TroubleshootingUpdated June 23, 2026
Many Oak Lawn homes, especially those built in the 1950s through the 1970s, have original cast iron or galvanized steel plumbing tucked behind tile and plaster. When homeowners decide to swap out an outdated tub for a modern walk-in shower, the process usually reveals a lot more than dated fixtures. Plumbing upgrades can get complicated, especially with older supply lines, hard-to-access drain pipes, and local building codes. Our crew has spent plenty of time troubleshooting these jobs and knows where the biggest headaches tend to pop up.
Why Older Oak Lawn Homes Struggle with Remodels
Many houses in this area have decades-old supply and drain lines. Galvanized steel and cast iron drain pipes are common, and those materials corrode over time. Add in the heavy clay soil and flat terrain in Oak Lawn, and you get slow drainage, standing water in traps, and sometimes musty odors backing up into the bathroom. The humid summers and freezing winters don't help either, since both temperature swings and shifting soil can stress pipes, especially around the shower's new drain connection.
Common Plumbing Issues in Tub-to-Shower Conversions
Our plumbers see a few trouble spots pop up again and again:
- Improper Drain Size: Shower drains need a full 2-inch line by Illinois plumbing code, while old tubs often have only 1.5-inch drains. This means upsizing the pipe and tying into the branch properly, or you'll face slow draining and backups.
- Deteriorated Pipes: Removing a cast iron tub often exposes fragile old pipes or fittings. It's not unusual to find rusted galvanized or cracked cast iron that needs repair before installing a new shower.
- P-Trap Problems: A tub's trap is often deeper in the floor than a shower needs. If not relocated correctly, the trap may dry out or leak.
- Waterproofing Errors: A walk-in shower has less height to contain splashes, so pan liners, curb height, and proper drain assembly matter more to keep water from leaking into ceilings or adjoining rooms.
- Supply Line Layout: Older bathrooms tend to have rerouted or oddly sized hot and cold supply lines. If you want new controls or a rainfall shower, you may need to upgrade those lines to copper or PEX for stable pressure.
Steps to a Trouble-Free Tub-to-Shower Project
In Oak Lawn, our team tends to approach these jobs with a few key steps in mind. Skipping any of these often leads to future headaches:
- Inspection: We examine all visible supply lines and drain pipes. If there's old galvanized or cast iron, we recommend a replacement section now, not later.
- Main Shutoff Check: Many homes have old, stubborn shutoff valves. We make sure the water can be turned off easily before any demolition begins. If the valve is stuck or corroded, it's safer to update it.
- Ventilation: Shower conversions sometimes block or disrupt vent lines hidden in the wall. We track these carefully to avoid slow drains and sewer odors. Sometimes this means adjusting connections or running new vent piping up through the roof.
- Pan and Curb Installation: Proper sloping on the shower pan and a leak-tested liner are essential, especially in clay soil areas where leaks travel quickly along the slab or into the basement. We water test every pan before finishing surfaces go in.
- Fixture Upgrades: New showers are a good time to update your mixing valve and handles. We often tie in new anti-scald valves for both comfort and code compliance. If you need new faucets or showerheads, our faucet and fixture installation crew handles the whole process.
Drainage and Backup Warnings in Local Homes
Another frequent Oak Lawn headache is slow drainage after a remodel. Flat terrain and older homes set up for tubs mean the drain slope isn't always ideal for showers. We recommend you watch out for these warning signs:
- Standing water after the shower drains
- Gurgling or bubbling noises from the new drain
- Water seeping out along the base of the new shower
- Musty or sewer odors shortly after using the shower
If you run into these, you may need a proper camera inspection of drain lines or a professional drain cleaning to remove old soap, rust, or even tree roots working their way into clay pipes. Major sewer problems sometimes show up after bathroom remodels, especially if original clay-tile lines are disturbed. Our sewer line services team handles these in Oak Lawn regularly.
Avoiding Leaks and Water Damage
Because much of Oak Lawn sits on heavy clay soil with a high water table, leaks can quickly find their way into basements or finished lower levels. Any time you work on a bathroom, you need to keep an eye out for:
- Poorly sealed pan liners or curbs
- Weak joints where the shower base meets the wall
- Pinhole leaks in newly soldered copper supply lines
- Old or makeshift shutoffs that drip behind the walls
We always run full water tests and double check for hidden leaks before closing up walls or laying tile. If leaks do show up after your remodel, our leak detection and repair team can trace the source so you don't end up with wall or ceiling damage months later. For homes with regular basement flooding issues, it's worth looking into sump pump services to keep extra water out of the lower level during heavy storms.
When Repiping Makes Sense
Sometimes what starts as a bathroom upgrade turns into a bigger repiping job, especially in homes with half-century-old galvanized or cast iron lines. If your new shower is only as reliable as the pipes feeding it, a partial or full pipe repair and repiping might be smart in older Oak Lawn houses. This gives you more consistent pressure, better temperature control, and fewer future leaks or clogs.
If you're ready to move your bathroom from "dated" to "modern," our team is here to help with every step of your Oak Lawn tub to walk-in shower remodel. Call us at 708-634-5773 to schedule an inspection or talk through your plans with an experienced local plumber.