#683: Barndominiums, ERVs, and Radon Mitigation

When building a barndominium, carefully consider whether conventional stick-framing with a large truss roof might offer better insulation and air-sealing benefits than a post-frame structure, especially for residential areas.

Radiant slab cooling systems require extremely tight humidity control to prevent condensation; a hybrid system with forced-air cooling or separate hydronic panels might be a more reliable option, particularly in climates with large temperature swings.

For radon mitigation in slab-on-grade homes, test the site for radon levels before construction to design an appropriate system; a sub-slab depressurization system with suction points and proper sealing is a common solution.

All new homes, even those not considered 'extremely tight,' benefit significantly from dedicated ventilation systems like ERVs or HRVs to ensure good indoor air quality and manage CO2 levels.

When planning for ERV/HRV ductwork in homes without basements or conditioned attics, consider options like plenum trusses for dedicated chases, building soffits, or strategically burying insulated flexible ducts within attic insulation (adhering to code requirements for insulation depth).

Indoor air quality is paramount; beyond fresh air, effective filtration (e.g., Merv 13 filters) is crucial, especially in homes relying solely on mini-splits or hydronic systems without central ductwork. Consider what materials and activities contribute to indoor air pollution.