FAQ: When is tempered glass required by code?

At what height do windows need to be tempered?

The glazing (glass) is less than 18 inches above the floor. The top of the glass is less than 36 inches above the floor. The size of the glass exceeds 9 square feet. The glass is within 36 inches of where people walk.

Do bathroom windows need to be tempered glass?

A bathroom window must be made of tempered glass if all the following criteria are met, according to the National Glass Association: The glazing (glass) is less than 18 inches above the floor. The size of your window exceeds nine square feet. The top of your window is less than 36 inches above the floor.

Do windows above doors need to be tempered?

In general, any glass in a door, or glass within a 24” arc of a door, is required to be safety glass. The exception is if it is more than 60” above the floor; so a window above a door (a transom), often does not need to be safety glazed.

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Is safety glass a legal requirement?

To comply with the Building Regulations glazing requirements or also known as ‘Critical Locations’ there must be safety glass or safety guards in place to protect people from injury. Safety glass should be fitted in all doors and other windows or glazed areas that are lower than 800mm from the floor level.

Does tempered glass look different?

If the glass has been tempered, you will likely see some spots or lines stretching across the pane. These lines and spots are a result of the machine rollers used during the heating process. To see these, you will need to look closely—they can be very subtle at times.

Is Tempered glass expensive?

Tempered glass is also costly to purchase, definitely more expensive than the standard glass, but less costly than laminated glass. Depending on the preferences of a building owner, the cost is another point of difference that dictates the choice between laminated and tempered glass.

Is Tempered glass stronger than annealed?

Tempered is stronger.

Heat-strengthened glass has surface compression of 3,500 to 7,500 psi, about twice as strong as annealed glass, with no edge compression standard.

How much does tempered glass cost?

“Just a sheet of tempered glass can start at $5.00 per square foot. Customizations and glass thickness will add to that number, but it will still be less than plexiglass.” Tempered glass costs around $150 to $200, lasts longer, and has a long list of other advantages.

Are tempered glass windows more expensive?

Most of the least expensive windows on the market are made of annealed glass, as tempered glass takes longer and costs more to manufacture. However, when you consider the long-term costs, tempered glass is cheaper in many cases.

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Why do bedroom doors have windows above them?

The windows above doors are called “transoms” or “transom windows.” They served two purposes: For one, in the days before widespread adoption of electricity, they allowed more light into individual rooms while maintaining privacy.

Are all new windows tempered glass?

All windows including; single pane and double pane windows need tempered glass if it’s within a certain number of inches from the door.

Can you temper an existing window?

This is why it’s easy for homeowners to upgrade their existing annealed glass to tempered glass, making their home or business safer without the cost of replacing full windows and frames. No, your windows don’t need to break to be upgraded!

How can you tell if glass is safety?

If you try to view tempered glass in sunlight with a polarized pair of sunglasses, you will see dark, shady spots or lines stretching across its surface–a prime indicator that the glass is toughened. These lines were formed by the machine rollers during the tempering process.

Is all safety glass marked?

According to section 7 of BS 6262-4:2005, the safety glass needs to be permanently marked so that it is clearly visible after installation.

What does the Kitemark mean on glass?

The Kitemark symbol of quality was first conceived in 1903 to identify glazing solutions that were at the pinnacle of safety and reliability. Today, glass kite marks remain as one of the oldest product quality marks in the world still in use.

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