The Ultimate Guide to Waterproof Outdoor Decks and Glass Balustrades

Creating a waterproof outdoor deck or balcony is essential to protect your home from water damage and ensure the longevity of your structure. When combined with a sleek glass balustrade, it can transform your outdoor space into a stunning, functional area. Below, we’ll answer all your questions, from waterproofing methods to glass balustrade designs, and provide a call to action to connect with Royal Glass for expert advice.


1. What is the Best Way to Create a Waterproof Outdoor Deck?

To create a waterproof outdoor deck, follow these steps:

a. Choose the Right Materials

  • Use pressure-treated timbercomposite decking, or concrete for the deck base.
  • Ensure all materials are rated for outdoor use and resistant to moisture.

b. Install a Waterproofing Membrane

  • A waterproofing membrane is a critical layer that prevents water from seeping into the structure below.
  • Apply the membrane over the deck substrate before installing the final surface (e.g., tiles or decking boards).

c. Ensure Proper Drainage

  • Slope the deck slightly  to allow water to drain away.
  • Install drainage channels  to direct water off the deck.

d. Seal All Joints and Edges

  • Use waterproof sealants to seal gaps between boards, around fixtures, and at the edges of the deck.

e. Regular Maintenance

  • Inspect the deck regularly for cracks, gaps, or wear in the waterproofing membrane.
  • Reapply sealant as needed to maintain waterproofing.

2. What is a Waterproofing Membrane?

waterproofing membrane is a thin layer of material applied to surfaces to prevent water penetration. It is commonly used on decks, balconies, and roofs. 


3. What is the Best Way to Waterproof a Balcony?

Waterproofing a balcony involves similar steps to waterproofing a deck but with additional considerations:

  • Surface Preparation: Clean and repair the balcony surface before applying the membrane.
  • Membrane Application: Use a high-quality waterproofing membrane suitable for balconies.
  • Tile or Surface Installation: Install tiles or another finish over the membrane, ensuring proper adhesion and drainage.
  • Edge Details: Pay special attention to edges, corners, and drainage points to prevent leaks.

4. When is the Best Time to Waterproof a Balcony?

The best time to waterproof a balcony is:

  • During Construction: Integrate waterproofing into the initial design and construction process.
  • Before Installing Finishes: Apply the membrane before laying tiles or other surface materials.
  • Dry Weather: Waterproofing should be done in dry conditions to ensure proper adhesion and curing.

5. What is the Best Design to Fix Glass Balustrades to a Waterproofed Deck?

Fixing glass balustrades to a waterproofed deck requires careful planning to avoid compromising the waterproofing. Here’s how to do it:

a. Use side-Mounted Fixings

Spigots or Standoffs: These are mounted directly onto timber joist underneath the floating deck 

b. Avoid Penetrating the Membrane

  • Where possible, avoid drilling into the waterproofing membrane. If drilling is necessary, use waterproof seals around the fixings.

c. Ensure Proper Drainage

  • Design the balustrade base to allow water to drain away from the deck surface.

6. Suggested Glass Balustrade Designs for a Waterproofed Deck

Here are some design options for glass balustrades on a waterproofed deck:

a. Frameless Glass Balustrades

  • Design: Sleek, modern look with minimal hardware.
  • Installation: Use surface-mounted spigots or channels.
  • Advantages: Unobstructed views, easy to clean.

b. Semi-Frameless Glass Balustrades

  • Design: Combines glass panels with minimal framing for added support.
  • Installation: Use top and bottom rails 
  • Advantages: Provides extra stability while maintaining a clean look.

c. Framed Glass Balustrades

  • Design: Glass panels held within a metal or timber frame.
  • Installation: Frames are sealed to the deck surface to prevent leaks.
  • Advantages: Robust and durable, ideal for high-traffic areas.


Yes, glass balustrades are an excellent choice for waterproofed decks because:

  • They provide safety without obstructing views.
  • They are low-maintenance and durable.
  • When installed correctly, they do not compromise the waterproofing.

Call to Action – Consult Royal Glass for Expert Advice

Designing and installing a waterproofed deck with glass balustrades requires expertise and precision. At Royal Glass, we specialize in creating stunning, safe, and leak-proof outdoor spaces. Whether you need advice on waterproofing, balustrade design, or installation, our team is here to help.

📞 Call us now at 0800 769 254
📧 Email us at support@royalglass.co.nz
📍 Visit our showroom at 13E Paul Matthews Road, Rosedale, Auckland 0632
🌐 Explore more at www.royalglass.co.nz

Let Royal Glass transform your outdoor space with a waterproofed deck and elegant glass