03/27/2024
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Building Science Mistake to Avoid: Failing to condition crawlspaces, basements, and attics
"Beyond being aware of a foundation’s structural importance and thinking of an attic as extra storage, crawlspaces, basements, and attics are often overlooked. But these spaces affect both the health of the home and that of its occupants.
Crawlspaces, basements, and attics need to be conditioned like the rest of the home to prevent moisture issues, to forestall heating and cooling losses to the outside, and to reduce exposure to contaminants.
Spaces that are finished or that house mechanical equipment need to be insulated and conditioned for comfort, to prevent moisture issues, and for the mechanical equipment to perform efficiently as designed. And even if crawlspaces, basements, or attics don’t contain any equipment at all, they need to be insulated, air-sealed, and conditioned to prevent damage to the structure and adverse effects on occupant health.
Foundations in particular must be sealed from ground moisture and soil gasses. Because insulated crawlspaces, basements, and attics are within the thermal boundary of the house, they must be considered when planning HVAC+D systems. Depending on your climate zone or location in the country, conditioning these spaces may include the need for additional heating, cooling, or dehumidification as part of the primary HVAC system, or independent systems that depend on the use or needs for each space." - Emily Mottram, Mottram Architecture, Thomaston, Maine.
Read more building science mistakes to avoid from FHB contributors: https://www.finehomebuilding.com/2024/03/06/9-more-building-science-mistakes-to-avoid
Drawing by Peter Wojcieszek