Window Tempering Rules and Interior Doors

Are interior doors included in the discussion of the 24/60 rule? In other words, if I have a pane of glass that is within 24 inches of an interior door, does that mean it must be tempered?

2 Answers 2

The rule is basically to use tempered glass if someone can fall through it. I don’t see any distinction made between exterior and interior doors, nor would I expect to, because exterior vs interior doors do not change this risk.

«Glazing in an individual fixed or operable panel adjacent to a door where the nearest vertical edge of the glazing is within a 24-inch (610 mm) arc of either vertical edge of the door in a closed position and where the bottom exposed edge of the glazing is less than 60 inches (1524 mm) above the walking surface shall be considered a hazardous location.» (California code, but I don’t think it matters here.) https://up.codes/viewer/california/ca-building-code-2016-v2/chapter/24/glass-and-glazing#2406.4.2

Tempered glass is Not required if the bottom edge of the window is 1) more than 18” above the floor, 2) not within 24” of a door, 3) top edge is less than 36” above the floor, 4) glass in closet doors not more than 3” wide, 5) walking surface is not within 36” of glass below 60” above walking surface. (See ICC R308)

Btw, There are only two items in the Code that are NOT grandfathered in compliance AND must be corrected as soon as discovered: 1) smoke detectors, and 2) tempered glazing.

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Laminated vs Tempered Glass Windows

There are two types of glass that you should think about installing in your home to provide extra protection: laminated glass and tempered glass. Both are treated or coated to be sure that they do not cause injury when they break. But, as with almost all materials that can be considered in home improvement, there are several pros and cons to think about.

Laminated Windows

Laminated glass windows are constructed by placing a thin layer of vinyl material between two layers of glass to create a thicker, stronger window. Laminated windows are considered extremely safe as they do not shatter easily, nor do they break apart into large pieces that could be potentially fatal. It is for this reason that laminated glass is standard for vehicle windshields.

Such windows can be designed to protect from minor explosions or even bullets, and they are considered to be highly effective in preventing theft since they require a great deal of effort (and noise) to break.

For homes in highly noisy environments, laminated windows can also provide a high level of soundproofing and make for a quiet home interior.

Most of the drawbacks to laminated glass actually come from improper installation, so finding a good installer can obviously go a long way to ensuring laminated windows remain beneficial. Since the noise reduction offered by these windows relies in large part on the air space between the two layers of glass, you must ensure that they receive a professional installation if you want adequate soundproofing benefits from it.

Tempered Glass Windows

Tempered glass windows are easier to break when compared to laminate windows because they don’t contain a coating to make them shatterproof. Instead, the glass is tempered by either using chemicals or a special process where it is heated and then rapidly cooled several times so that when it breaks, it forms small granular particles instead of dangerous shards. As such, it’s often called “safety glass.” Additionally, if tempered glass is shattered, the small granular particles it forms make it far easier to clean up than most anything else. These pieces can be easily and safely swept or vacuumed up for a quick turn-around when replacing the glass.

This type of window also tends to be less expensive than laminated windows but may need to be replaced more often, particularly if installed in a region prone to violent weather or vandalism. They are still much stronger than annealed glass, but still not as tough as the laminated variety.

Another thing to consider with tempered glass that works against it is that once the glass has been strengthened, it cannot be cut easily or it might shatter. Thus, customization is very limited with these windows.

When looking to replace windows in your home with something stronger, both of these options are good to consider. Think about the characteristics of each type carefully to choose which will best suit your needs.

Tempered windows in doors

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