District of Columbia · IECC Climate Zone 4A · Mixed-humid urban
Healthy Homes for Washington, DC — Rowhouses, Humidity, Urban Air
Virtual Home Health Score assessments in all eight wards. GaiaCrete™ detailed for the District's Zone 4A humidity swings and 2017 DC Construction Codes. Founding Mr Hemp House® dealer territories open by ZIP code.
Sharp seasonal humidity swings
District homes go from 70-degree dew points in August to bone-dry radiator heat in January, cycling plaster, wood, and occupants through both extremes.
Urban air quality and summer ozone
Traffic-related particulate and regional ozone reach into leaky District rowhouses, where unfiltered infiltration bypasses any air cleaning.
Older housing stock
Much of the District's rowhouse inventory predates 1940, with no air barrier, no designed ventilation, and legacy finishes that complicate retrofits.
What Climate Zone 4A Means for District of Columbia Homes
The District of Columbia is a single Zone 4A jurisdiction where humidity swings hard between a muggy Potomac summer and a dry heating season. Its rowhouse and pre-war apartment stock is among the oldest urban inventories in the country, largely built before mechanical ventilation. Dense traffic corridors and summer ozone add an outdoor air-quality layer that the envelope has to manage.
2017 DC Construction Codes (IBC 2015 based)
The District adopts the I-Codes with DC amendments, including a separate DC Energy Conservation Code and green construction requirements.
Start With Your Home Health Score in District of Columbia
Digital Home Health Score screening is available nationwide. In-person Professional Healthy Home Assessments are not yet scheduled in District of Columbia. Contact Mr Hemp House® for current product, dealer, consultation, and installation availability. Availability varies by market.
Home Health Score
A free screening that scores your home across indoor air quality, moisture and mold risk, building materials, and ventilation — so you know where to look first.
Healthy Home Assessment
A professional walkthrough of materials, moisture conditions, and ventilation, delivered as a prioritized action plan. Screening and guidance — not a medical or diagnostic service.
One part of the platform
GaiaCrete™ Hempcrete / Hemp-Lime Building Materials in District of Columbia
GaiaCrete™ is Mr Hemp House's hempcrete / hemp-lime building material alternative. It is used for new construction, retrofits, and insulation upgrades as one part of the Mr Hemp House® platform, alongside the Home Health Score and Healthy Home Assessment.
- Thermal planning reference R-2.5+ per inch
- Class A surface burning characteristics (ASTM E84) — material behavior, not an hourly assembly rating
- Alkaline mineral composition may be less conducive to some biological growth conditions
- 100% Biobased Carbon Content (ASTM D6866-22)
- Vapor-permeable, hygroscopic, no added VOCs
- Net carbon sink by design
Actual thermal performance varies by formulation, density, moisture content, installation method, and complete wall assembly. Final whole-wall thermal performance depends on the complete assembly, including material density, framing, finishes, thermal bridging, moisture conditions, and installation.
Be the First Mr Hemp House® Certified Dealer in District of Columbia
District of Columbia has no certified dealer yet. Founding dealers get territory priority, training, and direct GaiaCrete™ supply as the platform expands.
Claim the District of Columbia territoryCredentials Behind Every District of Columbia Project
Mr Hemp House® was founded in 2018 in Orlando, Florida.
Veteran-Founded, Veteran-Owned
Founded and owned by a U.S. military veteran.
SBA VOSB Certified
SAM.gov Registered
Active registration in the System for Award Management.
IMPEL Cohort
DOE / Lawrence Berkeley National Laboratory Innovation Program cohort.
VIP Procurement Cohort
Veteran Institute for Procurement graduate.
DOE Zero Energy Ready Home Partner
U.S. Department of Energy Zero Energy Ready Home program partner.
Beta Analytic Verified Testing
ISO/IEC 17025-accredited testing — 100% Biobased Carbon Content per ASTM D6866-22 (Certificate #531872642609133657, October 2022).
District of Columbia Healthy Home FAQ