Moisture Sources / Jeffrey E. Christian.

Format:

Book

Author/Creator:

Christian, Jeffrey E., author.

Contributor:

American Society for Testing and Materials.

ASTM International.

Series:

Journal of ASTM International. Manual Series ; MNL11547M.

ASTM manual series ; MNL11547M

Language:

English

Subjects (All):

Dampness in buildings--Prevention.

Dampness in buildings.

Waterproofing.

Physical Description:

1 online resource (7 pages) : illustrations, figures, tables.

Volume 2009, Issue 18 (January 2009)

Other Title:

ASTM digital library.

Place of Publication:

West Conshohocken, Pa. : ASTM International, 2009.

System Details:

Mode of access: World Wide Web.

text file PDF

Summary:

TO UNDERSTAND MOISTURE PROBLEMS IN BUILDings, one must correctly determine the moisture sources. This chapter discusses the major sources of moisture in buildings, the rates associated with those sources, and frequencies of moisture dissipation. Several key equations are presented to estimate moisture sources for unique site-specific conditions. Excessive moisture within buildings can cause mold, mildew, and potentially damaging concealed condensation which, in time, distresses the building envelope's thermal and structural performance. Interior moisture sources are more important in colder climates, with more than 2,222 heat degree days (HDD) base 18.8C (4,000 HDD base 65F) and an average January temperature below 4.4C (40F) where the relative humidity within the building could be 45%[1]. In the summer, moist outside air is the more important moisture source. Moist air from the outside is generally an important moisture source of concern in regions meeting the ASHRAE definition of a humid climate [2]. A humid climate is defined as one in which one or both of the following conditions occur: 1. A 19.5C (67F) or higher wet-bulb temperature for 3,500 h or more during the warmest six consecutive months of the year. 2. A 23C (73F) or higher wet-bulb temperature for 1,750 h or more during the warmest six consecutive months of the year.

Notes:

"ASTM Stock Number: MNL11547M".

Includes bibliographical references 29.

Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2009. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.

Description based on publisher's website, viewed May 03, 2017.

ISBN:

9780803184008 (e-ISBN)

9780803170049

Access Restriction:

Restricted for use by site license.