Why Good Sheathing Makes or Breaks a Passive House
By Graham Mann | Published: 11/25/2025
Learn how quality sheathing impacts a passive house's energy efficiency, moisture control, and structural integrity.
Why Good Sheathing Makes or Breaks a Passive House In passive house construction, sheathing is critical for energy efficiency, moisture control, and structural durability. It forms a continuous air barrier, prevents heat loss, and manages moisture to avoid issues like mold or rot. Without the right material and precise installation, even top-tier insulation fails to perform. Key Takeaways: - Airtightness: Passive houses require airtightness of 0.6 ACH50. Properly installed sheathing ensures minimal air leakage. - Moisture Management: Sheathing must repel water while allowing vapor to escape, preventing condensation and structural damage. - Material Selection: Options like OSB, plywood, fiberboard, or MgO panels offer varying strengths, vapor permeability, and thermal performance. - Installation Precision: Seam sealing and joint integrity are vital for airtightness and long-term durability. Choosing and installing the right sheathing is the backbone of a passive house's success. It dire...
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