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Foundation drain (drain tile)
A foundation drain is a perforated pipe around the foundation that collects groundwater and carries it away.
Why it matters
It reduces water pressure around the foundation and helps keep basements dry.
Where people get this wrong
A drain needs a place to send water, like daylight or a sump pump. Drains can clog if installed without the right gravel and fabric.
Real-world example
A basement stays dry for years, then one wet spring it leaks. A clogged or missing foundation drain can be the reason water pressure finally wins.
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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