Using asphalt as a glue is a fascinating idea. The first caveat that comes to mind is the potential britlleness of cured asphalt under cold extremes. Yes I see you had a test piece that stayed together, but did you have it under load or apply dynamic stress to it when it was exposed to your coldest outdoor temperatures? I am assuming your yurt will be exposed to buffeting winds, heavy rains, possibly snowpack. Will asphalt or coal tar maintain the shear strength necessary to keep your yurt upright or will it crack and allow joints to fail?
Likely there are reasons why tar isn't used as a glue for building construction and epoxy is. As a side note, since your application is using a fairly thick polyiso sheet, have you considered using wood joinery techniques like biscuits, mortise-and-tenon, or pegging to attach your sheets together? Using epoxy just on these smaller joint pieces would not require gallons of expensive glue. And maybe used in conjunction with the asphalt to seal the edges would be a workable solution. --Wolf On Monday, August 14, 2017 at 7:00:25 PM UTC-7, ken winston caine wrote: > > ... > > So .... think I am going to run another test with asphalt emulsion. Last > time I tested it was with small pieces of foam in 2011. They grabbed > together beautifully and would not come apart and I saw no deterioration of > the foam over a few weeks. Think I tossed the test pieces after about a > year. They firmly held together through freeze and desert summer heat. That > may be what I go with for this experimental housing project of mine. Really > need to hold the costs down. > ... > -- You received this message because you are subscribed to the Google Groups "hexayurt" group. To unsubscribe from this group and stop receiving emails from it, send an email to hexayurt+unsubscr...@googlegroups.com. To post to this group, send email to hexayurt@googlegroups.com. Visit this group at https://groups.google.com/group/hexayurt. For more options, visit https://groups.google.com/d/optout.
