Introduction

Removing a cast iron tub can be a daunting task, but with the right planning and tools it can be accomplished. Cast iron tubs are extremely heavy, with some weighing over 500 pounds, so this project will require a few strong helpers. The good news is that cast iron tubs can typically be removed in one intact piece with some strategic maneuvering. Follow these steps for a successful cast iron tub removal.

Assess the Cast Iron Tub Installation

The first step is to understand how your tub was installed originally. This will allow you to plan how to remove it safely and efficiently.

Determine if it is a drop-in or undermount tub. Drop-in tubs sit on a ledge in the framing and are lowered in from above. Undermount tubs sit on the subfloor.
Check if it is surrounded by tile, which will need to be removed first. Examine the joints and grout lines carefully.
Look underneath to see if it sits on a mortar bed. You may need to break this up first.
See if the drain is ABS or cast iron. ABS can be cut, cast iron will need to be unscrewed.
Check how it is attached and supported. Bolts, ledgers, or other brackets will need removing.

Thoroughly examining the tub installation will prep you for each step of the process.

Gather the Necessary Materials and Tools

Removing a cast iron tub is strenuous work, so having the right equipment makes the job much easier. Here are the typical supplies needed:

Pry bar – A sturdy, long pry bar is essential for leverage when freeing the tub. An 18″ to 24″ size is ideal.
Sledgehammer – A 10-pound sledgehammer can help break a mortar bed or tile adhesive. Use quick, controlled strikes.
Reciprocating saw – For cutting through drain pipes, brackets, etc. Use a metal cutting blade.
Channel lock pliers – For removing drain pieces and disconnecting supply lines.
Gloves – Leather work gloves protect hands from sharp metal edges.
Eye protection – Safety glasses or goggles in case of debris.
Dust mask – For protection from mortar, grout, or cast iron dust.
Flat pry bar – For prying between tub and wall to break adhesive/grout seal.
Wheel dolly – For moving the tub. Choose one rated for heavy loads.
Lifting straps – Nylon straps to aid in hoisting tub out once freed.

Gather all equipment and safety gear ahead of time so it’s readily available during the removal process.

Protect Surrounding Surfaces

Since the tub removal process can be messy, it’s wise to cover nearby surfaces for protection.

Lay a tarp or plastic sheeting on the floor around the tub to catch debris.
Protect walls by taping up plastic sheeting if demolishing tile.
Detach shower doors and glass partitions and move aside.
Have drop cloths ready to cover the empty tub hole after removal.

Taking these steps prevents damage and makes for an easier cleanup later.

Prepare the Tub Area for Removal

With your supplies gathered and the area protected, now you can start dismantling in preparation for pulling out the tub.

If Tub is Tiled In:

Score grout lines with a utility knife. This allows the tiles to break cleanly.
Use a sledgehammer and cold chisel to carefully knock tiles off starting at the top. Wear eye protection.
Alternatively, you can rent a power tile scraper for large areas. Work cautiously.
Check for wire lath behind tiles and cut/pull out as needed with pliers.
Once tiles are removed, chisel out remaining thinset mortar bed.

If Tub Has No Tile:

Carefully pry tub away from all walls using a flat pry bar. This breaks the tub sealant.
Pre-cut any caulk beads along the rim with a utility knife.

For All Tubs:

Turn off water supply valves and drain the lines.
Disconnect supply lines and remove tub spout diverter.
Unscrew drain pieces with channel lock pliers. Saw the tailpiece off if needed.
Detach any small side brackets or cleats.

The tub should now be ready to be shifted free of its setting.

Dislodge Tub from Setting Bed

With tiles or sealant removed, the tub should be loose on most sides. But a mortar bed often remains stuck to the bottom.

Check under tub for a concrete-like bed. Chip away small sections with a hammer and chisel.
Once you can see bottom, slide pry bar under tub edge and pry upwards to crack bed.
Work a pry bar around entire tub bottom, lifting and cracking as you go.
Use a hammer or mallet to tap the pry bar further under the tub lip to increase leverage.
If needed, use a reciprocating saw to cut through any remaining ledger boards.
Keep prying upwards until the tub releases from the mortar base.

Applying force at the tub bottom edges will break it free for removal.

Remove the Freed Cast Iron Tub

Now that the tub should be detached on all sides, it’s time to finagle it out. This requires coordination and good communication.

Have at least 2-3 able helpers. Assign roles – braces tub, guides tub, clears debris, etc.
Attach nylon lifting straps under each end and prepare to hoist up.
Tilt tub to slide one end out several inches. Then work the other end out.
Once one person can hold their end out, the other raises their end up and out.
Carefully shuffle sideways to fit length through doorway as needed.
Use an appliance dolly if space allows to wheel it out on its side.
Lower tub gently onto a blanket or tarp for transport.

Teamwork is key for a safe and controlled removal. Call on help from strong friends or professionals if needed.

Dispose of the Old Cast Iron Tub Properly

That iron tub was heavy to remove, and it’s just as heavy to haul away. Follow these guidelines for proper disposal:

Rent a pickup truck if you don’t own one. Transport laying flat covered in tarp.
Look for scrap metal recycling centers near you. Call ahead and ask if they accept tubs.
Junk removal services may charge a fee for tub disposal since it’s so heavy.
Some municipalities allow large metal items like tubs to be left at the curb on trash day. Check first.
As a last resort, cast iron can go to a construction debris landfill. There may be a minimal fee.
Break off any remaining tile and mortar before recycling or disposal.

Removing the old tub is satisfying, but don’t let it sit around too long before trashing it.

How to Remove a Cast Iron Tub – FAQs

Below are some frequently asked questions about removing a cast iron bathtub:

How do I remove a cast iron tub that is mortared in?

If the tub has a mortar bed securing it, you’ll need to break up the mortar before attempting to dislodge the tub. Use a hammer and chisel to chip away the mortar underneath the tub. Slide a pry bar under the edges and pry upwards to crack the mortar. Keep working around the entire tub, lifting and cracking the mortar base until the tub is fully released.

What tools do I need to remove a cast iron tub?

You’ll need a pry bar, sledgehammer, reciprocating saw, channel lock pliers, work gloves, eye protection, dust mask, flat pry bar, and nylon lifting straps. Having an appliance dolly is also extremely helpful for maneuvering the tub out once freed.

How do I cut the drain pipe on a cast iron tub?

Use a reciprocating saw with a metal cutting blade to cut through the drain pipe and tailpiece. Try to saw as close to the tub as possible for easier removal. ABS plastic drains can also be cut this way. For cast iron drains that you want to preserve, unscrew the pieces with channel locks instead.

How much does it cost to remove a cast iron tub?

If hiring a plumber, costs typically range from $200-$500. The rate depends on access to the tub, demolitions needed, and disposal fees. DIY removal only requires renting a heavy-duty dolly and buying/renting tools, so just $100-$300 total.

How heavy is a cast iron tub?

Cast iron bathtubs weigh between 200-500 lbs typically. Clawfoot tubs on the lighter end, whereas built-in tubs can exceed 500 lbs. Have at least 2-3 strong people to help remove it safely.

Should I demolish tile before removing an old tub?

Yes, remove any surrounding tile first. Score grout lines with a knife then chisel off tiles. This prevents tiles from falling later and makes shifting the tub easier. Cut away any wire lath behind tiles as well.

What is the best way to demolish the mortar bed under a tub?

Use a cold chisel and hammer to chip away small sections first so you can see underneath. Then take a pry bar and slide it under the tub lip, prying upwards to crack the mortar. Keep working around the entire tub, lifting upwards until the mortar gives way.

Can I put a cast iron tub out on the curb for trash pickup?

Some municipalities will take large metal items like tubs on regular trash day. However, most require you to bring cast iron tubs to a recycling center or landfill yourself. Contact your local waste authority to check requirements.

How to Remove a Cast Iron Tub – Conclusion

Removing an old cast iron bathtub takes muscle, determination, and the right techniques. But with thorough planning and preparation, you can demolish and extract it successfully as a DIY project. Always take care to protect yourself and your helpers by using caution, safety gear, and proper form when prying and lifting.

The sense of accomplishment after hauling that several-hundred-pound tub out in one piece is worth all the hard work. Just be sure to properly dispose of the tub once it’s out. With some perseverance and teamwork, you’ll have that cast iron monster removed and ready for its replacement in no time!