HouseChalk
French drain
A French drain is a gravel-filled trench with a perforated pipe that collects and redirects groundwater.
Why it matters
French drains can intercept water before it reaches a foundation or low area. They are a common solution for yard drainage and basement moisture.
Where people get this wrong
A French drain is not a surface drain. It handles water underground. The pipe needs to drain to daylight or a sump. It can clog without filter fabric.
Real-world example
Water pools in the yard after rain. A French drain is installed along the wet area. The water now drains underground to daylight at the property edge.
Where this hits your build
This matters during site work and foundation. Mistakes here get buried and are expensive to fix later. Pay attention before concrete is poured.
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