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RAISED WOOD FLOOR The domes can be built utilizing the same choices as conventional housing: a) a monolithic slab; b) poured footing with a stem wall and then a poured slab on fill; c) poured footing with a stem wall and then a raised wood floor; d) basement, depending on which is more advantageous for your area. We can do a concrete wall to support the dome and a wood first floor. We can replace a concrete slab with raised wood floor and design the first floor joist: The cost depends on the complexity from $100 -$200 for the 27' thur 48' residence dome. The garage dome would need a concrete slab. The Foundation Building Plan sheet asks that you check with your building department as to how deep the footers should be for your climate. All foundations are designed and laid out so a rebar comes up three feet into each of the riser wall seams. Those seams are filled with concrete as the dome kit is assembled. Rebars are designed into the slab to extend up 3’ into each of the riser wall seams. Once the riser wall seams are filled with concrete the dome is secure to the slab. Once the riser wall seams (horizontal and vertical) are filled with concrete the dome is secure to the slab. The riser wall aligns flush with the edge of the slab. When you fill in the riser panel's bottom seam area you fill the area along the bottom edge of the riser and the edge of the foundation. You can prepare the foundation and later erect the dome. The only thing unusual about our foundation is its shape. Because our dome is lighter than most other buildings, it has less loading on the foundation. Basement Plans are also available. Because we cannot evaluate your soil suitability from here, you would need to consult with someone locally about the suitability of your topsoil. Possibly a building department, soils engineer. Our foundation does not require anything more than 2000 lbs. per sq.ft. soil bearing capacity. Basically if you can build a regular house on your soil, you can certainly build a dome. The multiple sided foundation for our dome is only slightly more difficult than a conventional house and should not affect the cost more than 10% at most 20%. If they would mark the corners of the foundation itself and remove that responsibility and fear from the contractor. You will find that will give them a better price. The tolerance on the foundation is very forgiving. You can be off 1-2" in any dimension without any significant consequences. We cannot provide Building Plans for wood foundations, connections to existing buildings or unusual designs that are beyond our knowledge.
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