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Trapped moisture doesn’t just sit on the surface. Over time, it rots the decking and invites mold. In this climate, a small leak can lead to major repairs.
A quality membrane does more than stop leaks. It provides a durable, non-slip surface that withstands summer sun and winter ice. Enjoy a clean, finished look that enhances your home without constant upkeep.
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| Balcony Membrane Thornhill Material Type | Square Foot Price | Per Square Foot Price | Small Balcony Price | 100 Sq Ft Balcony Price |
|---|---|---|---|---|
| Standard Membrane System | CAD 5 – 15 | CAD 5 – 15 | CAD 800 – 1,500 | CAD 500 – 1,500 |
| Vinyl Decking Membrane | CAD 4 – 10 | CAD 4 – 10 | CAD 800 – 1,000 | CAD 400 – 1,000 |
| Full Waterproofing System | CAD 36 – 80 | CAD 36 – 80 | CAD 7,200 – 8,000 | CAD 3,600 – 8,000 |
| Liquid-Applied Polyurethane | CAD 3 – 8 | CAD 3 – 8 | CAD 600 – 800 | CAD 300 – 800 |
| Torch-On Bituminous Sheet | CAD 2 – 6 | CAD 2 – 6 | CAD 400 – 600 | CAD 200 – 600 |
Prevent water damage
A cracked membrane can turn a balcony into a slow drain. It sends water directly into the deck and the walls below. Our solution seals the surface with a flexible layer that moves with temperature changes without splitting.
We remove the old surface, fix any rotted wood, and then bond a new balcony membrane in Vancouver directly to the deck. This creates a single shield that directs rain to the drain and keeps the structure dry underneath.
In Thornhill, balconies face heavy autumn rains and damp winter air. A small leak can stain a ceiling and cause rot in the rim joist quickly.
Many homes in the area are on sloped lots where wind-driven moisture hits the upper decks the hardest. Choosing a membrane that can handle standing water and UV exposure means fewer repairs and a deck that stays safe all year.
Membrane installation in Thornhill
In Thornhill, we start by fully removing the old surface to expose the plywood underneath. We replace any damaged sheathing and check that the deck slopes at least two percent toward the drain. This slope is important for handling heavy rainfall from October to March. We also need to ensure that subfloor moisture readings drop into the low teens before we can prime the surface. This step often requires a day or two of dry weather due to the damp climate.
Once the substrate is ready, we apply a single-component polyurethane or fast-cure PMMA liquid membrane using a roller. This membrane has an embedded polyester fleece that strengthens movement joints and wall transitions, preventing cracks from thermal cycling. The liquid membrane cures well in high humidity and remains flexible down to freezing temperatures. It can handle minor movements typical in wood-framed homes on Thornhill’s hillsides. We bond upturn flashings at parapets and door thresholds while the topcoat is wet, creating a waterproof layer that directs standing water to the outlet.
A balcony membrane in Thornhill acts as the main drainage layer for the exposed deck. It captures rain and melting snow, directing that water past the rim joist and wall assembly. This design prevents water from moving sideways into the sheathing. The membrane at the building wall overlaps behind the housewrap or fluid-applied weather barrier, forming a shingled lap that stops wind-driven moisture from bypassing the deck’s edge. This is especially important on sloped lots where gusts can push water uphill.
The deck-to-wall junction faces the highest hydraulic load, so we include a pre-formed pan flashing at the door sill. This flashing channels any weeping water outward onto the deck surface. Below the membrane, a sloped mortar bed or drainage mat can provide an extra escape route for water. However, on most Thornhill balconies, where the deck is above living space, the liquid membrane alone, with its seamless bond to the upturn flashings, serves as both the primary and secondary water control. We also ensure that all steel lath and fasteners are placed below the waterproof layer to prevent hidden metal from transmitting water to the framing.
