Foundation Construction Notes
This dome was begun in 1979.  It was to be a "Owner Built" home under the County regulations.  We rented a caterpiller for a week to clear the land.  The majority of the week was spent logging the timber and removing 25 stumps. We obtained a blasting licence to remove the larger stumps.  The actual foundation grading took about two hours!  A transit level with a compas was used to lay out the dome.  The footings were hand dug.  The County required an 8" foundation wall despite the fact that the second floor was not going to be supported by the wall but rather on it's own pier pads using a post and beam design.  Later, the framing inspector asked us why we had poured an 8" wall since 6" would have sufficed! 
2' foundation wall with "J" bolts showing Pouring The Foundation Wall

The cement was pumped into the forms with a hydraulic boom.  The operator was a a new guy and the two of us were hard pressed to keep the nozzle directed between the forms while he learned which lever did what. The forms were rented conventional forms.  There was no need for special angled pans on the 126 degree extension corners.  The cement was poured in a "monolithic pour".  In other words, the footing and foundation walls were poured at the same time. The wall forms were placed over the footing trenches using 1"x2" lath.  The cement was pumped into the top of the wall form filling the footing in the first pass.  Subsequent passes around the wall completed the 8" x 24" high walls.  "J" bolts used for bolting the mud sill down were placed in the wet cement.  The job took two men five days to complete and turned out great.

Installing the Mud Sill
and Pier Pads

The top of the foundation was painted with an asphalt emulsion and pressure treated 2"x4"'s were bolted with the "J" bolts. 
6 mil black plastic was stapled to the mud sill and covers the inside foundation wall and ground as a vapor barrier. Clear plastic will deteriorate.  That was 23 years ago and the black plastic is still good. The pier pads for the interior post and beam support of the second floor were poured in heavy duty cardboard forms set in place. The foundation was now ready for the sub-floor framing.

foundation with vapor barrier, mudsill and pier pads in place
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