external insulation made of hemp, plaster, lime and crushed brick

Cheap, efficient, recycling materials, no lost place inner rooms , it's a good solution for retrofitting!
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Fire risk?

I am a stupid american that cant read french! I do know however, that this looks like hempcrete which is reported to have an R-value of 2 per inch but I think it would test out closer to R1 per inch... thats pretty lousy insulation. I think when you add the above ingredients, they would perform more like a thermal mass than insulation...

http://translate.google.com/translate?hl=en&sl=fr&u=http://www.apper-solaire.org/Pages/Experiences/Amet%2520Pierre%252004/Isolation%2520mur%2520exterieur%2520avec%2520du%2520chanvre%2520banche/&ei=zJbHT6CVA-iE2gW3ktWFCw&sa=X&oi=translate&ct=result&resnum=1&ved=0CDAQ7gEwAA&prev=/search%3Fq%3Dhttp://www.apper-solaire.org/Pages/Experiences/Amet%252520Pierre%25252004/Isolation%252520mur%252520exterieur%252520avec%252520du%252520chanvre%252520banche/%26hl%3Den%26biw%3D1358%26bih%3D607%26prmd%3Dimvns

Google translated link. Still hard to read.

It is not the greatest insulation according to R ratings, but it is monolithic and outside the existing mass so it works much better in real life than the R rating would suggest.

Thats a good point Scott about continuous exterior insulation performing better compared to cavity insulation values but its not going to perform above its rated R value. Cavity insulation enjoys a better Rvalue reputation than it deserves because its only describing whats between the framing. In this instance however, the R value of the hempcrete (R1 per inch) is about the same as framing or wood (R1 per inch). Dont expect much continuous exterior insulation advantages with this product.

my french is pretty good any specific questions?
also isn't hemp a big no-no is the US?

"I let it dry hemp tt summer and waited for the right temperature to coat "

The french version tells you in needs ALL summer to dry before you plaster it.