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Spiral vs. Block & Tackle Window Balances in Commercial Windows – What to Know Now!

Commercial buildings demand robust and reliable window systems due to higher usage and the need for greater durability. The mechanisms that facilitate the opening and closing of these windows are critical to their functionality and longevity. Among these mechanisms, spiral and block and tackle window balances are prominent options. Understanding their differences, advantages, and potential drawbacks can help facility managers and builders make informed choices for commercial applications.

Spiral Window Balances

Mechanism and Design:

Spiral window balances use a spiral-shaped rod within a tube. This rod is connected to a sash and a spring mechanism that controls the tension, helping to counterbalance the window’s weight. When the window is raised or lowered, the spiral rod twists, tightening or loosening the spring to support the window’s movement.


The design of spiral balances is relatively straightforward, making them more affordable to produce and repair, an important consideration for commercial projects with budget constraints.

Spiral balances are suitable for a wide range of window types and sizes, including heavy-duty applications in commercial settings.

Their simple design often translates to easier installation, which can be advantageous for commercial renovations or new installations.


Over time, the spiral rod can wear out, especially in windows that are frequently operated, common in commercial environments. This wear can lead to reduced balance effectiveness and may necessitate more frequent maintenance or replacement.

Spiral balances may not provide as smooth an operation as other types, potentially leading to jerky or uneven movement which can affect user experience in commercial settings.

Block and Tackle Window Balances

Mechanism and Design:

Block and tackle balances use a more complex system involving a pulley (block), a cord, and a spring (tackle). The cord runs through the pulley and is connected to the spring, which helps to balance the sash’s weight. This design allows for a more controlled and smoother operation, which is beneficial in high-traffic commercial environments.


The block and tackle mechanism provides a smoother and more consistent operation, making it easier to open and close windows with minimal effort, a critical feature in commercial spaces.

These balances are more durable and long-lasting compared to spiral balances, thanks to the robust design and materials used, reducing long-term maintenance costs.

Block and tackle balances can support heavier window sashes, making them ideal for larger or more substantial commercial windows.


The complexity of block and tackle balances makes them more expensive to manufacture and repair compared to spiral balances, a factor to consider in large-scale commercial projects.

The intricate mechanism can make installation more challenging, often requiring professional expertise to ensure proper fitting and functionality.

Block and tackle balances typically require more space within the window frame, which might limit their use in some retrofit applications.

Comparative Analysis for Commercial Applications

When deciding between spiral and block and tackle window balances for commercial windows, several factors come into play:


For cost-conscious commercial projects, spiral balances may be more appealing due to their lower price point.

Frequency of Use:

In commercial environments where windows are frequently operated, the durability and smooth operation of block and tackle balances might justify their higher cost.

Window Size and Weight:

Larger, heavier commercial windows benefit from the superior load-bearing capacity of block and tackle balances.

Installation and Maintenance:

Facilities looking for easier installation and maintenance might prefer spiral balances, while those willing to invest in professional installation could opt for block and tackle balances for their long-term benefits.


Both spiral and block and tackle window balances offer unique advantages for commercial windows. Spiral balances are cost-effective, versatile, and easy to install, making them suitable for various commercial applications. Block and tackle balances provide superior durability, smoother operation, and better support for heavier windows, albeit at a higher cost and with more complex installation requirements. 
Ultimately, the choice between the two depends on the specific requirements of the commercial project, budget constraints, and long-term maintenance considerations. To schedule a consultation for repair, or for more information about commercial window balances, Contact the WRS Team! Our experts look forward to assisting you.

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