Slab leak check before buying a Florida home

Why buyers ask about slabs

Most Florida homes are built on a slab, with supply lines under or in it. Leaks there are hidden, and a general inspection does not always test for them. Older homes may also have pipe types that are worth knowing about.

A check does not guarantee the future. It reports on the home as it is on the day.

Signs worth noting at a viewing

Warm patches on a tile floor, darkened grout, lifting tile, damp baseboards, a musty smell in one room and sounds of running water when everything is off.

See damp baseboards and lifting tile and warm spot on a tile floor. None proves a leak, but each is a reason to ask.

A buyer's checklist

Use this during or after a viewing.

Pipe type and building era

The age of the home hints at the plumbing. Homes of the polybutylene era may have that pipe. See polybutylene era homes. Newer homes often use PEX. See PEX slab leaks. Many others use copper. See copper pipe leaks.

Older slabs may also have cast iron or clay drain lines. See under slab drain line leaks.

What a leak check involves

A technician isolates and pressure tests the supply lines, listens across the floor and reads the meter. See how slab leaks are found.

The result is a report of what was found. It may say no sign was detected. That is a snapshot and not a promise.

If something turns up

A finding can be raised with the seller, who may repair, adjust the price or decline. Your agent or attorney guides that. We explain the plumbing side only.

If a leak is found, you can ask for the options and price to take to the negotiation. See repair options compared.

Questions to put to the seller

Has the home had any plumbing leak, and where? Has any line been rerouted or replaced? What pipe is in the walls and under the slab? Have bills ever spiked? Has the home been vacant for long periods? Written answers are better than verbal ones.

If the seller does not know, that is information too. A leak check then carries more weight.

Vacant and seasonal homes

Homes left empty can leak for weeks before anyone notices, and a closed home hides the sound and the bill. If the home has been vacant, ask how long, whether the main was off and whether anyone checked it. See before you leave leak checklist.

A leak check is especially worth considering for vacant homes, because the signs are easy to miss at a short viewing.

After you move in

Take a meter reading on day one with everything off, and again after an hour. Note where the main valve is and test that it turns. Keep the leak check report with your closing papers.

A baseline reading makes any later change easy to spot. See water meter leak check.

Timing and access

Arrange the visit early in the inspection window. The seller must allow access and water on. Seasonal and vacant homes may have been closed up, so ask how long. See seasonal home slab leaks.

Condos need association approval for some work. Ask early.

Fitting the check into the timeline

A slab leak check needs access to the water meter, the main shutoff and the fixtures, so it is easiest when the utilities are on and the home is not packed up. Ask early whether the seller will allow a meter test and a technician visit. Some sellers agree readily, and others need time.

If the home has been vacant, ask how long and whether the water has been running or off. A home with the water off for months tells you little about the lines, and a short pressure test after it is turned on can add useful information.

Reading what the technician tells you

A report from a leak check should say what was tested, what the result was and what could not be tested. A line that held pressure is a good sign about that line on that day. It does not promise the future, and it does not describe lines that were not tested.

If a leak is found, ask for its location, the likely options and what steers the choice. You can then discuss it with the seller from a position of facts instead of guesses.

Matching the questions to the home

A 1970s house with original copper raises different questions from a 2015 build with PEX. For an older home, ask whether any lines have been rerouted or replaced and when. For a newer one, ask about the fittings and any earlier repairs.

Condos add their own questions. Ask the manager whether there have been leaks in the unit or the units around it, and where the shutoffs are. A ground-floor unit sits on the slab, so the same checks apply.

Your first month in the house

Take a meter reading on the day you get the keys, with every fixture off. Repeat it a week later. A steady dial is a reassuring baseline, and a moving one is worth a call while the sale is still fresh.

Learn where the main shutoff is and make sure it turns. Keep any report from the check with your closing papers. It will help you or the next owner.

Talking with the seller

Ask politely and early whether the seller has had any leaks, where they were and who repaired them. Sellers often know more than a listing says, and a plain question usually gets a plain answer. Write down what you are told and the date you were told it.

If the seller agrees to a meter test, ask for the home to be in its normal state: fixtures off, irrigation off and any softener or auto-fill paused. The cleaner the test, the more it tells you. If the answer is no, you can still check the meter at a second viewing and note the dial.

A technician can then walk through the home with you, explain what the sound or the floor temperature suggests, and say plainly what could and could not be checked in the time available.

Whatever the answers, keep your notes from the viewing, the seller's replies and any meter reading together. They make later conversations simpler for you and for anyone advising you.