in favor of the system. While the results took some time to get published, the test enabled Unit Structures to continue building with glulam. At this time, I-sections featuring plywood webs and glulam flanges became popular in Europe while rectangular sections became the norm in America. The I-sections saved on lumber, which was beneficial to Europeans as they had high lumber costs but were more labor intensive, which was expensive in the States. The glulam system piqued the interest of those on the west coast and many firms began to engage with it. In 1942, the introduction of a fully water-resistant phenol-resorcinol adhesive enabled glulam to be used in exposed exterior environments without concern of glue line degradation, expanding its applicable market. During the midst of World War II, glulam construction became more widespread as steel was needed for the war effort. In 1952, leading fabricators of engineered and solid wood joined forces to create the American Institute of Timber Construction (AITC) to help standardize the industry and promote its use. The first U.S. manufacturing standard for glulam was published by the Department of Commerce in 1963. Since then, glulam manufacturing has spread within the United States and into Canada and has been used for other structures, such as bridges, as well. It is currently standardized under ANSI Standard A190.1. Manufacturing The manufacturing of glulam is typically broken down into four steps: drying and grading the lumber, joining the lumber to form longer laminations, gluing the layers, and finishing and fabrication. The lumber used to produce glulam may come to the manufacturers pre-dried or will have to be dried onsite. A hand-held or on the line moisture meter is used to check the moisture levels of the lumber. Each piece of lumber going into the manufacturing process should have a moisture content between 8% and 14% in accordance with the adhesive used. If a piece of lumber is above this threshold it is redried. Once the lumber is dry, knots on the ends of the lumber are trimmed and grading occurs. Lumber is then grouped based on the grade. To create lengths of glulam longer than those typically available for sawn lumber, the lumber must be end-jointed. The most common joint for this is a finger joint, 1.1 in or 2.8 cm in length cut on either end with special cutter heads. A structural resin, typically RF curing melamine formaldehyde