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Title: Investigating Solutions to Wind Washing Issues in Two-Story Florida Homes, Phase 2

With U.S. Department of Energy goals of reducing existing home energy use by 30% and new home energy use by 50%, it is imperative to focus on several energy efficiency measures, including the quality of air and thermal barriers. This report provides results from a second-phase research study of a phenomenon generally referred to as wind washing. Wind washing is the movement of unconditioned air around or through building thermal barriers in such a way as to diminish or nullify the intended thermal performance. In some cases, thermal and air barriers are installed very poorly or not at all, and air can readily move from unconditioned attic spaces into quasi-conditioned interstitial spaces. This study focused on the impact of poorly sealed and insulated floor cavities adjacent to attic spaces in Florida homes. In these cases, unconditioned attic air can be transferred into floor cavities through pathways driven by natural factors such as wind, or by thermal differences between the floor cavity and the attic. Air can also be driven into a floor cavity through mechanical forces imposed by return duct leakage in the floor cavity.
 [1] ;  [1]
  1. Florida Solar Energy Center, Cocoa, FL (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
NREL/SR-5500-63427; DOE/GO-102015-4595
DOE Contract Number:
AC36-08GO28308; KNDJ-0-40340-04
Resource Type:
Technical Report
Resource Relation:
Related Information: Work performed by Building America Partnership for Improved Residential Construction (BA-PIRC), Cocoa, Florida
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
Country of Publication:
United States
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; residential; residential buildings; BA-PIRC; building america; wind washing; floor cavity; attic space; thermal barrier; air barrier; uncontrolled infiltration; duct tightness; pressure testing; retrofit; existing homes; cooling impacts; heating impacts; multi-story