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Just wondering if there is a preferred or standard thickness for entry door IGU's. I have done 1/2" and 5/8". We have a door in the shop that I need to order glass for. Thanks
The short answer is, no.
We try to build 2 1/4" entry units. Therefore, IGU are either 3/4" or 1" depending on profiles.
We let the design drive the glass thickness, but try to get it as thick as practical since that helps the insulation factor. A bit.
Like Geoff, we shoot for 2-1/4" thick exterior sash, so the glass is often 3/4" for that. But we see 1/2" on up to 1".
Then there are the bevels.....
We are currently building two curved divided light window units at 8' tall by 12' wide, and the lights - at about 20" wide - have to be made with 1/2" glass IGU (flat) to accommodate the curve. I prefer 3/4", but it just won't work. It is not good practice to bend insulated glass units.
Thicker insulated glass does not necessarily lead to better insulating values. At a certain point the air space gets big enough to allow a circulation pattern to develop. If that happens the insulating value actually goes down.
The optimal airspace for insulating value is 7/16 to just over 1/2" so for 1/8" glass a 3/4" unit is going to give the most insulating value.