Question How much does a mirror weigh?

[PaulSF]

Specifically, a mirror that is 16 inches x 60 inches. Is there a handy-dandy rule of thumb for this sort of thing?

 

[Paul N]

Beveled or not?? Beveled is 1/4 inch and is always heavier than the non beveled.

I remember somebody posting something about such weights a few months ago.

 

[Jeff Rodier]

1/8" or 1/4". Figure 3 pounds per square foot for an estimate.

 

[PaulSF]

It's probably not going to be beveled (that would look bad on such a narrow piece, plus it's going in an office lobby. So I should estimate about 20 lbs for the mirror. Designer wants a very skinny frame, surprise surprise.

 

[Paul N]

1/8" or 1/4". Figure 3 pounds per square foot for an estimate.

Are you saying they weigh the same??

 

[Jeff Rodier]

Are you saying they weigh the same??

Nope and that is why I used the word estimate. Using a narrow frame would cause me to use 1/8".

 

[PaulSF]

So Jeff, is 3 lbs. psf for the 1/8 inch, or for the 1/4-inch?

 

[Jeff Rodier]

Close to 2 1/2 or 4. This is a combination of the glass weight plus the miiror surface applied to the backing. Mirror quality and actual thickness vary even with stated thickness. I frame a lot of the double sink mirror which is 42x65 here. I lift it into the glass cutter with my hands gripping the top edge bare handed. If the frame is extra narrow I would back it with masonite screwed into the back of the frame to prevent bowing. Z-Bar is the best hanging system and only needs to be on the top of something the size you are working with.

 

[Rob Markoff]

WEIGHTS:

Glass Weight per Square Foot

1/8"=1.64 lbs.sq.ft.
3/16"=2.45 lbs.sq.ft.
1/4"=3.27 lbs.sq.ft.
3/8"=4.91 lbs.sq.ft.
1/2"=6.54 lbs.sq.ft.
3/4"=9.84 lbs.sq.ft.
1"=13.11 lbs.sq.ft.

A 16 x 20 piece of 1/4" glass is 2.22 square feet or about 7 1/4 lbs.

Mirror is slightly heavier due to the silvering.