Thursday, July 30, 2026 — Wholesale Blind Factory
Window condensation happens when warm, moist indoor air meets a cold glass surface — common in coastal BC because of our damp winters, frequent rain, and big swings between indoor heat and outdoor cold. The right window coverings won't eliminate condensation entirely (that's a ventilation and glazing issue too), but choosing moisture-resistant materials, the right mount style, and leaving room for airflow can noticeably cut down on fogged glass, drips, and the mould risk that comes with them.
Greater Vancouver's climate is a big part of the problem. Mild, wet winters mean high outdoor humidity for months at a time, while indoor heating keeps rooms warm and full of moisture from cooking, showers, laundry, and even breathing and houseplants. When that warm indoor air hits a cold windowpane — especially on older single-pane or poorly sealed double-pane windows — the moisture condenses right on the glass. Bathrooms, kitchens, and basements are the worst offenders because they generate the most humidity and often have the least airflow.
Yes, if the wrong material is used or the covering is mounted too tightly against the glass. Real wood blinds absorb moisture and can warp, crack, or discolour in bathrooms and kitchens. Fabric roman shades that sit flush against a damp window can trap moisture behind the fabric, which is exactly what mould and mildew need to take hold. An inside-mount covering with almost no gap to the glass also traps humid air right where condensation forms, giving it nowhere to evaporate.
Material choice matters more than style in high-moisture rooms. A few options hold up well in coastal BC's damp conditions:
Outside mount — where the covering is fixed to the wall or trim above and around the window frame rather than tucked inside it — leaves a small air gap between the covering and the glass. That gap lets warm room air keep circulating near the window instead of getting trapped in a sealed pocket, which reduces the chance of moisture condensing and lingering unseen. Inside mount looks cleaner and is fine for most rooms, but in a steamy bathroom with poor ventilation, outside mount (or leaving blinds raised during and right after showers) makes a real difference. If you're not sure which mount suits your window, our guide on measuring inside vs outside mount walks through both.
Coverings are one part of the picture — ventilation does the heavy lifting. A few habits that pair well with the right window covering:
All of our custom blinds and shades, including faux wood and cellular options, are backed by a limited lifetime warranty and made right here in Coquitlam — no offshore outsourcing, so replacement parts and repairs are easy to source if a moisture-prone room ever needs attention. If existing blinds in a damp room are already warped, sticking, or showing mildew, our repair service covers most brands including faux wood, cellular, roller, and vertical.
Every home's moisture situation is a little different — bathroom layout, ventilation, window age, and orientation all play a role. A free in-home consultation lets us look at the specific rooms giving you trouble and recommend the material and mount that fit. Call (604) 942-4201, book a free consultation, or browse ready-to-order options in our shop.
No single product eliminates condensation on its own — it's caused by humidity levels and glass temperature, which ventilation and insulation also affect. Moisture-resistant coverings like faux wood blinds and the right mount style can reduce how much moisture collects and how long it sits, which lowers the mould risk.
They can work well if you choose a fabric rated for moisture, since the honeycomb structure adds insulation between the room and the cold glass. In very steamy bathrooms with poor ventilation, faux wood blinds are often the simpler, more wipeable choice.
Basements run cooler and often have less airflow, so warm, moist air condenses more easily on the cold glass. A dehumidifier plus moisture-resistant coverings, such as faux wood blinds, both help — real wood and fabric roman shades are best avoided down there.
Outside mount leaves a small air gap that helps humid air keep circulating instead of getting trapped against the glass, which can help in poorly ventilated bathrooms. Inside mount looks tidier and is fine for most rooms with decent airflow — a free consultation can help you decide for your specific window.