Copyright Goodheart-Willcox Co., Inc. Unit 7 Construction Materials—Types and Uses 123 Glue-Laminated Timber The process of laminating (bonding layers of lumber g together with adhesive) has made it possible to span larger distances and change traditional construction techniques. Wood beams, arches, and other members of nearly any size and shape can be fabricated. These laminated products are made of kiln-dried lumber and prepared for interior and exterior use. These members are usually prefinished at the factory and delivered to the job with protective wrapping. Division 09—Finishes Finishes are the visible surfaces of a building, such as gypsum wallboard, paint or wallpaper, ceramic tile, carpeting, wood flooring, and acoustical ceilings. Finishes are, in part, delineated on the drawings and specified in a room finish schedule. usually 4′ × 8′ in size, and are available in finished thicknesses ranging from 1/8″ to over 1″. ″ Because of its ″ modular size and uniformity, plywood speeds construc- tion and is considered an economical building material. Interior plywood is bonded with an adhesive that is water-resistant. It is used for cabinetry, rough flooring, and finished walls. Exterior or structural plywood is bonded with a waterproof adhesive. It is used for wall sheathing, finished walls, roof sheathing, and concrete forms. Goodheart-Willcox Publisher Figure 7-21. Open-web steel joists combine strength with light weight. Goodheart-Willcox Publisher Figure 7-22. Wood continues to be the primary building material for residences and for many larger structures, such as this low-rise hotel. Reducing Lumber Waste Pre ec ut, custo t om , and fabricated components can n be e cut to t o specification at the lumber be milll and d shipped h d to the job site. This reduc u ce s job b site e wa as te du d ue to material misuse, poor oo stora ag e e, car rp enter n err ro r, and other mishaps. GREEN BUILDING