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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.
Balcony Membrane Permit Requirements
In multi-family buildings in Surrey, the Zoning By-law requires balconies to be at least 5% of the unit’s floor area or 4.6 m². When replacing the membrane, you must keep the balcony’s size and layout to follow zoning rules.
You need a building permit for balcony membrane replacement in Surrey if the work affects structural parts, guards, or drainage. The project must meet the BC Building Code for guard height, structural load, and moisture protection, so check permit requirements with the City before starting.
The Noise Control Bylaw limits construction noise to daytime hours, with restrictions during evenings, nights, and certain holidays. Any membrane removal or power-tool work on your balcony must happen within these allowed hours to avoid fines.
We worked on a local school in Semiahmoo that had several buildings with failing balcony membranes. Water was leaking through cracked surfaces and dripping down the outside walls. This caused potential damage and disrupted their daily activities. We replaced the damaged membranes to fix this problem, making sure that water could no longer get through. When we finished, the balconies were completely watertight, and the staff no longer had to worry about moisture getting into the building.
Local Logistics for Balcony Membrane
We often do balcony membrane work in Semiahmoo. We get there easily by taking Highway 99 and passing through South Surrey. This drive usually takes about 45 to 60 minutes. When we need materials, we buy from local hardware stores like Harle Home Hardware and LGM Hardware Ltd. This helps support the local economy.
We install seamless balcony membranes in Semiahmoo to prevent water stains and leaks that can damage exterior walls. Our membranes include liquid-applied polyurethane or PMMA, and heat-welded PVC/TPO sheets. These create a waterproof, flexible layer that can handle foot traffic. Semiahmoo’s rainy coastal climate, salt air, and freeze-thaw cycles require a strong system with proper slope and drainage. We extend the membrane 150 mm up the wall behind the siding. You may need permits from the City of Surrey, and work must follow noise bylaw hours. Costs usually range from CAD 20 to CAD 90 per square foot, depending on the membrane type and preparation needed. We can easily reach Semiahmoo for your project.
Find answers to common questions about our services, process, and craftsmanship.