DOME PROFILE 1:7 on Stemwall – We are even further into the dangerous construction ratios at 1:7. The 1:7 ratio shown here has a diameter of 150’, dome height of approximately 21.5’ on a 12’ stemwall. The air-formed dome is sprayed in place and I don’t care how careful the sprayers are, they can tend to distort that shape. If that shape is distorted the strength of the building is compromised considerably.