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Timber sash · spiral balance
Vertically sliding timber sashes supported by a spiral-balance mechanism.
- Vertical sliding operation
- Spiral-balance mechanism
- Traditional sash proportions
Product details
Familiar proportions. A different balance.
View full size A spiral-balance sash retains the vertical sliding movement and familiar proportions of a timber sash window. Its balancing mechanism differs from the cord, pulley and weight arrangement of a traditional box sash.
Meeting rails, glazing bars, horns and surrounding timber details influence how the window sits within the facade. These details can be discussed alongside operation and glazing, with the final balance system selected for the sash weight.
Inside the construction
Look a little closer.
Open the drawings to inspect frame, glass and fixing details.
Spiral-balance sash sections
Double- and triple-glazed frame, sash and cill details. Final joinery and installation details may differ.
Open full-size Construction & detail
Character, down to the detail.
Specification
At a glance.
- Operating mechanism
- Spiral balance
- Glazing and hardware
- Selected for the opening and sash weight
Joinery, fit & operation
Two ways to balance a sash.
Both options move vertically. The practical choice is how the sash is balanced, how the frame fits your opening and which joinery details suit the building.
The balance mechanism alone does not determine warmth, price, maintenance or planning suitability. Confirm the construction, glazing, seals and installation for the proposed window. Listed-building and conservation requirements must be checked for the individual property.
| Compare the detail | Explore this system Timber sash · traditional weights
| You’re viewing Timber sash · spiral balance
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|---|---|---|
| How it balances | Cords run over pulleys to counterweights housed beside the opening. | Spring balances support the moving sash; the balance is selected for its weight. |
| Frame and opening | Allow for weight pockets and review box-frame depth, reveals and existing joinery. | Review the balance channels, frame depth and fixing detail against the available opening. |
| Appearance | Meeting rails, horns, mouldings, glazing bars and visible pulley details shape the result. | Meeting rails, horns, mouldings, glazing bars and balance-channel details shape the result. |
| Glazing and sash weight | Choose the glass and sash construction before confirming counterweight size and travel. | Choose the glass and sash construction before selecting the balance rating and travel. |
| Care and access | Discuss access to cords, pulleys and weight pockets as part of the frame detail. | Discuss access to the balance mechanism and the proposed hardware. |
| Thermal and weather performance | Confirm for the complete window, including glazing, seals and installation. | Confirm for the complete window, including glazing, seals and installation. |
| A useful starting point | When retaining cord-and-pulley operation is part of the joinery brief. | When a spring-balanced arrangement suits the available frame detail and chosen sash. |
| Your project | Timber sash · traditional weights | Discuss Timber sash · spiral balance |
Your project
Set out the sash proportions.
Share the window dimensions and photographs showing meeting rails, horns and glazing bars. Tell us your glazing priorities so we can review the sash proportions and spiral-balance arrangement.
Discuss Timber sash · spiral balance