How to Waterproof a Shower Bench

Do you want to create a luxurious, spa-like feel in your bathroom? If so, installing a waterproof shower bench may be the answer! A shower bench is an attractive addition to any bathroom that adds both style and convenience.

How to Waterproof a Shower Bench

Not only can it free up valuable room by providing extra storage space for toiletries, towels and other items, but it also gives you somewhere comfortable to sit while you shampoo your hair or simply relax.

With some waterproofing materials and basic tools, you’ll be able to seal off the area around your bench from moisture damage and make sure its longevity is not compromised. In this blog post we will provide detailed instructions on how to waterproof a shower bench in just four simple steps.

Importance of Waterproofing a Shower Bench for Durability and Longevity

Waterproofing a shower bench is important for durability and longevity. The material of the bench will determine what type of waterproofing is needed. Generally, any material that will be exposed to water on a regular basis should be properly prepared and sealed in order to ensure its protection from water damage.

Without waterproofing, the wood or other materials used could suffer from swelling, warping, cracking, and other forms of damage. It is also important to waterproof a shower bench as it helps with preventing the growth of mold and mildew which can cause health risks.

Additionally, properly sealing a shower bench will help prevent staining from soap scum or other materials that may be present in the bathroom.

This will not only make cleaning easier, but also ensure that the bench looks like new for longer periods of time. If left untreated, the wood or material on the bench may become discolored and potentially suffer further damage due to moisture over time.

Sealing a Shower Bench

Waterproofing your shower bench is an easy task that doesn’t take much time but can have positive long-term results for both your bathroom’s appearance and your health. Properly preparing and sealing the bench before use can save you from having to deal with costly damage down the line, as well as ensure that your bathroom looks great for years to come.

Evaluating the Materials and Construction of the Shower Bench

The next step in the waterproofing process of a shower bench is to evaluate the materials and construction. If you have a tiled shower, it is important to check that your tiling has been installed properly.

It should be constructed with waterproof mortar and grout to ensure optimal protection against water damage. When evaluating the bench material itself, look for signs of decay or water damage.

If the surface of the bench is cracked or discolored, it may be necessary to replace the bench with a new one that is more suited for waterproofing. Additionally, any exposed wood should have a sealant applied to prevent moisture from penetrating and causing rot or mold.

Once you’ve ensured your shower bench has been properly constructed and inspected for signs of water damage, you can move on to the next step in waterproofing.

You Have a Tiled Shower

Now that you’ve evaluated the materials and construction of your shower bench, it’s time to prepare it for waterproofing.

Clean and dry the surface with a damp cloth or sponge to remove any dirt or dust particles. Then inspect all seams and corners for gaps or cracks. Fill any cracks or gaps with a waterproof caulk or silicone sealant to ensure that water won’t seep through and cause damage.

Identifying Areas Prone to Water Penetration and Potential Damage

Before attempting to waterproof a shower bench, it is important to determine which areas of the bench may be prone to water penetration and potential damage. Areas of the bench which are particularly susceptible to water damage include any areas where there is a joint, crack or crevice.

This includes the outer edges of the bench, where it meets the walls and floors of the shower stall, as well as around fixtures such as faucets and drains. It is also important to inspect inside crevices or cavities for potential water leakage. If these areas are not addressed before attempting to waterproof the bench, it may lead to further problems down the line.

Other considerations when inspecting for potential water penetration include looking at any gaps between tiles or grout line in tiled benches; caulk that has become cracked or decayed; silicone sealant that has dried out or been improperly applied; and any signs of water damage or rot.

Once all potential areas of water penetration have been identified, it is time to move onto the next step in waterproofing the shower bench.

Caulk That Has Become Cracked

10 Methods How to Waterproof a Shower Bench

Method 1: Choose the Right Material

Start by selecting a suitable material for your shower bench. Opt for a material that is naturally waterproof, such as teak, cedar, or a waterproofed stone or concrete slab. Avoid materials like plywood or particleboard that are prone to water damage.

Although they may seem cheaper in the short term, using a more waterproof material will save you money in the long run. To ensure your shower bench is extra waterproof, consider applying a sealant or waterproofing agent. This will help protect the material from water damage and extend its life.

Method 2: Measure and Plan

Measure the dimensions of your shower bench and plan the waterproofing process accordingly. Consider the size and shape of the bench, as well as any intricate details or corners that may require special attention.

Once you have determined the size and shape of your bench, it is time to plan which type and how much waterproofing material you will need.

Determine the type of waterproofing material you wish to use and calculate how much is necessary to cover the entire bench. If necessary, make a diagram of the bench to help plan where and how you will need to apply the waterproofing material.

Method 3: Seal the Joints and Edges

Ensure that all joints and edges of the shower bench are properly sealed. Apply a waterproof sealant or caulk along the seams and edges, filling in any gaps or cracks. Smooth out the sealant with a caulking tool or a putty knife for a neat and even finish. Allow the sealant to dry before using the shower bench.

Apply a Waterproof Membrane

This will help keep water from getting in and causing damage. Additionally, you can apply a thin layer of silicone to the joints and edges for extra protection. This method will help ensure that your shower bench is properly waterproofed.

Method 4: Apply a Waterproof Membrane

To provide an additional layer of protection, apply a waterproof membrane to the surface of the shower bench. Cut the membrane to fit the dimensions of the bench and adhere it securely using a waterproof adhesive or thin-set mortar. Ensure that the membrane is smooth and free from wrinkles or air bubbles.

Once the membrane is in place, let it cure for 24 hours before applying sealant. After the membrane has cured, apply a generous amount of silicone caulk or grout sealer to the bench. This will provide an extra layer of waterproof protection and help keep moisture out. Allow the sealant

Method 5: Waterproof the Top Surface

Coat the top surface of the shower bench with a waterproofing product specifically designed for the material you are using. For wooden benches, apply a marine-grade sealant or a waterproofing oil to protect the wood from moisture penetration. For stone or concrete benches, use a waterproofing sealer suitable for the specific material.

For benches made of other materials, like metal or plastic, look for a sealant that is designed to work with the bench material. Apply the waterproofing product in thin, even layers and allow each layer to dry completely before applying the next. When you’ve applied several layers of sealant

Method 6: Seal the Grout Lines

If your shower bench has grout lines, it’s essential to seal them to prevent water infiltration. Use a grout sealer and apply it to the grout lines according to the manufacturer’s instructions. Allow the sealer to dry completely before exposing the bench to water. Reapply the sealer every 12-18 months to ensure that your shower bench remains waterproof.

Consider a Tile or Stone Covering

For extra protection, you can apply silicone sealant to the grout lines after the grout sealer has dried. This will provide an extra layer of waterproofing and help keep water from seeping through the grout and onto the bench. Use a waterproof silicone sealant specifically formulated for bathrooms, and follow the manufacturer’s instructions for application.

Method 7: Consider a Tile or Stone Covering

If your shower bench is constructed with a tile or stone surface, ensure that the tiles or stones are properly installed and sealed. Use a waterproof mortar or adhesive to affix the tiles or stones, and apply a grout sealer to protect the grout lines.

If your shower bench is made of wood, you can also consider a tile or stone covering. Make sure to waterproof the surface before installing the tiles or stones. Apply a waterproof barrier such as a cement board or rubber membrane over the surface before affixing the tile covering, then seal it with grout sealer and a final coat of waterproofing.

Method 8: Provide Proper Drainage

Ensure that the shower bench is designed with proper drainage to prevent water accumulation. Incorporate slopes or grooves on the bench surface to direct water towards the drain, and avoid flat areas where water can pool.

Additionally, create a sloped channel in the shower base to direct water away from the bench and toward the drain. This will help ensure that all excess water is quickly eliminated from the area. Additionally, it’s important to keep the drain clean and free of any debris or blockages that could prevent the water from draining properly.

Bench is Designed With Proper Drainage

Method 9: Regular Maintenance and Cleaning

Regularly clean and maintain your waterproofed shower bench to prolong its lifespan. Use non-abrasive cleaners and avoid harsh chemicals that may compromise the waterproofing. Inspect the bench periodically for any signs of damage or wear and make any necessary repairs or reapplications of sealant or waterproofing products.

If you detect moisture seeping through the bench or walls, address this immediately, as it may be a sign of compromised waterproofing. Do not hesitate to contact a professional if you need help dealing with any issues. Proper maintenance and cleaning can help ensure that your waterproofed shower bench will stay in great condition and last for many years to come.

Method 10: Test the Waterproofing

Before using the shower bench, conduct a water test to ensure its effectiveness. Splash water onto the bench and observe if any moisture seeps through or causes damage. If any issues are detected, address them promptly by reapplying sealant or waterproofing products as needed.

Once completely confident in the waterproofing, your shower bench is ready for use. As a final precaution, periodically check the bench for any signs of water damage or wear over time. With proper maintenance and care, your shower bench will remain waterproof and safe for years to come.


The importance of waterproofing a shower bench cannot be understated. Without proper waterproofing, your wooden shower bench will soon become warped and riddled with mold. This method of waterproofing is very easy to do and gives you the peace of mind that your shower bench will last for years to come.

Taking these small steps can help ensure that your investment in your bathroom furniture pays off years down the line. For more information on to waterproof a shower bench, be sure to check out our blog article on How to Waterproof a Shower Bench.

With even just an hour or two’s worth of work, you can make sure that you won’t have any water damage issues for years to come. Try these methods today and enjoy the peace of mind that comes with having a properly sealed wooden shower bench!

Photo of author

Adrian Green

Adrian is a woodworking hobbyist and has loved Woodworking since he was 10 years old. Back then in childhood, his father used to have a furniture shop. He used to help his dad and learned a lot from him about how to fix woodworking furniture, basic carpentry knowledge and also about how to work hard and take care of business. He enjoys woodworking as a hobby. He loves the feeling of creating something with his own hands, and the satisfaction that comes from seeing his finished products used by others.

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