manual.