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

• 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?

Retrofit High Performance Details

Retrofit High Performance Details

Retrofit High Performance Details

Retrofit High Performance Details

Retrofit High Performance Details

Retrofit High Performance Details

“After” Details