Retrofitting Crawlspaces: Air Sealing and Insulating Crawlspace Subfloors, Free Online Webinar, December 1, 8 am - 12 pm PT

  • 1 December 2022
  • Start time : 08:00 AM
  • End time : 12:00 PM
  • Event Host : PG&E
Air Sealing and Insulating Crawlspace Subfloors, Webinar
Event Description

Testing your work is imperative to meeting or exceeding performance targets and ensuring a feedback loop is in place for continual process improvements. This four-hour class assumes that you have made the decision to align your air and thermal boundary at the subfloor of the crawlspace (rather than at the exterior walls and on grade). For most homes that have a raised floor, this is where the air and thermal boundary is typically located. The way that the subfloor is constructed depends on the era that home was built in.

Instructor Gavin Healy of Balance Point Home Performance will cover the most appropriate air sealing tactics for common subfloor systems built over the last two centuries. Once we have established an effective air barrier, we will cover how to overcome the tendency for subfloor insulation to fail based on gravity and poor installation techniques.


The objective of this course is that at the conclusion, participants will be able to:

  • List two or more penetrations through the crawlspace subfloor that require an air sealing method that can be undone if maintenance is needed
  • Describe to two or more alternatives to batt insulation in the subfloor
  • Explain at least two or more key benefits to air isolating a vented crawlspace from the conditioned spaces
  • Summarize two or more post-retrofit testing strategies for continuity and thermal performance

  • Host Company/Organization Name
    • PG&E
  • Agenda
    • -Introduction and safety message

      -Identifying continuity issues in the crawlspace subfloor air barrier

      -Strategies for air sealing leaks in the subfloor

      -Air sealing around plumbing fixtures that may require future maintenance

      -Removing abandoned or soon-to-be abandoned mechanical equipment that interfaces with the subfloor air barrier

      -Air sealing electrical systems and conduits that pass through the subfloor

      -Addressing air leakage at masonry fireplaces that pass though the subfloor

      -Addressing continuity issues with the subfloor air barrier and HVAC systems

      -Connecting the subfloor air barrier to the exterior wall air barrier
  • Speakers / Presenters
    • Gavin Healy

      In 2006, Gavin Healy co-founded (with Dan Perunko) Balance Point Home Performance a full service home performance analysis, retrofit, consulting, and training company. Gavin works on new construction design and hands on installation of enclosure, mechanical, plumbing, and indoor air quality components based on testable performance outcomes.
  • Cost
    • FREE Event
  • Event type
    • Online/Webinar

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