Case Studies

Project: Custom Residence – Southeast U.S.

Client: Confidential

Services Provided

LBFG provided both architectural and mechanical building forensics services that accurately diagnosed the cause of the condensation/frost formation and properly identified deficiencies in the HVAC design contributing to the problem. LBFG’s services included providing an expert report and arbitration testimony to assist in resolving the dispute.

Case Summary

A two-story custom home in the Southeast constructed around 2013 with custom steel-framed windows was experiencing excessive condensation and frost formation on the interior of the window frames; however, not all of the steel-framed windows experienced the problem. The windows that exhibited the condensa­tion/frost formation were located in rooms with a bay window configuration in which the windows were located away from HVAC supply diffusers. Similar windows in other areas of the house that had HVAC supply diffusers in closer proximity to the windows did not show signs of condensation/frost. LBFG determined that the conductive properties of the steel-framed windows in conjunction with a lack of sufficient warm air flow from the HVAC system resulted in condensation and frost formation at the bay window locations. LBFG identified specific HVAC industry design guidelines published by ASHRAE that had not been adequately implemented, which would have reduced the probability of condensation and frost formation.

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