Building Science
Built to Fargo Code
Our process meets the minimum standard set by the city building inspection department adjusted down for current code year exceptions removed from code, i.e. in 2021 IECC Fargo has adopted a foundation waterproof standard, and it is in process of enforcing it. Average HERS rating of 64 based on 2.3 ACH air leakage rate and U-value of windows.
Built to Full 2021 IECC Code
This would include continuous insulation to exterior of envelope from basement floor to roof, and it would reduce energy consumption for HVAC by an additional 16%. Average HERS rating of 48–50 based on 2.3 ACH air leakage rate and U-value of windows.
Built to ND Residential Code
Current standard only requires foundation wall damp proofing, no radon control, no fresh air system installation, and no envelope continuous insulation first required in 2012 IECC but exempted out. Red River Valley has a high mold risk from a below-ground high water table.
High Performance Homes
Our homes are built to 200-year+ life with continuous envelope insulation, [rain screen exterior to stop moisture drive and outside sounds into living area]. They are also built to the minimum code requirement in Canada and Europe since 2000. In the MSP market, these home sell for 10–14% premium with an appraiser-led study in 2019—ask for a copy.
Energy Movement Through Envelope
Heat, cold, humidity, rain water, ground moisture, and outside air pressure all impact inside conditions and rate of energy use to provide basic levels of comfort. Energy moves in all 6 directions (up, down, sideways (N, S, E, W)) simultaneously, and at a rate of speed dependent on the temperature differential of outside-to-inside temperature—it’s not just up!
HERS Rating Adds Value to Home
The Home Energy Rating System (HERS) 0–100 is nationally recognized by lenders, appraisers, and the secondary market such as Fannie Mae & Ginnie Mae loan packaged securities. Good is below 50, and Best is below 40. A “HERS 0 rating” means net-zero [home].
What are Healthy Living Conditions?
- It is best when the inside envelope’s MRT (mean radiant temperature) is less than 6ºF from air temperature; inside temperature at 70º F versus wall of envelope temperature is above 64º F in winter; in summer below 84º F with inside temp of 76º F
- When humidity is between 45RH and 55RH, it’s healthy with very low virus transmission
- Fresh air per occupant is above 20 cfm, and CO2 levels PPM below 800
- Exterior noise transmission level is very low to quiet (under 2 sones), e.g. no dog barking sounds, no overhead jet noise, no outside motor sounds—peace and quiet!
- Air filtration with minimum MERV 13 to MERV 15 filtration to capture volatile organic compounds (VOC), mold, and odors from cooking and inside activities
Comfort
Comfort is based on the rate of radiant energy leaving your body. It’s not air temperature alone.
Forced Air Heating and Cooling
This is the most basic mechanical system. It comes on 2–3 times an hour in winter with 4–5º F temperature swings every 20 minutes + fan noise + dust. Due to a high on/off cycle, typical life is 12–15 years.
Radiant Floor Heating
Hydronic fluid heats space from the floor-up with even temperatures during the main heating season. This system requires 48 hours to switch from floor heat to cooling in the spring, and in the fall months with overheating in the afternoons a common issue.
Ceiling Radiant Heat & Cool
Panels hidden above the ceiling radiate warmth onto occupants in heating season with even temps within 0.5–1º F, 60 min. per hour. Ceiling panels cooled in summer absorb body heat to cool the occupant with even temps within 0.5–1º F all of the time. This is 32% more efficient than forced air systems with 15-year life vs. 30–40-year mechanical system life and more. 4 million new homes were projected in 2023 to be built with radiant ceiling heat and cool panels, all powered by a cold climate air-source heat pump, (plus utility rebates and 30% federal IRA tax credits).
Windows U-Value
The lowest U-value in your budget provides the most comfort. Double glaze windows in 0.26–0.30 U is common. The best option is triple glaze windows in 0.14–0.20 U (this is common) with lower numbers better, and raising MRT by over 10º F, vastly improving comfort.
High CRI Lighting
Above 90 CRI is preferred for the least eye strain and a lower energy use, relaxed environment. Human Centric Lighting (HCL) in LED’s will color shift to mirror the Sun from morning to sunset. Studies show a 4–6% increase in wellness, comfort, and productivity.