Replacing Grout in Shower: A Step-by-Step Guide
Learn how to replace grout in a shower with a clear, practical plan. From damage assessment to sealing, follow expert guidance to restore waterproofing and keep tiles looking fresh.
Replacing grout in shower is a practical project that restores waterproofing and appearance. This guide summarizes the essential steps: assess damage, remove old grout, clean joints, apply new grout, cure properly, and seal. You’ll need basic tools, a grout float, and a grout sealer. Follow these steps carefully to avoid damaging tiles or backing material.
What replacing grout in shower achieves
Replacing grout in shower is more than a cosmetic update. Over time, grout can crumble, harbor mold, and allow water to seep behind tiles. The result is not just a dull shower appearance, but potential substrate damage, tile loosening, and higher maintenance costs. By replacing grout in shower, you restore the protective grout joints that keep moisture out, improve hygiene, and refresh the overall look of your tile work. According to Grout Maintenance, a thoughtful grout replacement can significantly extend tile life when paired with proper sealing and routine care. When done correctly, this project reduces mold growth, minimizes water intrusion, and simplifies future cleaning. That said, wrong grout choice or poor technique can trap moisture or crack easily, so planning is essential. The goal is a uniform joint that matches tile size, color, and the shower’s exposure to water. Plan for ventilation during work and a full cure period before using the shower again. In short, replacing grout in shower is a practical upgrade that protects your investment and improves daily comfort.
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Tools & Materials
- Grout removal tool / grout saw(Manual or oscillating tool with carbide blades; used to clear old grout from joints.)
- Utility knife(Cuts away soft cementitious grout near tile edges.)
- Vacuum or brush(Clean debris and dust from joints before applying new grout.)
- Bucket and clean water(Rinse joints and rinse sponge during cleanup.)
- Grout float(Press new grout into joints at a shallow angle for even fill.)
- Mixing container and paddle(Prepare grout according to product instructions.)
- Grout (cementitious or epoxy)(Choose based on shower usage and maintenance needs.)
- Sealer (breathable for cementitious; optional for epoxy)(Seal after curing to protect against moisture and staining.)
- Sponge and clean water for haze removal(Wipe surfaces to remove grout haze as it cures.)
- Gloves, eye protection, and a mask(Protect skin and eyes from dust and chemical fumes.)
- Tile cleaner or degreaser(Use on highly soiled joints before starting.)
Steps
Estimated time: 2.5-4 hours
- 1
Inspect and prep the shower
Begin by examining all grout lines for loose tiles, cracks, or deep staining. Remove loose grout with a grout saw and clear debris from joints. Protect surrounding surfaces and ensure good ventilation; this sets the foundation for a clean, lasting repair.
Tip: Take photos of damaged areas for reference and mark high-priority joints to prevent missing them later. - 2
Remove damaged grout
Carefully gouge out the compromised grout, staying within the joint depth. Do not gouge the tile edge or backing material. For stubborn areas, switch to a carbide bit on a Dremel or oscillating tool, but keep penetration shallow.
Tip: Work in small sections to avoid creating divots that later show through the new grout. - 3
Clean and dry the joints
Vacuum or brush away remaining dust, then wipe with a damp sponge. Allow joints to dry completely—this may take several hours depending on humidity and temperature. Moisture trapped in the joints will compromise grout adhesion.
Tip: A quick blow with a hair dryer on cool setting can speed up drying in damp spaces. - 4
Mix the new grout
Prepare grout per manufacturer’s instructions, achieving a consistent, peanut-butter-like texture. For epoxy grout, use the exact resin and hardener ratio and mix thoroughly to avoid tint differences. small batches are easier to manage during application.
Tip: Never add extra water to epoxy grout; this weakens its performance and longevity. - 5
Apply grout into the joints
Using the grout float, press grout into joints with a firm, diagonal motion to ensure complete filling. Remove excess grout from tile faces as you work—especially around corner joints—to minimize haze later.
Tip: Hold the float at a 45-degree angle and work in small vertical or horizontal swaths to improve consistency. - 6
Clean and buff the grout haze
After initial set (as recommended by the grout brand), wipe tile surfaces with a damp sponge to remove remaining grout haze. Rinse sponge frequently and avoid dragging grout across tile surfaces. Allow grout to cure undisturbed.
Tip: Do not rush this step; improper cleaning leaves a persistent residue that’s hard to remove later. - 7
Cure, seal, and maintain
Let grout cure fully according to product guidelines, typically 24–72 hours for cementitious grout and longer for epoxy-based products in humid showers. Apply a sealer if using cementitious grout once cure is complete. Regular maintenance includes gentle cleaning and periodic resealing.
Tip: Use a breathable sealer to prevent moisture buildup behind tiles; never seal epoxy grout.
Got Questions?
Is replacing grout in a shower a DIY-friendly task?
Yes, with careful planning and the right tools, a DIY grout replacement can be manageable. Expect some dust and humidity, and follow product instructions closely. If you encounter loose tiles or extensive waterproofing concerns, consider professional help.
Yes, you can DIY grout replacement, but watch for loose tiles and water damage; follow product instructions for best results.
How long should grout cure before using the shower?
Cementitious grout typically cures in 24–72 hours, depending on humidity and temperature. Epoxy grout may cure faster but requires strict mixing and curing conditions. Always follow the manufacturer’s guidelines.
Cementitious grout usually cures in about 1 to 3 days; epoxy grout cures under its own guidelines—check the product label.
Epoxy grout or cementitious grout for showers?
Epoxy grout is more resistant to stains and moisture, making it a strong choice for showers. Cementitious grout is easier to work with and more forgiving for beginners but may require sealing and more maintenance.
Epoxy grout lasts longer in wet areas, but cementitious grout is easier to work with and seals can help.
Do I need to remove all old grout or just the damaged portions?
For best results, remove all compromised grout to create clean, uniform joints. Partial removal can leave weak points and may compromise waterproofing.
Usually, remove all damaged grout and nearby compromised areas to ensure a solid repair.
How can I prevent future mold after grout replacement?
Choose grout appropriate for wet areas (epoxy or sealed cementitious) and ensure complete drying between steps. Regular cleaning with mild cleaners and timely resealing helps prevent mold growth.
Use a grout suited for showers, dry joints thoroughly, and maintain with regular cleaning.
Can I regrout over existing grout?
You can often remove the top layer and apply new grout to freshen the appearance, but if the old grout is cracked or degraded, full removal is typically best for long-term results.
Often you should remove the old grout fully if it’s cracked or degraded; partial regrouting can leave problems behind.
The Essentials
- Inspect thoroughly and plan the grout type before starting.
- Remove damaged grout completely for a lasting repair.
- Mix and apply grout with clean, consistent technique.
- Seal if using cementitious grout to protect against moisture.
- Cure properly and maintain to extend tile life.
