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Case Study: Edminster-Bohner Residence (Renovation). Pacifica - < 1 mile from coast. 30+ inches of rain annually, all from November thru March 2860 HDD, spread evenly over the same period Winds from the west, but sheltered site. SFD with home office.
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Pacifica - < 1 mile from coast • 30+ inches of rain annually, all from November thru March • 2860 HDD, spread evenly over the same period • Winds from the west, but sheltered site
SFD with home office • 50+ years old, with recent second story addition • 2 by 4 wood-frame • Cathedral throughout • Attached garage • Terraced lot in steep, well-drained slope
SFD with home office (cont’d) • Vented, unconditioned “tight” attics • Vented, “unconditioned” crawl • Forced hot air heat, no active cooling • Single-pane metal windows • Asphalt shingle roof
Crawl Details • Wood-framed stem wall below-grade) • FA heating ducts – metal, uninsulated
Crawl Details • Wood-framed stem wall below-grade) • FA heating ducts – metal, uninsulated • Exterior grade gypsum wall sheathing
Crawl Details • Wood-framed stem wall below-grade) • FA heating ducts – metal, uninsulated • Exterior grade gypsum wall sheathing • All wood in direct contact with concrete (walls and piers)
Crawl Details • Wood-framed stem wall below-grade) • FA heating ducts – metal, uninsulated • Exterior grade gypsum wall sheathing • All wood in direct contact with concrete (walls and piers) • High wood MC, but not universally • NO wood rot or surface mold (save on gypsum)
Crawlspace Performance Profile • Things are getting wet • Wood wall • Uncovered bare soil • Things are drying • 6-month split • Energy hog ducts • Vents? • There is some kind of balance (for 50+ years) but what about changes?
