--Update 3--
Currently visiting
Amy Gardener (permies staff!) in New Mexico. It's been a real treat to be here: my first time ever in the state.
The big
project we're tackling while I'm around is to repair the exterior of a 20+ year-old adobe structure:
My first task: break up a bunch of horse manure. Amy is fortunate
enough to have a neighbour with a pair of horses. Amy receives a barrow-full of fresh manure each morning, so this was the closest to grass that manure ever could be. I broke it up into smaller, fibrous bits, then pressed it through a hardware cloth mesh. The result looked (and smelled) just like grass clippings.
The manure was blended in a
bucket along with a cooked flour paste.
Using a scrub brush, we applied the paste to the exposed
wood on the upper part of the structure's walls. These were actually the roof supports. The goal was to cover the wood with mud, but the paste needed to be applied to provide a stickier surface to which the mud would adhere.
We then used some loose-weave burlap in this 6-inch wide strips as a kind of "lathe for the plaster."
The burlap was added to the areas where we had applied paste, further providing more purchase for the mud. A second layer of paste was added to the burlap once it had been secured.
Amy mixed our mud, and we added in a small amount of the paste mix to the sand, clay, and
water.
The paste was a huge help during the application process! Normally, mud won't stick well to wood, but after the paste and burlap layer was added, the first layer of mud was much more cooperative.
Mud was added to any burlap and exposed wood around the roof-line of the structure.
After we emptied the mud pan, I scored the surface with the hand trowel so there will be a rougher surface for an additional layer to stick to.
The drain channels, or
canales, on the roof of the structure needed some additional support as well. I think one of the best aspects of building with adobe and
cob is that you can easily modify a structure after it's been built. Here's we added some simple shelf supports underneath one of the canales. To achieve a good fit, we broke away some of the dried outer shell of the building.
The finished supports were linked to a strip of wood to distribute the weight of the canale. The whole of the support will be covered with burlap and the green paste, and finally by a layer or two of mud, to integrate the supports into the structure.
That's all for now. We're back to work tomorrow.
