Moisture Durability with Vapor-Permeable Insulating Sheathing

Research output: NRELSubcontract Report


Exterior sheathing insulation is an effective strategy in increasing the overall R-value of wall assemblies; other benefits include decreasing the effects of thermal bridging and increasing the moisture durability of the built assembly. Vapor-permeable exterior insulation, such as mineral board or expanded polystyrene foam, are one such product that may be used to achieve these benefits. However,uncertainty exists on the effects of inward driven moisture and the interaction of increased sheathing temperatures on the moisture durability of the edifice. To address these concerns, Building Science Corporation (BSC) conducted a series of hygrothermal models for cities representing a range of different climate zones. This report describes the research project, key research questions, and theprocedures utilized to analyse the problems.
Original languageAmerican English
Number of pages67
StatePublished - 2013

Bibliographical note

Work performed by Building Science Corporation (BSC), Somerville, Massachusetts

NREL Publication Number

  • NREL/SR-5400-58062

Other Report Number

  • DOE/GO-102013-3910


  • Building America
  • Building Science Corporation (BSC)
  • residential
  • residential buildings


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