Q: I live in an 8-year-old home in the Diamond Heights area of San Francisco. When it was built, a lot of excavation was done. The foundation had a lot of rebar, but below it was a lot of gravel. I was told that the gravel was there to improve drainage. During heavy rains, water collects under the house and seeps up through the floor in the front of the house. I can see moisture under the granite entry (discoloration of the stone), and some of the moisture has crept up some 2-by-4s and onto the drywall. Is there any way to create a drainage system? This happens only with really heavy rains. Or do I have to find a way to stop water from getting under the house? A: El Nino strikes again. Every few years, the ocean current warms up, affecting our weather. Normal winters bring moderate am...
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