50 Ways to please your mother – Earth!
This list represents Earth friendly features we used
in the building of our geodesic dome complex.
Natural Spaces Domes World headquarters in North Branch, Minnesota, has 9 domes. They
include our new certified Energy Star 5 Plus Bear Creek Dome, Forest dome, Office dome,
two shop domes, Bear Creek Cabin dome, and a few others. We invite you to visit our facility
and see the features we list below. We practice what we preach.
- The exterior dome shell uses 60% less structural materials to build than a similar-sized
conventional box house.
- In our new Bear Creek Dome, we utilized 18” thick walls and roof providing an R-value of 55.
Our other non-dome walls are 12” inches thick with an R-40. Most Minnesota homes have R-
20 walls and R-38 roofs.
- Formaldehyde-free fiberglass insulation made from recycled glass along with insulation made
from recycled blue jean material.
- Two blower door tests were done during the construction of Bear Creek Dome. We utilized
smoke bottles and an infrared thermal scan gun, allowing us to “tighten” the house and
eliminate air and thermal “leaks”.
- Extensive use of triple pane skylights (by Natural Spaces Domes), greatly reducing energy
loads and drafts caused by cold inside glass. Solar tinting on upper south facing skylights
reduces summer time heat gain and overheating.
- Use of triple pane glass instead of Low "E" coatings in selected areas, increasing the indoor
plant growth, creating a healthier environment.
- Marvin triple-pane windows for all the new conventional (non-skylight) glass areas with Low E
coatings and argon gas between panes.
- Windows positioned to take advantage of morning solar gain and eliminate hot southern and
- Use of Cupolas on the dome structures combined with operable windows at the floor levels,
allowing for natural cooling and fresh air intake thru non-mechanical means. Ground cooling
design features mean night time air is cooler in summertime. The circulation in a dome allows
for easier natural air flow.
- Extensive daylighting from skylights & windows allow outdoor views from all work stations &
offices, reduces need for internal lighting during daylight.
- Use of Velux Sun Tunnel for daylighting over work area.
- 85% of all lighting is compact fluorescent lighting. The remaining 15% is low wattage halogen.
- Frost Protected Shallow Footing system eliminates extensive excavation.
- The concrete slab radiant-heating system utilizes hot water flowing through PEX tubing. It is
proving to be extremely energy efficient for a 3200 sq. ft. home located north of
Minneapolis/St. Paul, Minnesota..
- Two boilers for radiant heating to provide a backup system if the power goes out and to test
the cost efficiency of gas versus electricity. Natural gas “Munchkin” boiler 92% efficient.
Electric boiler is 100% efficient.
- Instantaneous, high efficiency, natural gas water heater provides unlimited hot water without
storing 80 gals of hot water 24/7.
- All new appliances have high Energy Star ratings. The mini-split air conditioning system has a
SEER rating of 19.
- Electric stove to prevent toxic gas emissions.
- Dual-flush toilets for water conservation. (1.1 gals or 1.6/flush.)
- Clivus Multrum composting toilet in operation in Forest Dome since 1975.
- Low-flow shower heads. (1.5 gpm)
- The “whole house” water filtration and softening system uses less water and no salts while
processing all water usage.
- The air-to-air heat exchanger constantly brings in fresh air and exhausts stale moist air.
- Low noise, highly energy efficient bath fans.
- Concrete floors utilizing flyash additive which is ash from coal- burning plants.
- Concrete floors were stained, eliminating the need for carpets or other floor covering.
- The majority of the wood used is FSC certified.
- Extensive use of fallen and reclaimed wood such as the white oak window sills and bathroom
counter tops, entry porch cedar posts, and rough- sawn pine door trim. The white pine wall
paneling is fallen wood from our property. The white pine for the floors and stair treads was
harvested due to road construction (“road-kill”) in the immediate area. The railings are nondebarked
fallen cedar from northern Minnesota. Reclaimed redwood is from an 1890
Grainbelt Beer brewing vat.
- Cabinetry is from IKEA, which are built with non-toxic materials and sustainably managed
- Zero hard-surface exterior paving areas allows water to flow into the ground for plants and
- Recycled crushed concrete driveway topping.
- Man made exterior concrete "stone" wall surfacing eliminating repainting and maintenance.
- Minimal usage of PVC piping, reducing toxic chemicals.
- Use of machine-hewn 2x6 "log" siding on exterior walls with non toxic stains. This will "age"
naturally requiring minimal maintenance especially with wide roof overhangs. Eliminates
the use of PVC "vinyl" siding.
- Recycled steel mantle has a special rusted surface that never needs finishing.
- Fireplace hearth rock is taconite stone from an abandoned northern Minnesota iron mine.
- Galvanized steel entry porch “cool roof.”
- Mold-free sheetrock with no paper facing.
- All bedrooms equipped with an electrical shut-off switch eliminating all electromagnetic fields
in the bedroom and around the beds.
- Fireplace utilizes outside air for combustion with sealed glass doors. Fireplace designed with
vents to heat other rooms in dome.
- Non-toxic no VOC paints, stains and wood sealers from AFM Safe Coat and Pittsburgh
- No sealer or coating on interior wood triangle dome panels.
- Ceramic Tile made from recycled product.
- Wildflower and native habitat protected and encouraged yard. No “artificial” lawns.
- Recycling and composting areas planned into cabinet layout.
- Handicap accessible throughout main floor, all doors 36” wide, front door is 42” wide, no steps
which increases the long term use of the home.
- Extensive use of existing Evergreen trees for shading & cooling.
- Use of dead & downed trees from only a few acres of our 50 acres and scrap wood from our
dome building shop is burned in a detached, high efficiency wood heating system, providing
heat for 10,000 sq. ft. of enclosed space in 5 domes.
- Reuse of many architectural antique items in the design of the structures.
- Motion sensor lighting switches in office turn off lights when you leave the room and turn them
on when you enter.
37955 Bridge Rd., North Branch, Minnesota 55056 USA
Just 45 minutes north of the
Minneapolis/St. Paul metro area.
View A Google Map
United States: 651-674-4292
International Phone: 01-651-674-4292
International Fax: 01-651-674-5005
Facebook: Click here
Office Hours: 8:30 - 5:00 p.m. Monday - Friday
Weekends: Appointment Only