What Is a Wooden Sash?
A wooden sash is a window frame made of wood. Although aluminum, stainless steel, and plastic sashes are prevalent, wooden sashes, with their traditional appeal, are gaining renewed attention. Modern wooden sashes offer improved construction, and better thermal insulation, and can accommodate larger glass areas without the rattling issues common in older designs.
With advancements in technology, wooden sashes are expected to see increasing demand.
Uses of Wooden Sash
Wooden sashes are primarily used for window frames. Today, their use extends beyond traditional frames to include large living room windows facing gardens, effectively becoming part of the wall. Their improved fire resistance is driving demand, with applications in various types of doors and skylights, enhancing their versatility as a building material.
Features of Wooden Sash
Advantages
1. High Thermal Insulation Properties
Wood, having low thermal conductivity, offers better insulation than metals like aluminum. Wooden sashes maintain comfortable indoor temperatures by minimizing heat transfer.
2. No Condensation
Their high insulation properties prevent condensation, reducing mold and mildew risks, especially when combined with double or triple-glazed, high-insulation glass.
3. Larger Openings
Wooden sashes can support larger openings than metal ones due to their strength. This flexibility allows for more open and expansive designs.
Disadvantages
1. Higher Cost
Wooden sashes are costlier than metal due to material expenses and the complexity of their production. They also require careful design and construction to avoid direct exposure to rain.
2. Regular Maintenance Required
Wood is susceptible to water and moisture, necessitating regular maintenance to prevent deformation and to account for material expansion and contraction.
Types of Wooden Sash
The Hebe-Schiebe, a German sliding sash system, is a popular wooden sash type. It provides an airtight seal when locked and opens smoothly upon unlocking. Compatible with various window types, it’s available for external and internal casement windows, framed windows, wooden doors, and folding doors.
Despite their wooden construction, most modern wooden sashes meet fire safety standards. Improvements in glass technology have also made it possible to use non-screened glass while maintaining fire resistance. By pairing wooden sashes with fire-rated glass, their advantages, including large openings, can be fully utilized.