Cob: Cob insulation

[Answ999 at aol.com]

Another insulation idea in current use is the Pumice of New Mexico, 
Washington, Oregon.  Have you heard of PumiceCrete   Pumice is volcanic rock 
full of little air holes, mixed with adobe or concrete in use now, or maybe 
when mixed with Cob it would do the same thing, provide insulation, lighten 
the mass a little and maybe be the best combination of mass and insulation.  
Just trucking in building materials isn't any reason not to use a particular 
building material.  Anyone who has built a home knows it is nearly impossible 
to do all construction with materials found on site.  Usually some things 
need to be trucked in.  Pearlite, Vermiculite, Pumice, are all light weight 
and will be cheaper to haul than most building materials.  
Lyle