Toilet repair and installation

A toilet that runs

The most common call, the cheapest to fix, and quietly one of the most expensive faults to ignore. A continuously running toilet can waste enough water in a month to be visible on a bill.

Flapper. The rubber seal at the bottom of the tank. Rubber hardens and warps with age and with chlorine, stops sealing, and water creeps past into the bowl. The tank drops, the fill valve tops it up, and you hear the cycle every twenty minutes. The single most common cause and a very cheap part.

Flapper chain. Too short and it holds the flapper open a fraction. Too long and it tangles under the flapper. Free to fix and worth checking before buying anything.

Fill valve. If water is running into the overflow tube, the fill valve is not shutting off or the level is set too high. Adjust the level first; if it still runs, the valve is done. Also a cheap part.

Float set wrong. Water level should sit about an inch below the top of the overflow tube. Higher and it simply drains away continuously.

Cracked overflow tube or a tank crack below the water line. Less common, and it means a new tank or a new toilet.

The dye test. Food colouring in the tank, wait twenty minutes without flushing. Colour in the bowl means the flapper is passing. It settles the question in a way listening does not.

Weak, slow or incomplete flush

Water level too low in the tank. A flush is powered by the volume dropping from tank to bowl. Set an inch below the overflow.

Flapper closing too early. A flapper that drops before the tank empties cuts the flush short. Adjustable models exist; sometimes the chain is the culprit.

Blocked rim jets. The small holes under the rim distribute water round the bowl, and in hard Texas water they scale over. A toilet that flushes weakly and leaves the bowl streaked usually has blocked jets. Clearing them with a wire and a descaler restores a surprising amount of performance.

Blocked siphon jet. The larger hole at the bottom of the bowl that drives the siphon. Scale here has a big effect.

A partial blockage downstream. If more than one fixture is slow, or if the toilet gurgles when the bath drains, the problem is in the drain rather than the toilet.

Venting. A blocked vent stack starves the drain of air. Symptoms are a slow gulping flush and bubbling at other fixtures.

An early low-flow model. First-generation 1.6-gallon toilets from the 1990s were genuinely poor. No repair fixes the design, and replacement with a modern high-performance unit is a real improvement rather than a sales line.

Water on the floor: where it is coming from matters

Diagnosis before panic. Dry everything, put down paper towel, and find the source.

Condensation. In a Texas summer, a cold tank in a humid bathroom sweats, and the drips land at the base. Looks exactly like a leak. Warmer tank water, a tank liner or better ventilation are the answers.

Tank-to-bowl bolts or gasket. Water appearing between tank and bowl. A gasket and bolt kit, and a straightforward repair.

Supply line or stop valve. A weep at the connection or a failing packing nut. Cheap and quick.

The wax ring. Water appearing at the base only when flushed, or a persistent smell. The wax seal between toilet and flange has failed. Requires pulling the toilet, and while it is up the flange gets inspected.

The flange. Cracked, broken, or set below finished floor level after tile was added. This is the underlying cause of a great many repeat wax ring failures. The ring is being asked to bridge a gap it was never designed to bridge. Repair rings and extension kits fix it properly.

The floor itself. If the subfloor around the flange is soft, that is a longer conversation. Water has been getting out for a while, and setting a new toilet on a compromised floor solves nothing.

Rocking, loose and smelling

A rocking toilet is not cosmetic. Every movement works the wax seal, and a seal that has been flexed for months is a seal that is leaking, whether you can see it or not.

Loose closet bolts are the first check. Snug them gently and alternately, over-tightening cracks porcelain, and that turns a two-minute fix into a new toilet.

An uneven floor under the base. Shims and a bead of sealant around the front and sides is the correct fix. Leave the back open deliberately so a future leak can escape and be seen rather than sitting hidden under the base.

A broken flange. If the bolts pull up or spin, the flange ears have broken. It has to be repaired properly; nothing else will hold.

A persistent sewer smell with no visible water is a failed wax seal letting gas past. It does not need to leak water to leak air.

Soft flooring around the base means it has been leaking long enough to reach the subfloor. Pull, inspect, repair the floor, then reset. Anything less is cosmetic.

When to replace instead

Cracked porcelain. Any crack in the bowl or below the tank water line. There is no repair, and epoxy on a fixture that holds water and takes weight is not one either.

An early low-flow model that has never worked properly. Two decades of plunging is enough.

Repeated repairs on an old unit. When flapper, fill valve, tank gasket and rim jets have all been addressed, the parts have exceeded the value of the fixture.

Comfort height. Two inches taller than standard, and for older householders or anyone with knee or hip problems it is a genuine daily improvement rather than an upsell.

Rough-in check before buying. Measure from the finished wall to the centre of the closet bolts: 12 inches is standard, 10 and 14 exist in older houses. Buying the wrong rough-in is the most common self-purchase mistake.

What a proper installation includes: old unit removed and disposed of, flange inspected and repaired if needed, new wax ring or modern seal, new closet bolts, new supply line, level and shimmed, sealed at the base, and tested through several flushes.

Skirted and one-piece models are easier to clean and cost more to install, since some need a special mounting bracket. Worth knowing before choosing on looks alone.