Moisture Transport in a Metal Building Roof Insulation System PDF Download
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Author: DS. Musgrave
Publisher:
ISBN:
Category : Condensation
Languages : en
Pages : 11
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Book Description
Metal buildings generally are constructed with no ventilation between the metal roof sheet and the roof insulation. This situation may result in moisture accumulation in the insulation, if the insulation does not have a satisfactory vapor barrier. The insulation vapor barrier performance is not only a function of the vapor barrier material, but also a function of the vapor barrier seams and any components which must penetrate the vapor barrier. An experimental investigation of a metal building roof insulation system was conducted. The system consisted of faced insulation boards suspended below the purlins with light density insulation installed between the board and the roof sheet. A large scale moisture test facility was used. A 2.44 by 3.67 m (8 by 12 ft) roof test specimen was constructed using actual metal building construction procedures and materials. The interior side of the test specimen was maintained at 21.1°C (70°F) and 50 percent relative humidity, while the temperature above the roof sheet was held below -23.3°C (-10°F). In order to determine the temperature and humidity conditions within the roof plenum, the test specimen was instrumented with thermocouples and humidity gages. The test duration was 3 weeks, after which the test specimen was disassembled for visual observations of the interior portion of the roof section and to obtain specimen weights of the insulation. No significant moisture accumulated in the insulation or the roof cavity.
Author: DS. Musgrave
Publisher:
ISBN:
Category : Condensation
Languages : en
Pages : 11
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Book Description
Metal buildings generally are constructed with no ventilation between the metal roof sheet and the roof insulation. This situation may result in moisture accumulation in the insulation, if the insulation does not have a satisfactory vapor barrier. The insulation vapor barrier performance is not only a function of the vapor barrier material, but also a function of the vapor barrier seams and any components which must penetrate the vapor barrier. An experimental investigation of a metal building roof insulation system was conducted. The system consisted of faced insulation boards suspended below the purlins with light density insulation installed between the board and the roof sheet. A large scale moisture test facility was used. A 2.44 by 3.67 m (8 by 12 ft) roof test specimen was constructed using actual metal building construction procedures and materials. The interior side of the test specimen was maintained at 21.1°C (70°F) and 50 percent relative humidity, while the temperature above the roof sheet was held below -23.3°C (-10°F). In order to determine the temperature and humidity conditions within the roof plenum, the test specimen was instrumented with thermocouples and humidity gages. The test duration was 3 weeks, after which the test specimen was disassembled for visual observations of the interior portion of the roof section and to obtain specimen weights of the insulation. No significant moisture accumulated in the insulation or the roof cavity.
Author: M. Lieff
Publisher: ASTM International
ISBN: 9780803106055
Category : Technology & Engineering
Languages : en
Pages : 296
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Book Description
Author: J. Paul Guyer, P.E., R.A.
Publisher: Guyer Partners
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 79
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Book Description
Introductory technical guidance for civil engineers, architectural engineers, structural engineers and construction managers interested in design and construction of metal buildings and exterior insulation and roofing systems. Here is what is discussed: 1. METAL BUILDING SYSTEMS 2. EXTERIOR INSULATION FINISH SYSTEMS (EIFS) 3. ROOFING SYSTEMS 4. GLOSSARY.
Author: Heinz R. Trechsel
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 494
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Book Description
Author: Institute of Medicine
Publisher: National Academies Press
ISBN: 0309091934
Category : Science
Languages : en
Pages : 369
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Book Description
Almost all homes, apartments, and commercial buildings will experience leaks, flooding, or other forms of excessive indoor dampness at some point. Not only is excessive dampness a health problem by itself, it also contributes to several other potentially problematic types of situations. Molds and other microbial agents favor damp indoor environments, and excess moisture may initiate the release of chemical emissions from damaged building materials and furnishings. This new book from the Institute of Medicine examines the health impact of exposures resulting from damp indoor environments and offers recommendations for public health interventions. Damp Indoor Spaces and Health covers a broad range of topics. The book not only examines the relationship between damp or moldy indoor environments and adverse health outcomes but also discusses how and where buildings get wet, how dampness influences microbial growth and chemical emissions, ways to prevent and remediate dampness, and elements of a public health response to the issues. A comprehensive literature review finds sufficient evidence of an association between damp indoor environments and some upper respiratory tract symptoms, coughing, wheezing, and asthma symptoms in sensitized persons. This important book will be of interest to a wide-ranging audience of science, health, engineering, and building professionals, government officials, and members of the public.
Author: Lawrence I. Knab
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 62
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Book Description
Author: Heinz R. Trechsel
Publisher: ASTM International
ISBN: 0803112548
Category : Building materials
Languages : en
Pages : 172
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Book Description
Author: American Society of Heating, Refrigerating and Air-Conditioning Engineers
Publisher:
ISBN: 9781939200426
Category : Air conditioning
Languages : en
Pages : 0
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Book Description
Moisture control is fundamental to the proper functioning of any building. Controlling moisture is important to protect occupants from adverse health effects and to protect the building, its mechanical systems and its contents from physical or chemical damage. Yet, moisture problems are so common in buildings, many people consider them inevitable. Excessive moisture accumulation plagues buildings throughout the United States, from tropical Hawaii to arctic Alaska and from the hot, humid Gulf Coast to the hot, dry Sonoran Desert. Between 1994 and 1998, the U.S. Environmental Protection Agency (EPA) Building Assessment Survey and Evaluation (BASE) study collected information about the indoor air quality of 100 randomly selected public and private office buildings in the 10 U.S. climatic regions.
Author: Andrew K. Persily
Publisher:
ISBN:
Category : Office buildings
Languages : en
Pages : 102
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Book Description
Office building envelopes are generally successful in meeting a range of structural, aesthetic and thermal requirements. However, poor thermal envelope performance will occur when there are discontinuities in the envelope insulation and air barrier systems, such as thermal bridges and air leakage sites. These discontinuities result from designs that do not adequately account for heat, air and moisture transmission, with many thermal defects being associated with inappropriate or inadequate detailing of the connections of envelope components. Despite the existence of these thermal envelope performance problems, information is available to design and construct envelopes that do perform well. In order to close the gap between available knowledge and current practice, the Public Buildings Service of the General Services Administration has entered into an interagency agreement with the Center for Building Technology of the National Institute of Standards and Technology to develop thermal envelope design guidelines for federal office buildings. The goal of this project is to transfer the knowledge on thermal envelope design and performance from the building research, design and construction communities into a form that will be used by building design professionals. This report describes the NIST/GSA envelope design guidelines development at the end of the first year of effort on the project. The effort to this point has consisted of a literature review of research results and technical information on thermal envelope performance and design, an assessment of existing design guidelines as they relate to the thermal envelope, and the development of a format and outline for the design guidelines.
Author: GP. Bal
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 20
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Book Description
The transport of heat and moisture has been investigated in a mediumdensity wetted insulation. Experimental and analytical investigations were made on samples up to 50 mm thick with fixed average moisture concentrations. Moisture and temperature distributions were measured under transient and steady conditions.
