 You see bricks and mortar are very porous. When it rains, it takes less than 20 seconds for water to get in through the bricks. If it stays behind the bricks, that moisture can create mold, mildew, or even find its way inside your home. To make sure it doesn't stay trapped, it flows downward and back through the weep holes. If you're worried about critters getting in, you can block the holes with wads of fiberglass screen that still allow the moisture to escape. I'm Danny Lifford with tips for today's homeowner.