All standard foundations can be used under your dome.
These include:
                    Slab on grade
                    Concrete stem walls
                    Concrete block
                    Post and beam

OPTIONAL PERMANENT WOOD FOUNDATION:

We can make a Permanent Wood Foundation (PWF) for a crawl space or full lower floor that is often less expensive than other methods and exceeds the specs of designer, the American Plywood Association. There’s a lot of material available on this separately. (link to subscription service).

In addition to our geodesic dome home kits, Domes Northwest offers pre-assembled foundation wall sections using high quality pressure treated "FDN" grade stamped lumber.  We design well above the minimum design specs of the American Plywood Association PWF Design Manual. 

We can make a crawl space perimeter foundation or a basement/lower floor.

We also offer the new ACQ treated lumber, which is considered to be environmentally safe, both in the manufacturing process & in its end use.  ACQ is an entirely different preservative process from CCA.  Both types of lumber come with 40+ year warranties. 

Our standard structural wall unit uses a 2x8 ACQ/CCA treated stud spaced 12" or 16" o.c.  The structural sheathing is 1/2", 5/8", 3/4" ACQ/CCA treated plywood.  Stainless steel nails are used below grade and special mechanically galvanized nails are used in the remaining areas.  Backfill boards, concrete slab screed boards, and 2x10 footing plates are included in our PWF system.
 

Hugh and Theresa Mayhew
5209 E. Oregon Road
Elk, WA 99009
509-292-9709
Hugh@domesnorthwest.com