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building paper[′bil·diŋ ‚pā·pər]
Heavy, waterproof paper used to cover sheathing and subfloors to prevent passage of air and water.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A heavy, waterproof paper usually impregnated with tar and used over sheathing and subfloors to prevent the passage of moisture.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
A heavy, relatively cheap, durable paper, such as asphalt paper, used in building construction, esp. in frame construction, to improve thermal insulation and weather protection and to act as a vapor barrier. Special types are: sheathing paper, used between sheathing and siding; floor lining paper, used between rough and finish floors.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.