2 Hour Fire Rated Windows

2 hour fire rated windows stand as a formidable defense against the spread of fire. These specialized windows are engineered to endure intense heat for up to 120 minutes, providing critical time for evacuation and emergency response. But what sets them apart from other fire rated windows? Let’s talk about

2 Hour Fire Rated Windows

How Were 2 Hour Fire Rated Windows Invented?

Fire rated windows have undergone significant transformations over the centuries. In the late 19th century, the industrial boom led to the development of wired glass, which incorporated a mesh of thin metal wire embedded within the glass. This design aimed to prevent the glass from shattering under thermal stress, thereby enhancing its fire-resistant properties. Wired glass became a staple in factories and densely populated buildings, marking one of the earliest attempts to integrate fire resistance into window design. By the end of the 19th century, fire protection had become a major consideration in the design of industrial structures. One important type of fire-proof window design, developed by the 1890s, was the hollow-core sheet-metal window.

The late 20th and early 21st centuries witnessed remarkable advancements in fire rated glass technology. Innovations such as multi-layered laminated glass, intumescent interlayers, and specialized coatings have significantly enhanced the fire resistance of windows.

Timber or Steel?

When selecting frames for 2 hour fire rated windows, the choice between timber and steel is crucial. Both materials have distinct properties that influence their performance.

Fire Resistance

  • Steel Frames: Steel is inherently non-combustible and can withstand high temperatures without losing structural integrity. Steel frames are commonly used in fire rated windows due to their superior fire resistance.
  • Timber Frames: While timber can be treated to enhance its fire resistance, achieving a 2 hour fire rating is challenging. Timber framed fire windows are available using most species of timber provided that the timber is dense enough to meet the fire requirements.

Durability and Maintenance

  • Steel Frames: Steel frames are durable and resistant to warping, rot, and insect damage. They require minimal maintenance and are suitable for both interior and exterior applications.
  • Timber Frames: Timber frames are susceptible to environmental factors such as moisture and pests, which can compromise their integrity over time.

It’s relatively straightforward – for 2 hour fire rated windows, steel frames are generally the preferred choice due to their superior fire resistance, durability, and low maintenance requirements.

How Are 2 Hour Fire Rated Windows Different From Others

At the heart of a 2 hour fire rated window is its glazing system. Unlike standard windows, these utilize multiple layers of specialized glass interspersed with intumescent interlayers. Intumescent materials expand when exposed to high temperatures, forming an insulating barrier that impedes heat transfer. This multi-layered configuration withstands prolonged exposure to fire and prevents the passage of radiant heat.

The frames of 2 hour fire rated windows are constructed from materials with exceptional fire resistance, such as steel or specially treated aluminum. These frames often incorporate multiple chambers filled with fire-resistant insulation. The design may include thermal breaks to reduce heat conduction, further bolstering the window’s fire-resistant properties. 

To prevent the ingress of flames and smoke, 2 hour fire rated windows are equipped with advanced sealing systems. Intumescent seals around the perimeter of the window expand under heat, creating an airtight barrier that blocks fire and harmful gases.

Stay Safe With Fireresist.co

The excellent performance of our 2 hour fire rated windows stems from a combination of glazing technologies, framing systems, sealing mechanisms, compliance with rigorous testing standards, and most importantly, talent and passion for creating high quality products. Investing in your safety always pays out!