Valve Off Is Twelve to Three
The clock-face rule for lever valves: off always swings the handle from 12 to 3, so a stuck valve never gets forced the wrong way.
Head Off the Common Plumbing Emergencies in an Afternoon When You Move In
Quarter-turn shut-offs, braided supply lines, a pressure check, a water-heater flush, and knowing where the cleanouts are. Five jobs, half a day, done once.
new homeowner checklist, prevent water damage, shut off valve stuck, toilet supply line leaking
The Problem
Most plumbing emergencies are not sudden. They're an old part that was always going to fail, discovered at the worst moment — usually when you need a shut-off valve that hasn't been turned in fifteen years and won't turn now.
Moving in is the one time you have access to everything, no furniture in the way, and a reason to look. A plumber's own answer to what he did before unpacking is a decent list of what's worth doing once.
The Technique
1. Replace every shut-off valve with quarter-turn stops. Older multi-turn stops use a rubber washer that hardens in place. Left untouched for years, they seize, or they turn and then won't seal, or the stem packing weeps once disturbed. A quarter-turn ball valve either works or it doesn't, and it works after a decade of not being touched. These are the valves you'll want in an emergency, which is precisely when a seized one is worst.
2. Replace supply lines with braided stainless hoses. The plastic and older rubber supply lines under sinks and behind toilets are a common flood source — they fail with no warning and at full pressure. Braided stainless lines are a few pounds each. Do the toilets, the basins and the washing machine.
3. Check the water pressure, and fit a regulator if it's high. High incoming pressure damages everything downstream without producing a symptom you would notice — it's what turns a marginal supply line or valve into a burst one, and it shortens the life of every appliance with a fill valve. A gauge that screws onto an outside tap costs very little. If it reads high, a pressure-reducing valve is the fix, and that one is worth a plumber.
4. Flush the water heater. Sediment settles in the bottom of a tank, insulating the burner or element from the water above it. That costs efficiency, causes the rumbling noise old heaters make, and shortens the tank's life.
5. Find every cleanout. Locate and mark the drain cleanouts, inside and in the yard. This one does nothing until the day it does everything: a blocked main line at 9pm is a different problem depending on whether you can tell someone where the cleanout is, or you're both looking for it in the dark with a torch.
Pro tip: Do this in the order above and the list mostly pays for itself in access. The valves and supply lines are the same trip under each sink, and having just replaced the stop is what makes the rest of that fixture's work easy for the next decade.
Safety note: Know where the main shut-off is before starting any of it, and check that it actually closes. Replacing a seized fixture stop is a small job with the main working and a flood without it. Flushing a water heater involves scalding water — run it to a drain through a hose rather than a bucket, and let the tank cool first if you can.
Electrical, plumbing, and structural work may be regulated where you live — check local code before you start, and note that a permit may be required. More in our disclaimer.
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