Original mortar, once protected by upper story roofs or wall plasters, is now exposed and suffers erosion by snow melt and precipitation. To repair deteriorating mortar, the first step is to analyze the original mortar to identify its particular texture, color, and composition. Next, the preservation staff documents the existing architectural elements and develops mortar with similar characteristics. Eroded mortar is replaced with new mud, an important and tedious task, but one that is effective in keeping the masonry walls sound and structurally solid to resist the weather and visitor use.
Did You Know?
William Henry Jackson; a famous photographer of Western landscapes and railroads visited Chaco Canyon in 1877 with the U.S. Geological Survey. Because he experimented with a new photographic process, all the photos failed. More...