Board Insulation Below Grade: Foam, Polyiso, and Mineral Wool

In part two of their insulation series on the Build Show podcast, Matt Risinger, Founder, The Build Show and Travis Brungardt dig into board insulation, with a focus on basements and foundations. They compare rigid foam, polyiso, and mineral wool boards, covering water management, vapor-open assemblies, and thermal continuity. The conversation weighs interior against exterior placement below grade, including pest pressure, inspection access, and drainage. They also cover insulating slabs, offsetting joints in multiple layers, and how compressibility and labor affect installation. Durability and moisture control come up throughout, tied to the BUILD HD standard.

Explore the Builder's Insulation Playbook Series and discover valuable insights, techniques, and best practices for better insulation and better building. Watch the full series here: https://buildshownetwork.com/bsn-series/builders-insulation-playbook

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