Today, the three-legged stool breaks down and digests the recent podcast about insulation with Patrick Huelman.

Tessa starts the discussion by talking about Patrick's applied research and development in residential houses with the Building America Program that is led by the Department of Energy. This program focuses on energy efficiency and building performance issues, (durability, quality, affordability, comfortability, and indoor air issues) by upgrading the insulation in exterior walls. She shares the nationwide data about homes that could benefit from this project and the type of homes this can be applied to. They also talk about insulation R-values.

Reuben highlights that identifying the best method to retrofit an uninsulated wall depends on the type of the house, the design, materials, climate, and water management strategy, among others. He discusses the drill-and-fill method which he thinks is the best method. He also discusses other methods and the possible return on investment on energy costs. Bill asks why the concept of the perfect wall is not a priority among homeowners. He also asks about the best value-for-money method.

As a takeaway from the session, Tessa shares that the order of changes and improvements in the house matters. She adds that before focusing on energy efficiency, interior issues should be addressed.

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