Usually, masonry contractors place cavity flashing on their own function. Flashing functions like a barrier that retains water from getting into the building and sends it back out the wall. Cavity flashings are often required wherever the downward circulation of drinking water throughout the wall would be hindered or halted. https://sandstone-sea-wall-north81379.aioblogs.com/82075811/not-known-facts-about-sandstone-steps-north-shore