Build a Geodesic Dome Home

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Photo 1: The foundation.
Photo 1: The foundation.
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Photo 2: Floor joists.
Photo 2: Floor joists.
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Photo 3: Riser walls.
Photo 3: Riser walls.
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Photo 5: Studs
Photo 5: Studs
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Photo 4: Studs
Photo 4: Studs
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Photo 6: Plywood shell
Photo 6: Plywood shell
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Photo 7: Framing
Photo 7: Framing
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Photo 9: Insulation
Photo 9: Insulation
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Photo 8: Siding
Photo 8: Siding
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Photo 11: Outside
Photo 11: Outside
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Photo 10: Framing inside walls
Photo 10: Framing inside walls
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Photo 12: Tape finishing the joints
Photo 12: Tape finishing the joints
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Photo 13: Installing the staircase
Photo 13: Installing the staircase
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Photo 14: The staircase
Photo 14: The staircase
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Photo 15: Metal hubs
Photo 15: Metal hubs

The four of us spent that December 25 in quiet celebration. The next day came the party. Fifty-six people arrived to help us bring in the season, and to run their hands over the shapes and marvel at the expansiveness of the space. They discovered what Juliet and I had years earlier: a dome makes people stand in wonderment.

No longer solely a symbol of the minimalist counterculture, today’s dome home can be as simple or as extravagant as you wish. Through our new home, we hope to show that a dome can be the starting point for a modern living space with character-one that is at once comfortable and awe inspiring, offering the ultimate in open floor plans, vaulted spaces, energy efficiency and solid construction.

We started with a 40-foot diameter, 5/8 sphere dome kit from Timberline Domes of Berkeley, California. It was a hub-and strut system that you assemble on-site (kit price for the hubs, struts, plywood, dormers, extensions and skylights is less than $30,000). Since the dome shell is self-supporting, we were free to design inside what might be described as a multilevel contemporary home.

The structure of a dome shell allows for up to five natural openings around the base of the shell.You can extend the wing space out through these openings and build flat faces on them for conventional doors and windows. We took advantage of all five natural openings using extension kits. We started with a poured-in-place foam block foundation using Blue Maxx® blocks (photo I). We chose them because they had an adjustable angle corner block that was ideal for the nonstandard angles of a dome foundation. The blocks serve as forms for your concrete, then stay in place as your foundation insulation (R-40 when complete). It is the perfect way for a trained do-it-yourselfer to build a foundation.

After having a structural engineer look at our design, we put three steel beams in to support the main floor. We chose steel to allow a post-free basement/garage. Over the steel beams we built the main floor decking with TJI Silent Floor joists. These are manufactured wood I-beams that are light to carry, come up to 40-feet long, and are strong enough to hold up an elephant (photo 2). For the subfloor we used 3/inch tongue-and-groove fir plywood. Fir was recommended as being more resistant to water damage. Since it was almost five months before we had a watertight roof, this floor got soaked on many occasions. It was well worth the extra money.

  • Published on Jun 1, 1999
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