Why stacks clog from the bottom up, how one unit floods another, and the maintenance interval that protects NOI.
In multi-family buildings, every unit's fixtures feed vertical stacks that combine into horizontal building drains — meaning one line's blockage becomes several households' emergency, and always at the lowest connected unit first. The physics is unforgiving: when the building drain restricts, upper floors keep flushing and the ground-floor or basement unit receives the result.
Kitchen stacks lining with decades of multi-unit grease; bathroom stacks accumulating scale and biofilm; horizontal building drains collecting everything the stacks deliver plus root intrusion where they exit the foundation. Symptoms escalate floor by floor: gurgling low units, then slow drainage, then the backup — usually into the unit whose tenant is least responsible for the cause.
Kitchen stacks in occupied buildings: jetting every 12–24 months depending on unit count and history. Building drains and house traps: annual cleaning with camera checks on lines with defects. New-to-you buildings: a full camera survey during due diligence — a building's drain condition is invisible in the offering memo and expensive in year two.
One backup event in an occupied lower unit — emergency service, mitigation, tenant displacement or rent credit, and the reputational tax of the review that follows — routinely exceeds five years of scheduled stack maintenance for that riser. Preventive drain care is one of the few line items in property management with that clean a payback story, and documented service records add value at refinance and sale.
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