The framework
The nine domains
Sage Co. works from nine fixed domains. They do not change from house to house, and nothing gets added or renamed to fit a project. Each page below answers what the domain is, why it matters in a hot-humid Central Texas home, what we can state with confidence, and where the evidence is still incomplete. Every claim carries a grade.
Last reviewed August 29, 2026.
- Domain 1[ESTABLISHED]Established
Building Science
Air, heat, and moisture control designed as one assembly, in the direction Central Texas actually drives them.
Read the domain page - Domain 2[ESTABLISHED]Established
Indoor Air Quality
Source control first, then designed ventilation, then filtration — specified and measured, not assumed.
Read the domain page - Domain 3[ESTABLISHED]Established
Moisture & Mold
Keep water out, keep surfaces above condensing conditions, and dry what gets wet before it is covered.
Read the domain page - Domain 4[EMERGING]Emerging
Materials & Toxicology
What a product emits and discloses decides whether it can be specified — verified before it enters the catalog.
Read the domain page - Domain 5[ESTABLISHED]Established
Water Quality
Test the actual source, then choose treatment and plumbing materials to match the result.
Read the domain page - Domain 6[EMERGING]Emerging
Light & Circadian Rhythm
Daylight access and glare control first; electric lighting specified for spectrum, control, and dimming behavior.
Read the domain page - Domain 7[ESTABLISHED]Established
Thermal Comfort
Comfort is surface temperature, air movement, and humidity together — not a number on a thermostat.
Read the domain page - Domain 8[ESTABLISHED]Established
Acoustics
Exterior noise, assembly ratings, and mechanical sound treated as design inputs before framing, not after.
Read the domain page - Domain 9[EMERGING]Emerging
EMF
Wiring practice, device placement, and measurement — documented honestly, with the uncertainty stated.
Read the domain page