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Leaking balcony before repair
Finished waterproof balcony deck

Balcony Deck Repair and Waterproofing in Cranbury Township, NJ

The homeowners of this property in Cranbury Township, NJ were dealing with leaks from an outdoor balcony. The existing surface was no longer providing reliable protection against water intrusion, so the project required a complete balcony deck repair in Cranbury Township, NJ rather than temporary repairs to individual problem areas.

The main goal was to restore the balcony and create a reliable balcony waterproofing system that would protect the underlying wood structure from rain, snow, and moisture throughout the year.

Waterproof Vinyl Solution for the Balcony

For an exposed balcony, the finished surface needs to provide more than a clean appearance. It also needs to protect the substrate and structural components below from water intrusion.

For this project, we selected waterproof vinyl decking. An exterior vinyl membrane provides a finished walking surface while also functioning as a waterproof barrier.

When installed over a properly prepared plywood substrate with correctly detailed joints, edges, and transitions, the system helps prevent moisture from reaching the wood framing below.

Another important requirement was creating a continuous substrate and waterproof surface across the entire balcony. For this reason, the existing metal railing had to be temporarily removed before the new plywood and vinyl membrane could be installed.

Balcony Deck Repair Process

1

Inspection of the Existing Balcony

We began by inspecting the existing balcony surface and identifying the areas affected by water intrusion. The old finish showed visible wear, damage, and signs of previous repairs.

2

Perimeter Flashing Installation

The old green balcony covering was completely removed. This exposed the underlying deck and allowed us to evaluate the condition of the existing substrate.

3

Removal of the Old Plywood Decking

After removing the surface material, we dismantled the existing plywood decking. This provided full access to the wood joists and other framing components below.

Old balcony surface removal
4

Temporary Removal of the Metal Railing

The metal balcony railing was temporarily removed before the new substrate was installed.

Leaving the railing in place would have interfered with the installation of the new plywood sheets and made it difficult to install the vinyl membrane continuously across the balcony surface.

Removing the railing also provided unobstructed access to the perimeter of the deck, which matters most when waterproofing a balcony.

5

Inspection of the Wood Framing

With the structure fully exposed, we inspected the joists and supporting wood components. Particular attention was given to areas that may have absorbed moisture from the earlier leaks.

6

Framing Repair and Reinforcement

Where necessary, new wood components and additional blocking were installed to reinforce the structure.

We also checked the framing for proper alignment to create a stable and even base for the new deck substrate.

Exposed balcony wood framing
7

Installation of New Plywood Decking

New plywood sheets were installed over the prepared wood framing. Each panel was cut to fit the balcony and securely fastened to the supporting joists.

Because the railing had already been removed, the plywood could be installed properly across the full working area and up to the perimeter without unnecessary cuts around the railing posts.

8

Joint and Surface Preparation

Once the new plywood decking was installed, the joints between the sheets and other vulnerable areas were prepared for the waterproofing system.

Special attention was given to the seams to create a smooth and consistent substrate for the vinyl membrane.

9

Preparation of Edges and Transitions

Before installing the vinyl covering, we prepared the areas around the exterior wall, doorway, and perimeter edges of the balcony.

Proper detailing in these areas is particularly important during a waterproof vinyl balcony deck installation, since edges and transitions are critical parts of any exterior waterproofing system.

New plywood deck installation
10

Installation of the Waterproof Vinyl Membrane

The new exterior vinyl membrane was installed over the prepared plywood substrate.

The material was fitted across the entire balcony surface and carefully detailed around the perimeter. The finished surface has a clean, textured appearance suitable for outdoor use.

Temporarily removing the railing allowed us to install the membrane as a continuous waterproof surface without having to work around the existing railing posts.

11

Completion of the Balcony Waterproofing

After the main vinyl surface was installed, the waterproofing details were completed around the wall, doorway, perimeter, and other transition areas.

The goal was to create continuous protection that helps prevent water from reaching the plywood substrate and wood framing below.

Balcony joint surface preparation
12

Reinstallation of the Metal Railing

Once the waterproof vinyl system was completed, the metal railing was reinstalled.

Special attention was given to the railing attachment points. These connections need to be properly installed and sealed to avoid creating new paths for water intrusion.

13

Final Inspection

After installation was complete, we inspected the finished vinyl surface, perimeter details, transitions, railing attachment points, and overall condition of the completed balcony.

14

Job Site Cleanup

All removed materials, old covering, wood debris, construction waste, and material offcuts were collected and removed from the property.

The balcony and surrounding work area were left clean and ready for use.

Waterproof vinyl membrane installation

Key Features of the Balcony Repair

  • The project addressed an existing leaking balcony rather than covering the problem.
  • The old surface and plywood substrate were completely removed.
  • The wood framing was fully exposed for inspection.
  • Necessary framing areas were repaired and reinforced.
  • The metal railing was temporarily removed to allow proper installation of the new plywood and continuous vinyl membrane.
  • New plywood decking was installed over the prepared framing.
  • Plywood joints and vulnerable areas were prepared before the waterproof membrane was installed.
  • Special attention was given to balcony edges, perimeter details, and transitions.
  • A complete balcony waterproofing system was installed instead of performing isolated leak repairs.
  • The vinyl membrane provides both a finished walking surface and waterproof protection.
  • The metal railing was reinstalled after the waterproofing work was completed.
  • All construction debris was removed from the property after the project.

Balcony Waterproofing Results

The completed balcony now has a solid new substrate and a waterproof finished surface designed for exterior use.

An important advantage of this repair was that it addressed the problem below the surface, not just on top. Opening the balcony allowed us to inspect the wood framing and complete the necessary structural preparation before installing the new waterproofing system.

The new vinyl membrane protects the plywood decking and underlying wood structure from direct exposure to rain and snow while also providing a clean and practical walking surface.

Temporarily removing the railing allowed the plywood substrate and vinyl membrane to be installed without interruption, helping create a continuous waterproof system across the balcony.

For properties experiencing similar leaks or water damage, we also provide complete balcony waterproofing and repair services, including substrate restoration and installation of new waterproof vinyl systems.

Balcony Repair Cost and Timeline

The balcony deck repair in Cranbury Township, NJ included removing the existing surface and plywood substrate, temporarily removing the metal railing, inspecting and repairing the wood structure, installing new plywood decking, preparing joints and transitions, installing the waterproof vinyl membrane, reinstalling the railing, completing a final inspection, and cleaning up the job site.

Once the project was complete, the homeowner received a restored, waterproof, and fully usable balcony with a new durable exterior surface.

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Are you planning a deck repair or upgrade?

We’ll help restore your deck, replace damaged materials, improve its safety, and protect it from moisture and wear. Contact us for a consultation and a free estimate for your project.

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