Attic or Roof? An Evaluation of Two Advanced Weatherization Packages

Research output: NRELSubcontract Report


This project examines implementation of advanced retrofit measures in the context of a large-scale weatherization program and the archetypal Chicago brick bungalow. One strategy applies best practice air sealing methods and a standard insulation method to the attic floor. The other strategy creates an unvented roof assembly using materials and methods typically available to weatherizationcontractors. Through implementations of the retrofit strategies in a total of eight (8) test homes, the research found that the two different strategies achieve similar reductions in air leakage measurement (55%) and predicted energy performance (18%) relative to the pre-retrofit conditions.
Original languageAmerican English
Number of pages64
StatePublished - 2012

Bibliographical note

Work performed by Building Science Corporation, Sommerville, Massachusettes

NREL Publication Number

  • NREL/SR-5500-53851

Other Report Number

  • DOE/GO-102012-3504


  • attics
  • BSC
  • Building Science Corporation
  • CEDA weatherization program
  • retrofit
  • roofs


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