DBS wrote:Good thought. But expensive to do. I will do more looking into it. DBS
I can not imagine it working very well with augments, etc.
BWARDEN wrote:DBS would know this better than I, but one of the functions of the airform is to allow you to pressurize the inside of the dome during construction. This alleviates a lot of problems with supporting the weight of the wet, curing concrete. My guess is that if you didn't have the counterforce of the air pressure, the required mechanical support to hold up the weight of the concrete might counteract any price advantage of substituting a cheaper material than the airform. The air pressure support is also, by laws of physics, uniform over the shell, as opposed to possible weak spots in mechanical supports that may result in localized sags in the shell. So, I wonder the value of using the canvas to replace the airform. But then, Mert Hull, and others have used light weight polyethylene plastic airforms with low air pressure to successfully build domes.
That said, to me, one of the largest problems with MD homes is the outer coatings. My polyurea coating has bubbles, and does not seal over some of the airform seams due to problems during spraying. The nature of the coating makes it difficult to over spray it to repair the problems. Perhaps concrete soaked canvas, laid over a finished dome, similar to putting paper mache sheets over a blown up balloon, would be a better alternative than chain shell. The canvas strips could be laid in an "artful" manner, such that the overlapping seams made some sort of pleasing pattern. MDI had done similar things with sheet metal coverings. The possible downside is that the canvas may rot over time, eliminating the concrete reinforcement of the shell. The canvas could be woven out of a synthetic material instead of cotton that may not rot. Or use a synthetic mat, similar to that used in landscaping weed suppression. Any non rotting material that could be soaked in fine sand concrete and applied to the dome. Lots of possible experiments here.
Too many possibilities, and too few homes being built to try them out.
Sammual wrote:This looks like it might be a fantastic airform covering.
Can it be painted?
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