Multifamily Envelope Leakage Model

O. Faakye, D. Griffiths, Wyatt Metzger, Wyatt Metzger

Research output: NRELSubcontract Report


The objective of the 2013 research project was to develop the model for predicting fully guarded test results (FGT), using unguarded test data and specific building features of apartment units. The model developed has a coefficient of determination R2 value of 0.53 with a root mean square error (RMSE) of 0.13. Both statistical metrics indicate that the model is relatively strong. When tested against data that was not included in the development of the model, prediction accuracy was within 19%, which is reasonable given that seasonal differences in blower door measurements can vary by as much as 25%.
Original languageAmerican English
Number of pages33
StatePublished - 2015

Bibliographical note

Work performed by Consortium for Advanced Residential Buildings, Norwalk, Connecticut

NREL Publication Number

  • NREL/SR-5500-62675

Other Report Number

  • DOE/GO-102015-4499


  • blower door testing
  • Building America
  • empirical model
  • envelope leakage
  • guarded
  • multi-linear regression models
  • multifamily apartments
  • predicting fully guarded test results
  • residential
  • residential buildings
  • single-family attached housing
  • unguarded


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