Basement backups
Lower fixtures flooding when upstairs runs. Main line or venting, never a guess.
Scarborough
Scarborough runs on postwar bungalows, and a lot of them have two households in them
Streets of nineteen-fifties and sixties bungalows, a great many with a second household living downstairs. That single fact — two kitchens, two bathrooms, two laundries on drainage designed for one family — explains most of what we get called about here.
Drainage built for one house, used by two
A postwar Scarborough bungalow was plumbed for a single family: one kitchen, one bathroom, one laundry. Add a basement apartment and you have roughly doubled the demand on drain and vent pipework that has not changed since the fifties.
The symptom is nearly always the same and it is worth recognising: the basement fixtures back up when the upstairs ones are used. Someone showers on the main floor and the basement shower gurgles or fills. That is not a coincidence and it is not a clog in the basement — it is everything from upstairs meeting a restriction on the way out, and the lowest opening on the line is where it appears.
Sometimes that is a blockage in the main line. Sometimes it is a venting problem, because the second kitchen or bathroom was added without a proper vent and the system pulls air through the nearest trap instead. The two need completely different fixes, which is why we look rather than guess.
Cast iron at seventy years old
Bungalows of this era have cast iron waste stacks, and cast iron does not fail suddenly. It scales up internally, narrowing the bore and catching everything that passes, then eventually cracks at the base where it has been wet longest. Slow drains on both floors at once usually means the stack rather than the fixtures.
Whether it needs replacing depends on its condition, not its age. Plenty of seventy-year-old cast iron is still doing its job. Some of it is a shell held together by the scale inside it. We would rather tell you which you have than quote you a replacement on principle.
And the DIY layer
Houses that have been in one family for decades tend to accumulate work done by whoever was available. A laundry tub plumbed in by a previous owner, a basement bathroom added without a permit, a vent that goes nowhere. None of that is unusual and most of it is harmless. What matters is knowing it is there before you build on top of it.
Most requested here
What Scarborough calls us about
Almost all of it traces back to the age of the drainage or the number of households on it.
Cast iron stacks
Assessed on condition. Age alone does not decide whether it needs replacing.
Hot water for two units
One tank serving two households is usually the wrong tank.
Second suite plumbing
Built to satisfy an inspector, not just to function.
Questions
Plumbing in Scarborough
The basement fixtures back up whenever someone showers upstairs. Why?
Because everything from upstairs meets a restriction on the way out, and the lowest opening is where it appears. Two causes: a blockage in the main line, or a venting fault where a basement bathroom was added without a proper vent. Different fixes, so it is worth diagnosing rather than snaking blindly.
How do I know if my cast iron drain stack is failing?
Slow drainage on more than one floor at once is the first sign — the bore is narrowing everywhere rather than blocking in one spot. Rust staining or damp near the basement floor matters more, because cast iron rots from the base up. Flaking that comes away in your fingers means it is thinner than it looks. Age on its own settles nothing.
Can one water heater serve both units in a house with a basement apartment?
It can, but the original tank almost certainly cannot. A unit sized for one family in 1960 will not cover two households showering in the same hour, and somebody always gets the cold end. Options are a larger tank, two tanks, or tankless, depending on where the gas and venting run.
Why does the basement floor drain smell, but only in summer?
The trap has dried out. A floor drain holds a little water that seals sewer gas out of the room, and if nothing runs into it for weeks that water evaporates — faster in warm weather. Pour a bucket down it. If the smell returns quickly, something else is going on.
A previous owner did some of the plumbing themselves. Should I be worried?
Usually not worried, but worth knowing. Owner-added laundry tubs and basement bathrooms are extremely common in long-held houses, and plenty of that work is sound. We check two things: whether new fixtures were properly vented, and whether anything lets waste water back into the supply. Both are fixable.
Nearby
We also cover
One house, two households, one drain?
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