Thanks again, and very informative.
From: spaceman <Spaceman@starship-enterprises.net>
To: papercreters@yahoogroups.com
Sent: Thursday, January 17, 2013 11:27 AM
Subject: Re: [papercreters] Dome Roof
From: spaceman <Spaceman@starship-enterprises.net>
To: papercreters@yahoogroups.com
Sent: Thursday, January 17, 2013 11:27 AM
Subject: Re: [papercreters] Dome Roof
Sorry for the late reply, I just got back from an extended road trip.
I made a triple mold that has two CBC triangles and one ABA triangle because a completed 5/9 3v dome uses 30 ABA and 75 CBC triangles. That way I got the correct ratio of triangles. Using a tow mixer you get about eight panels per load, so about thirteen loads is all it takes. The mold can be removed within a few minutes of filling.
The dihedral angle was serendipitous, an effect caused by the triangles drying faster on top since they are sitting on a sand bed that retains moisture for a few days. Once the panels are dry enough to move and flip, the angle has been fixed by the cement setting.
In my area (arid west Texas at 4,000' elevation) the outer coat mostly serves to seal any gaps in the seams. It is just papercrete with more cement added to make it harder. I have blocks that have been sitting on the ground unprotected for a decade, with no apparent deterioration. If you are in a place that actually gets rain, you might have different results. Before climate change we used to get up to 9" a year :)
I made a triple mold that has two CBC triangles and one ABA triangle because a completed 5/9 3v dome uses 30 ABA and 75 CBC triangles. That way I got the correct ratio of triangles. Using a tow mixer you get about eight panels per load, so about thirteen loads is all it takes. The mold can be removed within a few minutes of filling.
The dihedral angle was serendipitous, an effect caused by the triangles drying faster on top since they are sitting on a sand bed that retains moisture for a few days. Once the panels are dry enough to move and flip, the angle has been fixed by the cement setting.
In my area (arid west Texas at 4,000' elevation) the outer coat mostly serves to seal any gaps in the seams. It is just papercrete with more cement added to make it harder. I have blocks that have been sitting on the ground unprotected for a decade, with no apparent deterioration. If you are in a place that actually gets rain, you might have different results. Before climate change we used to get up to 9" a year :)
On 12/28/2012 1:17 PM, Othello English wrote:
That web link is a quick course on dome building Spaceman, really nice work, both on the dome and the site. Couple question though,
thirty plus bricks a day is a lot, did you use just that one mold, and how did you get that slight slope in the finished bricks? I take it the 1"
thick outer coat of paper stucco is mixed like stucco but with paper instead of sand (ingenious), and in your opinion is a roof even necessary
on a dome in Texas except for the venting top? Thanks again for the scaffold advice...probably saved me a trip to the emergency room.
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