Terry Ruth wrote:Thanks for the window info. I wish I could speak German.
Do you know the burlap trick? This is essential knowledge for plastering light-straw clay walls. You use it to cover any slick material that would not otherwise accept clay plaster easily: framing lumber, exposed concrete, flashing, etc.
Take some loose-weave burlap (either coffee sacks or landscaping burlap) and cut a strip as wide as the material you want to cover, plus an inch or two extra so that it will cover the seam between materials and come over onto the straw-clay. Then make a paste mixture of 50% thick clay slip (thick milkshake or pudding consistency) and 50% flour paste (see recipe below). Rub some of this pate onto the straw-clay that the burlap will cover (you don't need to apply the paste to the other surfaces, but it won't hurt.) Soak the burlap in the paste, squeeze out any extra liquid and smooth the burlap onto the surface, rubbing hard with the palm of your hand to remove air pockets. Then let the burlap dry completely before plastering over it. This is an amazing technique; I have yet to find anything it won't stick to, and it provides a rough, fibrous, clayish surface that clay plasters bond to easily.
To make flour paste, mix 1 part white flour (or "white whole wheat" or white rice flour) into 2 parts cold water, beating with a wire whisk to eliminate lumps. Then pour that mixture into 4 parts water which is already boiling on the stove. Bring back to a boil, stirring with wire whisk all the time. If it's lumpy, you can strain through a wire colander or window screen.
so there might be condensation-water in that glue-burlap-layer which contains organic material. so it might rot under the plaster, which would not be a nice thing. that might work for interior walls, but i would not risk that on a cold outside wall.