House Works: Your questions on building on bedrock, deck stripping, lichen removal

Tips for building on bedrock
Q: Should I spray foam directly on the bedrock in the crawlspace under the house I’m building or put crushed stone on the rock before spraying?
A: If you want to avoid grievous moisture problems, you need to back up with your planning. Building on bedrock is trickier than it looks. There are two difficulties— the cooling action of the rock that’ll cause condensation and sky-high crawlspace humidity in the summer, and the tendency for liquid water to