The triangles are usually either 4" or 6" thick, but another layer is plastered on top of them so the structure ends up much thicker. When I cast them 10" thick then I half size the triangles (making 4 triangles to 1) so that they are light enough to still handle. The large triangles are about 6' on a side, the half size ones or ones for a smaller dome are 3' on a side. You'd definitely want smaller panels if you go 12" thick. If you cast them right next to their final resting place you could use tilt-up methods.
I live in the high desert at 4,000 feet and the annual average temperature is 68 degrees, so I don't really need all that much R value but I believe too much is better than too little. Some areas on my roof ended up 18-20" thick.
Lately I'm more of a fan of slip forming in place, and have been using 4" thick triangles as the inside of the form.
sheelakasha wrote:
__._,_.___thanx spaceman but wouldn't it be too heavy for one man\woman to handle- a 12" thick, 2'x4' (about 60x100 cm) of PC panel? sounds too heavy for me, on the other hand reducing panel size will increase installation time.. intresting this give and take game of R-value against other factors. how big (thick,side length) were the dome triangles youve casted? ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/papercreters/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/papercreters/join (Yahoo! ID required) <*> To change settings via email: mailto:papercreters-digest@yahoogroups.com mailto:papercreters-fullfeatured@yahoogroups.com <*> To unsubscribe from this group, send an email to: papercreters-unsubscribe@yahoogroups.com <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
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