[Cob] Cob roofing

[Shody Ryon]

Hi Phil,
I do not know about cob.
This link doesn't show cob, it shows earth bag
http://www.calearth.org/PhotoGallery/photogallery.htmlminer
don't let it fall in on anyone. There is someone on the 
list who has done this, Patric I think, if you look at 
the archives from the beginning he documents some of 
the process.

In the old days they were commonly sealed with portland 
cement based stucco for low maintenance.

The top of the domes are sometimes capped with a skylight, 
I don't know if it has anything to do with avoiding 
puddling on horizontal earth.
If I used linseed oil I personally would try to not use 
mineral spirits or boiled linseed oil because it has 
heavy metal dryers. I would experiment with raw linseed 
oil heated to increase penetration. keep in mind that 
rags that have linseed oil can spontaneously combust 
over time as it drys in the rags. I do not know if it 
applies to raw oil, but used rags could be placed in a 
sealed can or spread out well away from combustible 
material in low wind conditions, etc anyhow please be 
careful and use common sense.


Other waterproofing techniques might work better; lime 
and or asphalt emulsion. I think these waterproofings 
might need to be renewed periodically.

Hugs,
Shody

--- On Thu, 12/18/08, philmoulton <philmoulton at gmail.com> wrote:

> Has anyone successfully built a cob roof in the shape of a
> dome.