Property Specifications

  • Address:  1577 Gravel Springs Circle, Jacksonville, IL 62650. The cedar geodesic dome home was built in 1975 in a quiet covenanted community co-founded by the owner-builders, two miles WNW of Jacksonville, Illinois.
  • Approx. 2700 sq ft home, 4 level open-plan including: living room, eat-in kitchen, family room, lower-level rec room, cupoloa space, 4 bedroom, and 4 bathrooms. The design is based on the mathematical calculations of Buckminster Fuller (wikipedia.org/wiki/Buckminster) and designed by the owner-builders. The home is on the market for the first time since it’s construction and subsequent remodeling and updating.
  • The dome features soaring living spaces, including an 18 ft ceilings in the living room, high-ceilings in the dome bedrooms, and extensive skylights allowing the home to be bathed with natural light. Upstairs bedrooms have expansive pentagon-shaped insulated triangular windows. The wooded property and extensive acreage allow for privacy at night, without the need for window treatments to block the views.
  • This kitchen features an efficient, open design with freshly painted white cabinets and new countertops, and an adjacent dining area with views of the property. Features include:
    • New stainless steel ice and water in-door Maytag side by side refrigerator
    • New SS Maytag convection electric stove
    • New SS Maytag over-the-stove convection microwave with exhaust hood venting to the outside.
    • New SS European Blomberg dishwasher.
  • The home contains 19 skylights, designed to take advantage of the arc of the sun. A hexagon formation of six triangles is centered high in the 18 ft. domed living room ceiling, with smaller skylights throughout. All skylights have a solar reflective exterior coating and are made of ¼” plate glass. The skylights are insulated with a  separate unit securely floats on 5/4” stops beneath the plate glass.
  • Bedroom amenities include:
    • Built-in vanities, dressers, lighted closet storage.
    • All second-floor bedrooms have their own sink in addition to a shared bathroom.
    • All basement suites have their own en-suite bathrooms.
  • The walkout basement features a glass patio door framed by picture windows facing the horse pasture. The basement includes:
    • A large tile-floored family room, with a wood open-beamed ceiling
    • 2 Bedroom/bathroom suites.
  • The home is topped by a pentagon-shaped cupola with operable panoramic insulated windows, accessed by a finely finished architectural wooden ladder. The cupola is open to the rooms below, with custom-designed epoxy-coated steel grills providing safe vertical air movement throughout the home. The grill designs echo the hexagon pattern in the living room ceiling. This 13-foot diameter pentagon-shaped room has a variable speed-booster fan for HAVC custom comfort control. The cupola features:
    • Telephone outlet (with extra wiring installed for future multiple lines as needed)
    • Category 6 high-speed Internet port, and coax for TV
    • An 800 lb-rated marine grade eye bolt, from which a swiveling suspended hammock chair is suspended for optimal viewing of the entire surrounding area.
  • 3 ½ Vehicle Garage and workshop (24’ x 48’). The garage features fiberglass insulation in walls with ½ foam board over studs, then drywall on the interior walls and wood ceiling, everything painted white, with an insulated attic. All wiring is surface-mounted gray PVC, preventing air infiltration through wall penetrations, with multiple 240v and 120v outlets, including two ground-fault outlets on the outside. There are a red steel service door, an 18’-wide sectional garage door with opener, and a 9’ sliding door for 3rd vehicle bay space. For security, there are no windows in this structure. Additional storage is found in a 16’ x 12’ area, plus 8’ x 12’ insulated storage area with shelves. Extensive built-in cupboards with doors. Generous fluorescent lighting with multiple switches, as well as a pull-down ladder to attic storage. A 240v window AC unit, 240v electric heater, for year-round comfort. Garage also has wiring coming from house for telephone, coax for TV, and Category 6 Internet service. There is a utility water service hydrant outside garage service door with well water.
  • All eleven main-floor picture windows are insulated triple pane, which provide a 360 degree panoramic view. There are triangular vents under each window main-floor picture window (currently sealed, but could be reopened if desired).
  • The dome is laid out such that only about 60 square feet is used for hallways. The home has a front door “airlock” with keyless entry.
  • In the area south of the dome is a 16’ x 18’ enclosed stable with 8’ sliding door, automatic heated horse waterer inside, all within fenced-in area pasture. Two utility water hydrants to service this pasture using well water, from two wells on our property. There are extensive wooded and off road trails on this property if the adjacent 20 acres are purchased.
  • Laundry: The home includes two areas for electric dryer and washer hookups:
    • Main floor alcove with bifold doors in the den
    • Basement bedroom/multi-purpose room.  No washer or dryer is provided.
  • Heat pump for efficient heating and cooling.
  • Electrical service is provide by Ameren.
  • Telephone service is provided by Frontier.
  • There is a dual chimney with flue liners for two wood stoves if desired, one on the main floor in the living room and another in the basement family room, but no wood stoves are provided.  A chimney cleaning ladder is permanently attached to exterior of chimney with access through cupola window—if  one is agile and skinny enough.
  • All above-grade floors are originally constructed of 2×6 tongue and groove untreated southern pine.  All floors have new coverings including commercial duty vinyl, top-quality carpeting, and newly refinished parquet oak flooring in upstairs bedrooms.  Two basement floor areas are covered with ceramic tile. The dome interior and exterior were recently repainted. The two outside decks were also recently repainted, as were the garage and stable.
  • The home is constructed by assembling 105 precisely hand crafted triangular panels, with 2×4 framed plywood-skinned, nailed and glued. Each of the triangles were bolted to the adjacent triangles, creating a structural framework essentially of 4×4’s (2 2×4’s bolted together). The edges of the 2×4’s on the outside of each triangle were all beveled at 7 degrees, so they would all fit tightly together in a round structure. Technical Description: 37’ diameter, 5/8 sphere geodesic dome, 3-frequency icosahedron, vertex zenith.
  • The dome structure is bolted down to a 15-sided poured concrete, steel-reinforced foundation with 10 steel rods passing from the base of the first row of triangles, then mechanically fastened with ¼” plate steel toggles to foundation bolts anchored in concrete.
  • The house has foam insulation in the exterior wall cavity plus 2” of pink foam board that was added in 2011 reroofing project onto exterior, then a new roof was created over that leaving a 1.5” space for air to flow from soffits to roof peak. This is a strong, tight, well-insulated home, essentially with an umbrella over it.
  • Water Supply:
    • The home is supplied with “city” water provide by the North Morgan Rural Water District from the Jacksonville water system.
    • There are two wells servicing 5 outside freeze-proof hydrants and the heated insulated automatic water receptacle horse-high in the stable.
    • A fire hydrant is located within 20’ feet of our lot boundary.
    • There are two adjacent utility water hydrants 25’ away from the house, with water supplied by the water district.  On a post adjacent to them is a dry (never frozen water plugging it) garden hose with a fire nozzle. When coupled and tested, a stream of water reaches the cupola for DIY fire protection.
    • Otherwise, fire service is available from Chapin, which is currently used, or the city of Jacksonville for a larger fee.
    • In total, we have five outside hose hydrants on well water and five more on city water.
  • General Features:
    • Central Vac
    • Dish Satellite for TV, TV Antennae
    • Illinois Rural Telecommunications Co. 6 Mg Internet Service, with household wifi plus Category 6 wired service
    • TV coax to all rooms excluding bathrooms, can be switched in utility room for satellite or antenna.
    • All 14 individual telephone circuits return to punchboard in utility room, which would facilitate simple installation of office phone system if desired.
  • The driveway, outside yard, and buildings are illuminated automatically by globe lights, with other lights by all doorways on the garage, house, and stable. From several locations in the house, spotlights on the cupola can be turned on to illuminate around the dome 360 degrees.
  • Climbing toy with a fort that has its own light and ground-fault outlet.

Future Expansion: Electrical and hot and cold water service, and other open conduit provisions have been made to easily facilitate future first floor expansion off of den exterior sliding door. The full bath on the main level, next to a den, which together could easily be converted to a bedroom/bathroom suite.