In terms of emergency egress requirements, how is the net clear opening measured for a double hung window? Is it the size of the opening with the lower sash lifted, or is it the size of the opening with both sash removed?
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It is the size of the "openning"
So open your window.
Don't dismantle it, just "open" it.
The idea is that in the kind of panic most folks find themselves in with the house burning down behind them, they are lucky to have the presence of mind to figure out how to open it. Most could never manage taking the sashes out in those conditions, heck - I get customers who need me to show them every year how to flip the sashes in for washing.
Check with your local jurisdiction for code requirements. The opening has to be large enough for a fire fighter with an oxygen tank on his/her back to get through.
"A completed home is a listed home."
Local codes may vary, but the nationally adopted ones require 5 square feet of free opening acessible without using a key, etc; sill no higher than 42", and with minimum width of 20" and minimum height of 22". Note that a 20x22 window does NOT have the 5 square feet!
They're right of course.
Can you imagine a child trying to remove an upper sash so they could get out of a bedroom in case of a fire?
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One thing that usaually happens, we do a renovation, everything, etc, well anyhow, the "egress'" windows in the kids bedrooms, we end up coming back and putting in grills, or picketts and a rail, or something to keep the kids from falling or climbing out.# # # # # # # , # # #--# # # # !
When we can build an idiot proof house, they'll just raise bigger idiots.Excellence is its own reward!