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Those stains indicate water is getting behind your siding, where it can rot sheathing and framing. A failed membrane allows moisture in with every rainfall, and in this coastal climate, that adds up fast.
The membrane also protects the balcony surface from UV damage and moisture. It keeps the area beneath dry and usable, so you can enjoy your outdoor space without worrying about leaks.
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| Balcony Membrane Semiahmoo Membrane System Type | Semiahmoo Substrate Condition Price | Semiahmoo Membrane Overlay Price | Semiahmoo Full Tear-Off Price | Semiahmoo Deck Size Price |
|---|---|---|---|---|
| Vancouver Balcony Membrane System | CAD 20 – CAD 50 | CAD 20 – CAD 40 | CAD 40 – CAD 80 | CAD 10 – CAD 20 |
| Liquid-Applied Polyurethane Membrane | CAD 20 – CAD 50 | CAD 20 – CAD 40 | CAD 40 – CAD 80 | CAD 10 – CAD 20 |
| Torch-On Bituminous Sheet Membrane | CAD 40 – CAD 70 | CAD 20 – CAD 40 | CAD 40 – CAD 80 | CAD 10 – CAD 20 |
| Bonded PVC Sheet Membrane | CAD 60 – CAD 90 | CAD 20 – CAD 40 | CAD 40 – CAD 80 | CAD 10 – CAD 20 |
| Two-Component Cementitious Membrane | CAD 20 – CAD 40 | CAD 20 – CAD 40 | CAD 40 – CAD 80 | CAD 10 – CAD 20 |
Protection from Water Damage
When water stains show up on the siding below your balcony, it means moisture is getting through. A balcony membrane for Vancouver homes prevents that water from reaching your exterior walls.
Our team applies either a liquid-applied or sheet membrane that sticks directly to the balcony surface. This creates a waterproof layer that lasts and can handle foot traffic without cracking.
Semiahmoo’s balconies deal with moisture almost all year, especially from October to April. This constant wetness requires a membrane that won’t fail with standing water or freeze-thaw cycles.
Many homes in Semiahmoo have elevated decks and balconies overlooking the coast. The salt air and heavy rain speed up wear on exterior surfaces, making a strong waterproofing solution necessary.
Balcony Membrane Installation
A liquid-applied membrane, like polyurethane or PMMA, is rolled onto the prepared surface. It cures into a seamless, flexible layer that can expand and contract with the balcony’s temperature changes. For sheet systems, PVC or TPO membranes are laid down and heat-welded at all seams. This creates a watertight surface that resists standing water and salt air.
Installation starts with grinding the existing surface to make it smooth and stable. Then, a primer is applied to help the membrane stick. Around drains, railings, and door thresholds, preformed corners and reinforcing fabric are used. These are embedded in the liquid membrane or bonded with sheet flashings.
In Semiahmoo, the membrane must extend up the wall at least 150 mm behind the siding’s drainage plane. It then ends under a counterflashing. This setup ensures that water hitting the wall is directed onto the balcony surface and not behind the siding.
A balcony in Semiahmoo’s rainy climate acts like a horizontal barrier, needing a minimum 2% slope to stop standing water. Standing water can damage the membrane and encourage algae growth. The slope is built into the surface using a sloped mortar bed or tapered insulation, directing water toward an overflow drain.
Under the membrane, a drainage mat or separation layer allows moisture to move to the deck edges, where it can evaporate instead of getting trapped against the sheathing. This extra drainage is important in coastal areas where humidity and frequent rain keep materials wet for long periods.
At the door threshold, stepped flashing is integrated with the membrane and a raised curb to prevent water from entering the wall. The balcony railing posts are anchored through sealed membrane penetrations with compression fittings. This keeps the barrier intact while handling the wind loads typical of exposed areas in Semiahmoo.
