Designs That Work
Mixed-Humid Climate
A mixed-humid climate is defined as a region that receives more than 20
inches of annual precipitation, has approximately 5,400 heating degree
days or fewer, and where the monthly average outdoor temperature that
drops below 45°F during the winter months. This winter temperature limit
establishes a “southern” boundary for this climate region and provides the
rationale for differentiating regions where unvented roofs can be
constructed without controlling the temperature of the roof deck using
insulation to address wintertime condensation.
This is a particularly challenging climate—we have significant heating,
significant cooling, high moisture levels most of the year, and many areas
of moderate to high rainfall. Controlling the infiltration of moisture-laden
air into the building enclosure and keeping moisture away from cold surfaces
are major goals of design and construction. Ideally, wall and roof
assemblies are designed to promote drying to both the interior and exterior
in this climate.
For the Mixed-Humid climate we have chosen three building profiles that
we think best represent the climate and regional building practices:
- The “Atlanta” – two-story,
stick-framed, slab-on-grade, both stories vinyl sided, vented attic,
asphalt shingle roof.
- The “Charlotte” – two-story,
stick-framed, conditioned crawlspace, first floor brick veneer, second
floor wood lap siding, vented attic, asphalt shingle roof.
- The “Louisville” – one-story,
stick-framed, full basement, vinyl siding, cathedral ceiling (no attic),
asphalt shingle roof.
For information about a production builder in a Mixed-Humid climate view
our
Case Studies.
This explores the builder's experience with the Building America (BA)
program and discusses the reasons for the specific design and construction
details that are used at Health-E Community Enterprises. To see detailed
drawings on
Advanced Framing and Air Sealing Techniques. Additional information on
construction methods and alternative designs is included in the Builder's
Guide Mixed-Humid Climates at
Building
Science Press.
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