
Key Takeaways
- Waterproofing your sliding glass door will prevent costly water damage and enhance the safety of your home.
- Essential tools for the task include a caulking gun, a utility knife, and weather stripping.
- High-quality silicone sealants are recommended for a durable and effective seal.
- Panda Windows & Doors has been a trusted custom luxury door manufacturer for over 30 years.
Why Waterproofing Your Sliding Glass Door Matters
Sliding glass doors are a beautiful addition to any home. But if they are not sealed properly, this can result in significant issues, like:
- Mold growth and structural damage
- Heat loss in winter and heat gain in summer
- Ruined interior finishes and furniture
- Reduced lifespan of the door
- Increased risk of slippery floors and electrical hazards
The good news is waterproofing your sliding glass door can be a DIY project - if you follow our instructions.
Since our founding in 1991, Panda Windows & Doors has specialized in state-of-the-art custom glass wall systems for both residential and commercial spaces. Operating from our manufacturing facility in Las Vegas, Nevada, we have been at the forefront of innovation for over 30 years. Our product offerings, which include over 80 high-end options, such as pivot doors, French doors, folding doors, lift & slides, multi-slides, horizontal sliding walls, and operable windows, are available in a range of materials, including aluminum, steel, stainless steel, bronze, solid wood, and aluminum-wood clad.
Our company is widely recognized for its award-winning designs, engineering solutions, and rapid delivery times. We ensure that our customers throughout the U.S. and Caribbean receive their products within 6-10 weeks. Our company is trusted by leading architectural firms and glaziers nationwide, and we stand as the premier manufacturer of custom luxury windows and doors in the United States.
Learn About Custom Solutions from Panda Windows & Doors Today
Tools And Materials You’ll Need
1. Weatherstripping: Vinyl, fuzzy, foam, or silicone-based.
2. Water-Resistant Sealants: Silicone caulk or Flex Shot.
3. Cleaning Supplies: Damp cloth, soap, and water.
4. Measuring Tape: For measuring the door frame.
5. Utility Knife or Scissors: For cutting weatherstripping.
6. Caulk Gun: For applying silicone caulk.
7. Flex Shot Applicator: If using Flex Shot.
8. Box Cutter or Knife: For cutting the Flex Shot extension tube.
9. Paper Towels: For cleaning excess sealant.
10. Plastic Window Kits (Optional): For additional insulation.
11. Compression Strips (Optional): For added sealing.
Step-by-Step Guide To Waterproofing Your Sliding Glass Door

Professional help can be beneficial but is not always necessary for effective waterproofing.
Step 1: Prepare the Door
- Inspect the Door Frame: Check for any gaps or cracks in the door frame and surrounding areas.
- Clean the Area: Use a damp cloth to wipe down the door tracks and frames. Make sure the surfaces are dry before proceeding.
- Remove Old Weather Stripping: Take out any worn-out weather stripping to make way for new materials.
Read More: How to Clean Sliding Glass Door Tracks: Homeowner's Guide
Step 2: Apply Weather Stripping
- Choose the Right Weather Stripping: Select a suitable type (vinyl, fuzzy, foam, or silicone-based) based on your needs.
- Measure and Cut: Measure the door frame and cut the weather stripping to size.
- Apply the Weather Stripping: Peel off the adhesive backing and press the strips onto the door frame, starting from the top and working your way down.
- Check the Seal: Close the door and check for any gaps. Adjust the weather stripping as needed.
Step 3: Seal with Water-Resistant Sealants
- Prepare the Area: Check that the area where you will apply the sealant is clean and dry.
- Apply Silicone Caulk or Flex Shot:
a. Silicone Caulk: Use a caulk gun to apply silicone along the edges of the door frame.
b. Flex Shot: Cut the tip of the extension tube at a 45-degree angle. Apply Flex Shot along the border where the glass meets the frame and around the outside of the door frame, avoiding the track area. Smooth out the excess with a finger or caulking spatula.
Step 4: Insulate and Test
- Use Compression Strips or Plastic Window Kits (Optional): Apply compression strips to the door channels for added sealing or use plastic window kits for insulation.
- Test the Door: Open and close the door to check that it slides smoothly and seals properly.
Step 5: Regular Maintenance
- Regularly inspect and replace weather stripping as needed to maintain the seal.
- Clean the door tracks regularly to prevent debris buildup.
Choose Panda Windows & Doors For Custom Sliding Glass Doors

Panda manufactures doors that complement the look of your space.
If you’re looking to upgrade or replace your sliding glass doors, Panda Windows & Doors provides you with custom options (lift & slide, multi-slide, and horizontal sliding walls) designed for optimal elegance and performance. Here’s why you should choose us:
1. Unparalleled Customization: We focus on custom luxury products for both residential and commercial projects.
2. Quality Materials: All our products are made with sustainable materials like aluminum, steel, stainless steel, architectural bronze, and wood. Our aluminum extrusions, for instance, are made of 70-75% recycled content.
3. Superior Hardware: We source premium hardware from top manufacturers around the world, including Germany, Switzerland, and Italy, not limiting ourselves to what's just locally available.
4. Advanced Features: Our sliding glass doors come with dual-glazed, low-E, tempered glass for improved energy efficiency and security. We can also equip them with automation, smart home integration, and keyless entry systems.
5. Design Flexibility: We design configurations in straight, staggered, curved, corner, and pocket styles. You can also choose from dozens of handle options and a variety of finish types.
Reach out to us to learn more about our products and get a free quote.
Frequently Asked Questions (FAQs)
What causes sliding glass doors to leak?
Leaks often occur due to improper installation, worn-out weatherstripping, clogged drainage tracks, or using the wrong door type for the climate.
What are the signs of a poorly sealed door?
1. Water stains or mold around the door frame.
2. Drafts or noticeable temperature fluctuations near the door.
3. Difficulty opening or closing the door smoothly.
4. Visible gaps or cracks in the sealant or weather stripping.
How often should I reapply waterproofing?
The frequency of reapplying waterproofing depends on several factors, including the quality of the materials used and the environmental conditions your door is exposed to. Generally, it's a good idea to inspect your sliding glass door annually and reapply sealant or weather stripping as needed.
Which sealant is best for my climate?
The best sealant for your sliding glass door will depend on your local climate. In areas with high humidity or frequent rainfall, a silicone-based sealant is recommended for its water-resistant properties. In regions with extreme temperatures, look for a sealant that remains flexible and durable in both hot and cold conditions.
What kind of warranty does Panda provide for its doors?
We provide a transferable 10-year warranty for products within the continental United States and the Caribbean and a 2-year warranty for products outside this region. Click here if you want to learn more.