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jonathan03 06-22-2010 01:57 PM

Weight of Glass Block Window
 
Is it possible for a glass block window to crush the window sill? I am removing an old wood window from a Victorian house with balloon construction built in 1880. The window dimensions are 34x74. I estimated the glass alone should weigh 250 lbs and the mortar should be 50-100 lbs more. This window is on the second floor and there is a first floor window directly below it in the same stud bays.

Will framing in this configuration be enough to support the window?

http://wayneofthewoods.com/Tiphowtoframeawindow.htm

However, keep in mind I don't have a horizontal 2x4 on the floor of the second floor since its balloon frame. The rest looks the same.

I was thinking maybe I should switch the window sill 2x4 for a header with 2x4's and plywood standing up running horizontal?

Thanks.

Yoyizit 06-22-2010 06:06 PM

A single vertical 2x4 4' long should buckle at more than 3300#. For a safety factor of four you can load it to 800#.
You can make a 1/10 scale model out of the same wood which should buckle at 34 to 70#.

The slenderness ratio is about 32 for this, so it will probably be stronger than the numbers above. Try the formula in the link below.
http://en.wikipedia.org/wiki/Buckling

But I think if you frame it like your link it will be way strong. If you have any doubts add one or two more cripple studs under the sill.

tpolk 06-23-2010 11:21 AM

look into acrylic blocks


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