Title: Moisture-related properties of wood and the effects of moisture on wood and wood products
Author: Carll, Charles; Wiedenhoeft, Alex C.
Source: Moisture control in buildings : the key factor in mold prevention, chapter 4. 2nd ed. West Conshohocken, PA : ASTM International, c2009: p. 54-79: ISBN: 9780803170049: 0803170041.
Description: The central topic of this chapter is how moisture affects the properties and behaviors of wood and wood-based products used in building construction. Physical properties and behaviors are discussed, as are structural behaviors, and what may be considered biological behaviors (specifically, the likelihood of biological infestation by microbes and insects). The order of discussion is that outlined in the previous sentence, namely physical first, then structural, then biological. Before the chapter delves into its central topic, it provides background information on wood and on adhered (bonded) wood products. The information presented on wood includes discussion of wood structure, composition and basic characteristics, with an emphasis on structure. The information presented on bonded wood products follows a similar discussion path, but inasmuch as these are manufactured products, the emphasis is on product classification, composition, fabrication, and characteristics. Information concerning contemporary wood products is presented, as is information on wood products produced in past decades. The intent is to provide information applicable to buildings of various ages, not just to recently-constructed buildings. The chapter also presents recommendations and guidelines for in-service moisture content. The recommendations are reiterated values from the literature, and take the form of not-to-exceed values. The recommendations are applicable to prevention of biological infestation; there is evidence that these recommended values also roughly correspond with values that have structural performance implications, irrespective of biological infestation. The guidelines, in contrast to the recommendations, relate to limitation of fluctuation in moisture content. The guidelines provide a basis that allows the reader to develop their own project-specific limitations on moisture fluctuation.
Keywords: Wood moisture, moisture content, deterioration, moisture, building materials, service life, lumber, fasteners, corrosion, biodegradation, wood-decaying fungi, bacteria, insect pests, wood anatomy, composite materials, mechanical properties, building moisture, wooden buildings, dimensional stability, moisture control, exposure tests, decomposition of wood, durability, swelling, warping, checking, shrinkage, creep, connectors, wood strength, wood decay, moisture content of wood in service
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Carll, Charles; Wiedenhoeft, Alex C. 2009. Moisture-related properties of wood and the effects of moisture on wood and wood products. In: Moisture control in buildings: The key factor in mold prevention. 2d ed. West Conshohocken, PA: ASTM International, c2009. H. R. Treschel and M. T. Bomberg, eds. Chapter 4: 54-79. ISBN: 9780803170049: 0803170041.
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