TroubleshootingUpdated June 15, 2026
Many homes in Glendale Heights were built between the 1960s and 1980s, and plenty of those bathrooms still have a builder-grade tub that no one uses. Swapping that tub for a walk-in shower is one of the most requested changes we see, especially as accessibility and low-maintenance living become bigger priorities. But turning a bathtub into a shower isn't as easy as swapping fixtures. Between aging pipes, local soil conditions, and the way older homes were built, there's a lot that can go wrong if the job isn't handled right.
Common Plumbing Hurdles in Local Homes
Glendale Heights homes often have original plumbing hiding behind bathroom walls. It's common to find galvanized steel or cast iron drains, especially in homes over 40 years old. Both materials tend to corrode or clog over time, which becomes an issue when changing over to a new shower setup. Modern showers drain faster, and that extra flow can overwhelm an old 1.5-inch tub drain or expose weak points in aging pipes.
On top of that, our moderately hard Lake Michigan water leaves mineral deposits inside supply lines and fixtures, making old valves sticky or hard to shut off during the remodel. We often recommend a thorough inspection before even pulling out the old tub. Upgrading to PVC or ABS for the new shower drain and swapping any visible galvanized piping for copper or PEX gives a much smoother result and helps avoid leaks or slow drains down the line.
What to Check Before Removing the Tub
- Main shutoff location: Know where your home's main water shut-off is, since some older shutoffs near the meter can be stuck or leak.
- Subfloor condition: Tubs often hide water damage, especially if the old caulking failed. Soft or rotting subfloors need repair before installing a new shower base.
- Drain size and slope: Code requires at least a 2-inch drain for new showers. Many tubs are only 1.5-inch. Converting the line might mean breaking up some concrete, especially in slab-on-grade homes.
- Vent placement: Tub vents aren't always right for a shower, and poor venting leads to gurgling drains or slow flow. We often connect the shower drain to a nearby vent stack, or install an air admittance valve if allowed by local code.
- Water supply lines: Look for old shutoff valves and corroded supplies. Replacing these at the same time saves headaches.
Our team checks all these before we start. It limits surprises and helps the project move faster once demolition begins. We've seen too many projects stall because of an overlooked patch of rot or a stuck main shutoff.
Dealing With Clay-Rich Soils and Water Table Issues
Many Glendale Heights homes are built on flat, clay-heavy lots. That impacts plumbing in bathrooms, especially on first floors or slab foundations. Clay soil drains slowly, so if any part of the old or new drain isn't properly sealed, water can work its way into the subfloor or foundation. This is also a concern for homes with a crawl space or basement, where even tiny leaks add to moist conditions or sump pump load.
If you notice puddling below the old tub, or if the walls show mold or peeling paint, that's a red flag for hidden leaks. We often recommend pairing a conversion with leak detection and repair to catch any small issues before they become costly. For basement bathrooms or those with low spots, proper sump pump function and good drain routing help keep moisture problems in check.
Fixture and Drain Selection for Walk-In Showers
Walk-in showers put different demands on your plumbing than a tub. The shower base has to slope the right way so water moves toward the drain, and the drain itself needs a reliable trap (usually a P-trap) to block sewer gases. Code now wants most new showers to have a 2-inch drain. In older homes, the original tub line may be smaller, so we often have to upsize the drain and connect it to a main soil stack. That sometimes involves running new pipe under the floor or slab, especially in homes with bathrooms on the first level.
For supply lines, replacing any old shutoff valves and using new braided stainless steel connectors makes future maintenance easier. If the old tub filler was a wall-mount, we usually need to move water lines up for a new mixing valve and showerhead. We handle all fixture installation or can coordinate with your chosen tile or glass contractor for a smooth finish. For those swapping out other bathroom fixtures, we offer fixture installation services as part of a larger remodel.
Preventing Common Issues After the Conversion
Once the new shower is in, it's important to keep an eye on a few key trouble spots. Shower drains can clog with hair or soap scum, especially in homes where the new line runs a long distance or makes several turns. A routine drain cleaning can help keep water flowing.
Another problem is water temperature fluctuations, which are more noticeable in older homes with aging water heaters or old supply lines. We often combine bathroom work with water heater maintenance, especially if you're adding high-flow fixtures or want consistent hot showers.
If you notice slow drains, gurgling sounds, or water pooling outside the new shower pan, those are signs of a problem in the drain or vent system. Mold or soft spots around the new shower base mean you should call a licensed plumber for an inspection. These issues don't resolve themselves, and catching them early saves time and money.
Summary Steps for a Smooth Tub-to-Shower Conversion
- Inspect and map out existing plumbing and fixtures first.
- Upgrade old galvanized, cast iron, or corroded pipes and shutoffs.
- Upsize the drain to 2 inches and ensure proper venting.
- Check subfloor, especially for water damage under old tubs.
- Seal new shower bases thoroughly to protect against clay soil moisture.
- Maintain your new shower with regular drain cleaning and water heater checks.
Swapping an old tub for a walk-in shower is a solid upgrade, but Glendale Heights homes have quirks that call for experienced plumbing work. Our crew handles everything from the first inspection to the final check. If you're ready to get started or want advice on troubleshooting a bathroom conversion, reach us at 630-381-5438. We help local homeowners avoid headaches and get the result they want.