Here is my submission for the Natural Building - Sand - Make 12 Adobe Bricks BB.
To document the completion of the BB, I have provided the following:
- Raw materials
- Before picture of 4x8 area to receive whitewash
- Action pic (ideally, with YOU in it!)
- After picture of 4x8 area that received whitewash
Minimum requirements - whitewash a 32 square foot area (shape is not critical)
During the PTJ, I noticed that the white wash being used for the Abbey was not sealing properly and flaking off the wall… so I did some investigating and this is what I learned in my experimenting:
* scraping all the way down to the cob made it more difficult for the white wash to cure properly. The areas where we only sanded lightly sealed better, regardless of the wash being used.
*Thicker is NOT better. Anything past whole milk/cream consistency takes it out of “white wash” and into “plaster” which would require some kind of substrate such as sand to strengthen it.
*the ratios of lime to salt greatly effect the overall result. I found that by adding 1cup salt to a gallon of water first, was better than mixing all of the ingredients together at once.
*This is a SLOW process. The temptation was to add multiple layers at once which only resulted in more flaking. In fact, with such a dry environment, keeping the room air moist by misting the air frequently helped to slow down the drying process, allowing the lime to cure more thoroughly. (Thanks for the tip on that one, Josiah!)
*it is important to check the “freshness” of the lime and only make what you need in the moment. Old lime will not cure as well as freshly slaked, hydrated lime.
“Everyone thinks of changing the world, but no one thinks of changing himself.” Leo Tolstoy