Dual Pane Tempered Glass?

[EXISTENCE]

If I see the "tempered" glass stamp on one of the panes of a duel pane window. Is it usually the case that both panes are therefore tempered or is it only the pane that says "tempered"?

[vquestfilms.com]

It's supposed to be both panes if there is a stamp.

[EXISTENCE]

The relief washes over me. Thanks for the clarification.

[TomTint]

It's supposed to be both panes if there is a stamp.

Unless its tempered over laminate

[vquestfilms.com]

It's supposed to be both panes if there is a stamp.

Unless its tempered over laminate

In that case it would have a "laminate" stamp on it. So you would know to investigate further...

[TomTint]

We have had several cases of skylight glass with a stamp on one piece and not the other. Other times a stamp just says "safety glass" on one surface 4. In most of not all cases, the glass was 7-8 years old or older. Possibly code requirements only called for one mark.

[vquestfilms.com]

What I am told from the glass industry is that laminate will always have a "laminate" stamp whether annealed, HS, or Temp. But... if it is HS or Temp laminate, it will have the "laminate" stamp and only have an additional "Tempered" stamp if it is requested in the glass order. -FWIW

I make it a habit to check anyways because I own a fancy meter that will tell if the laminate is annealed, HS, or Temp and it looks pretty cool when you are inspecting glass that way for a custy... makes us look important.

[TomTint]

Yep, I got the same meter! I was thinking about this thread and remembered a interior deco job we did for Monster.Com and the arcehict did not want stamps on the tempered glass walls. This was 3-4 years ago, the glass co ordered the glass and did not request no stamps. Installed it and the designer pitched a fit. They had to remove it all and replace it with non stamped glass with a certificate from the mfr as to it being tempered for the building inspector. It is possible to have non labeled glass.

[MikeMN]

It's supposed to be both panes if there is a stamp.

Just because an IG unit has a tempered stamp on it, does not necessarily mean that both panes are tempered, for an example chapter 7a of the California building code says that a tempered thermopane window can be either the inner or outer pane.

[MikeMN]

Yep, I got the same meter! I was thinking about this thread and remembered a interior deco job we did for Monster.Com and the arcehict did not want stamps on the tempered glass walls. This was 3-4 years ago, the glass co ordered the glass and did not request no stamps. Installed it and the designer pitched a fit. They had to remove it all and replace it with non stamped glass with a certificate from the mfr as to it being tempered for the building inspector. It is possible to have non labeled glass.

I have seen that a lot.