Copyright Goodheart-Willcox Co., Inc. Unit 7 Construction Materials—Types and Uses 113 • Sand-lime brick. Made from a mixture of sand and lime, molded into shape and hardened under steam pressure and heat. • Concrete brick. Made from a mixture of Portland cement and aggregates, molded into solid or cored units and hardened chemically by the hydration of cement. There are many types and sizes of brick. Most brick is either building brick or face brick. Some special types are used to a lesser extent. • Building brick. Usually called “common brick,” this is the most commonly used type. It is used for interior and exterior walls, backing, and other applications where appearance is not important. • Face brick. This material is manufactured under more controlled conditions to produce bricks of specific dimensions, colors, and structural qualities. Face bricks are more expensive than building bricks, because of the care going into their manufacture. Face bricks with defects are often sold as common bricks. • Glazed brick. Finished with a hard, smooth coating, this type of brick is used for decorative and special service applications. • Firebrick. Used where masonry units are subjected to extreme heat, such as fireplaces, incinerators, and industrial furnaces. • Paving brick. Used in driveways or areas where abrasion is a concern. Brick Masonry Brick masonry uses units (bricks) that are manufac- tured, rather than removed from quarries. There are many types: • Adobe brick. Made from natural sun-dried clays or earth and a binder. • Kiln-burned brick. Made from natural clays or shales (sometimes with other materials added, such as coloring) and molded to shape, dried, and fired for hardness. Common Stock Styles of Welded Wire Fabric Style Designation Steel Area (in²/ft) Weight (lb/100 ft²) New designation (by W-number) Old designation (by steel wire gage) Longit. Trans. Roll 6×6–W1.4×W1.4 × 4 × 6×6–W2.0×W2.0 × 0 × 6×6–W2.9×W2.9 × 9 × 6×6–W4.0×W4.0 × 0 × 4×4–W1.4×W1.4 × × × 4 × 4×4–W2.0×W2.0 × × × 0 × 4×4–W2.9×W2.9 × × × 9 × 4×4–W4.0×W4.0 × × × 0 × 6×6–10×10 6– 6×6–8×8* 6– 6×6–6×6 6– 6×6–4×4 6– × × 4×4–10×10 4– × × 4×4–8×8* 4– × × 4×4–6×6 4– × × 4×4–4×4 4– × × × × .028 .040 .058 .080 .042 .060 .087 .120 .028 .040 .058 .080 .042 .060 .087 .120 21 29 42 58 31 43 62 85 Sheets 6×6–W2.9×W2.9 × 9 × 6×6–W4.0×W4.0 × 0 × 6×6–W5.5×W5.5 × 5 × 4×4–W4.0×W4.0 × × × 0 × 6×6–6×6 6– 6×6–4×4 6– × × 6×6–2×2** 6– 4×4–4×4 4– × × × × .058 .080 .110 .120 .058 .080 .110 .120 42 58 80 85 *Exact W-number size for 8 gage is W2.1 **Exact W-number size for 2 gage is W5.4 Wire Reinforcement Institute Figure 7-8. Welded wire fabric is available in a number of stock sizes, in either roll or sheet form. PhotoByToR/Shutterstock.com Figure 7-9. Wire mesh in a concrete slab.