Why Every Sash Window Needs Professional Draught Sealing

Why Draught Sealing Timber Sash Windows Matters More Than You ThinkBy MST Window Repairs – Sydney’s Sash Window Experts

Timber double-hung sash windows are a beautiful, functional piece of heritage architecture—and a common feature in Sydney homes. But while they look stunning, they often come with a hidden issue: gaps that let in cold air, noise, and dust.

Let’s explore why those gaps exist, what problems they cause, and how MST Window Repairs solves them with modern draught sealing technology.

Why Are There Gaps in Sash Windows?

Unlike fixed windows, sash windows are designed to move. Both the upper and lower sashes slide vertically, requiring clearance on all sides—top, bottom, and edges—to ensure smooth operation. These intentional gaps allow the timber frames to:

• Slide past each other freely

• Avoid sticking due to seasonal timber expansion

• Operate without constant maintenance or lubrication

  
  

However, those same necessary gaps—usually just a few millimetres wide—can let in:

• Cold draughts during winter

• Hot air and dust in summer

• Noise pollution from outside

• Loose movement and rattling sounds

And over time, wear and tear can make these gaps even larger.

How Draught Sealing Solves the Problem

At MST Window Repairs, we use cutting-edge brush pile draught sealing, specifically engineered for sliding sash windows. Our system doesn’t just fill the gaps—it maintains the window’s mobility while creating a full seal.

The key is our twin-fin brush pile:

• ✅ Two Central Fins: These flexible fins sit in the middle of the brush, forming a tight, durable seal that blocks airflow, noise, and dust.

• ✅ Soft Brush Pile: The brush bristles cushion the sash and guide it smoothly as it moves—no friction, no binding.

• ✅ Invisible & Discreet: Installed into the new draught stop and parting beads, these seals become an integral part of the window—blending seamlessly and remaining invisible to the eye.

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Benefits of Draught Sealing

By installing this advanced sealing system, you’ll enjoy:

• 🪟 Tighter, quieter windows — no more rattling or loose movement

• 🌬️ Elimination of draughts — keeps warm air in and cold air out

• 💡 Lower energy bills — better thermal efficiency means less heating and cooling

• 🌿 More sustainable living — cut down on energy use and carbon footprint

• 🛠️ Improved operation — windows glide smoothly and feel more solid

Maintain the Charm, Improve the Comfort

Heritage timber windows are worth preserving—but they shouldn’t come at the cost of comfort. At MST Window Repairs, our draught sealing service enhances performance without changing the appearance or function of your sash windows.

Get in touch today for a no-obligation quote and breathe new life into your timber windows—quieter, warmer, smoother.