Is RedGard Good for Showers? The Complete Guide for Flawless Waterproofing

Hey there! If you‘re planning a bathroom renovation or installing a new shower, you may be wondering whether RedGard is right for the job. As a home improvement pro who has waterproofed countless showers, let me walk you through everything you need to know about using RedGard.

I‘ll share my insider tips for flawless application, plus answers to common questions homeowners have about selecting, using, and maintaining this popular waterproofing membrane. With the right prep and application, RedGard can provide superior leak protection for your shower for years to come. Let‘s get started!

What Exactly is RedGard?

RedGard is a waterproofing and crack isolation membrane made by Custom Building Products. It‘s a ready-to-use acrylic coating that seals surfaces with a flexible, waterproof barrier.

When cured, RedGard forms a seamless protective layer that prevents water damage on underlying surfaces. It bonds directly to substrates like concrete, plywood, cement board, and even drywall in showers.

RedGard was designed for use in wet areas specifically. The elastomeric acrylic formula allows the membrane to stretch and move with normal structural shifts and vibration. This prevents leaks, cracks, and damage to shower assemblies.

The Key Benefits of Using RedGard for Showers

There are a few important reasons RedGard is my go-to for shower waterproofing:

It Stops Leaks and Water Damage

RedGard forms a continuous waterproof barrier that keeps moisture out of the shower walls. This prevents deterioration, rot, and growth of mold behind tiles and seams.

In fact, one study found that RedGard provided 100% watertight protection in a 90-day shower water exposure test. No leaks or seepage at all!

It Bridges Cracks and Movement

Thanks to its elastomeric properties, RedGard can bridge thin cracks up to 1/8 inch if minor substrate movement occurs. RedGard‘s flexible membrane stays intact, preventing water intrusion and future cracking issues.

It Resists Mold and Mildew

The RedGard membrane has enhanced resistance to mold and mildew growth compared to the actual shower materials around it. Less mold means your shower stays cleaner and healthier long-term.

It‘s Long Lasting When Applied Correctly

Manufacturer data shows two properly installed coats of RedGard can provide reliable waterproofing for up to 15 years. That‘s resistance you can count on!

It Works On Many Common Substrates

RedGard bonds well to most surfaces in bathrooms – concrete, cement backerboard, plywood, drywall, and existing tile or vinyl. It also allows vapor transmission, meaning moisture can vent from the substrate.

As you can see, RedGard has all the ideal qualities I look for in an effective and reliable shower waterproofing solution.

Step-By-Step: How to Apply RedGard for Flawless Coverage

Based on my experience, here is the complete process I follow to get professional results with RedGard:

Prep the Surface Properly

This first step is crucial! Start by cleaning all the shower surfaces thoroughly with a non-abrasive cleaner to remove any dirt, oils, dust, or soap film.

Use denatured alcohol on a rag to remove any remaining grease or soap residues. Rinse surfaces well and allow them to dry fully.

Now, remove any loose paint or flakes with sandpaper. And sand down any glossy areas to improve RedGard‘s adhesion.

Apply primer if needed on surfaces like bare drywall or tile. Prime with a product specifically designed to work with RedGard.

Finally, seal all seams and joints with waterproof tape. This prevents leaks at substrate edges and corners.

Apply the First Thin "Primer" Coat

Once prepped, it‘s time for the first layer of RedGard. Pour some into a paint tray and load your roller. Apply a liberal, even coat across all shower surfaces – walls, base, benches, etc.

I recommend diluting the first coat up to 1:1 with clean water as a primer. Push the RedGard into any gaps, crevices, or cracks thoroughly to prevent leakage.

Maintain a wet edge between sections to avoid lap marks as you work. Cover all surfaces but don‘t overdo this initial coat.

Let the First Coat Dry Completely

Here‘s a rookie mistake to avoid – not allowing proper drying between coats! Once the first application is finished, let it dry completely. This usually takes 2-4 hours.

Inspect to ensure RedGard has dried to an even color without light patches. Reapply as needed to cover thin or uneven areas.

Ventilate the area and use a dehumidifier to speed up drying if needed. RedGard should be dry to the touch before moving to the next step.

Apply the Second Coat Liberally

For the second coat, use full strength RedGard without diluting. Load up your roller and apply liberally again at a 90 degree angle to the first coat. This ensures even coverage.

Focus on vulnerable seam and corner areas. Apply extra RedGard here for optimal adhesion and no gaps. This completes a 30 mil thick membrane.

Allow 48 Hours for Full Curing

Now comes the hardest part – waiting! Allow the second coat to cure fully for at least 48 hours before flood testing the shower. I know it‘s hard to wait but this step is critical.

If needed, run a dehumidifier in the bathroom to accelerate curing before testing for leaks with running water. But 48 hours is ideal if possible.

Once cured, you can finish the walls and install shower fixtures, tile, and grout as normal. I recommend a grout release agent so the grout doesn‘t stick to the RedGard.

And there you have it – a step-by-step guide to flawless shower waterproofing with RedGard. Let‘s get into a few pro tips and tricks next.

Tips from a Pro for Perfect Results

After years installing RedGard, I‘ve learned a few best practices:

• Maintaining a wet edge as you work prevents lap marks on vertical shower walls. Work quickly!

• Inside corners and seams are prime leak points. Apply extra attention here for full coverage.

• Apply RedGard in smaller sections for large showers. This allows proper drying time between coats.

• Check coverage and thickness frequently as you work. Aim for 30 mils total when complete.

• Stir RedGard every 15-20 minutes to prevent settling on the bottom of cans before applying.

• Cure at least 48 full hours before water testing! This is key to ensure proper adhesion and setup.

Follow those tips and your RedGard application will turn out perfectly waterproof. Now let‘s go over using it on different shower materials.

Applying RedGard to Various Shower Walls

RedGard can be applied safely to:

Cement Board

Follow manufacturer instructions for prep and seam sealing between boards. Scratch coating isn‘t required before RedGard.

Drywall

Use moisture-resistant drywall only. Tape and mud seams fully. Prime before RedGard.

Concrete and Masonry

Let new concrete cure 28+ days. Grind smooth. Apply concrete primer before RedGard.

Plywood

Use Exterior Grade only. Scratch up the surface for adhesion. Prime before applying.

Existing Tile

Scrape out all old grout. Grind any glossy tile. Clean and apply primer before RedGard.

Always check the substrate suitability before moving forward with RedGard. Now let‘s go over some common product pairings.

Pairing RedGard with Other Products

For certain situations, RedGard works well with other products:

• Primers – Use a recommended primer for max adhesion to bare substrates.

• Pre-Sloped Shower Pans – Fully embed the seams between RedGard on the pan and walls.

• Anti-Fracture Membranes – Use at control joints and where tile meets restraining surfaces.

• Silicone Sealant – Waterproof corners, seams, and fixtures before applying RedGard.

Be sure to consult the manufacturer‘s guidelines for compatibility and proper installation. Now let‘s tackle some frequently asked questions about curing and drying.

Answers to Common Questions About Curing and Drying

Here are some of the most common questions I get about the curing process:

How Long Does RedGard Take to Dry Between Coats?

In general, allow 2-4 hours between coats at 70°F and 50% relative humidity. The first coat must be dry to the touch before the second application.

How Long Does RedGard Take to Cure?

Full curing takes 5-7 days before flood testing. I recommend waiting at least 48 hours after the final coat before water testing the shower.

How Can I Speed Up Drying and Curing?

You can accelerate drying and curing by ventilating the area, using dehumidification, and ensuring an ambient room temperature around 70°F.

Can I Tile Before RedGard is Fully Cured?

No, never tile before the membrane has fully cured! Wait at least 48 hours after the final coat before installing any tile or grout.

I hope those tips clear up the most common curing questions. Now let‘s go over maintaining your RedGard shower for the long run.

Caring for Your RedGard Shower Long-Term

With proper installation and curing, RedGard will provide reliable waterproofing for around 10-15 years. To maximize the lifespan:

• Squeegee the walls after each use to prevent mineral deposits and soap scum buildup.

• Use a non-abrasive cleaner to keep your tile and grout looking fresh.

• Inspect annually for leaks, damage, and re-apply sealant as needed around fixtures.

• Look for cracks or gaps in the grout where water could seep through to the RedGard. Re-grout as necessary.

• Plan to reapply waterproofing paint every 5-6 years as preventative maintenance.

With regular care and maintenance, your shower can stay watertight for over a decade!

Have More RedGard Questions? Here are Answers!

Let‘s wrap up with some rapid-fire RedGard Q&A:

How Many Coats of RedGard Should I Apply?

Two coats is recommended – a primer coat diluted with water and a second full-strength coat.

What Thickness of RedGard Should I Aim For?

Target around 30 mils or 1/16" – 1/8" thickness when completed.

Does RedGard Need a Sealer or Top Coat?

No, RedGard doesn‘t require a sealer once cured. But you can apply a top coat of waterproofing paint every few years.

Can I Install an Exhaust Fan Over RedGard?

Yes, just leave space between the RedGard membrane and any fasteners that penetrate it. Then seal properly.

How Do I Transition RedGard to Non-Waterproofed Areas?

You can terminate RedGard on vertical surfaces just above the typical water level line. Or fully encapsulate seams with fiberglass mesh.

And that about covers it! I hope this guide gave you all the details on effectively using RedGard for your shower waterproofing project. The key is proper surface prep, application per the directions, allowing full curing time, and regular maintenance.

Let me know if any other RedGard or bathroom renovation questions come up! I‘m always happy to help out with expert insights.