On the south bump-out, we selected yellow ocher. We’ve used this color frequently throughout the interior of the house—we must really like it. We chose it for the south bump-out for a specific reason: the intensity of the southern sun. We have noticed that the dark frames of our windows become very hot in the midday sun and cool quickly at night. The thermal expansion and contraction of the frames have caused a small bit of plaster to slough off in several places. A large dark plaster wall would also be subject to increased thermally-induced movement. Therefore, we opted for a light color to minimize the expansion and contraction that occurs during the day and night and across the seasons. Plus, the dark window frames in the pale yellow wall look fantastic.
Scott repaired the plaster with a commercial concrete patch mix with polymer additive to make it more elastic. He made an expansion joint at each problem area around the frames. Then we covered the south bump-out wall with a paint created from pigments we purchased from Capital Ceramics in Salt Lake City - a mixture of yellow ocher, ceramic brown and raw sienna. In addition to the pigments, the lime wash consisted of one part Type-S lime and three parts water.
Scott declared that we were going to revert to our tried and true color – yellow ocher.