Determining the adventitious leakage of buildings at low pressure. Part 1: Uncertainties

E. W. Cooper, David W. Etheridge

Research output: Journal PublicationArticlepeer-review

16 Citations (Scopus)


Part 1 of this paper examines the uncertainties (errors) inherent in the determination of the low-pressure leakage of a building envelope. Current procedures use high-pressure data (typically 50 Pa) as a measure of the infiltration potential of an envelope. In reality, infiltration occurs at much lower pressures (typically 4 Pa). As a consequence, large uncertainties are inherent in the current procedures. It is shown that a technique for direct measurement of Q4 could reduce the uncertainty by a factor of three or more. One of the keys to such a measurement is to consecutively measure Δp with and without an imposed flow in a short time. In Part 2 of this paper, a technique is described that enables such measurements to be made. Practical application: The paper describes how estimates can be made of the uncertainty in the low-pressure leakage of a building envelope obtained from conventional leakage measurements at high pressures.

Original languageEnglish
Pages (from-to)71-80
Number of pages10
JournalBuilding Services Engineering Research and Technology
Issue number1
Publication statusPublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • Building and Construction


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