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Very Large Awning Window4/9
I need to provide a very large awning window ( 7'0 X 4'2" ) with single glazing and 1-3/4" sash. I am using automated operators and was planning on using 6 butt hinges at the top for hinges. Can anyone suggest a better hinge method? The window is 3 stories up and I know the painters will want to pull the sash to coat it so I was thinking that the butt hinges would make it easy for the painters. It will only open about 4" for venting.
Top hinges are going to subject the sash to center sag. That is the weight of the window will want to pull the top edge of the glass (and muntins if any) down and away from the top rail. I would want to make sure the glass was sealed in place with proper permanent adhesive glazing all the way around to keep it square and in the frame. That means not using silicone but rather products made for the window manufacturing industry.
As to the hinges butts are going to be exposed to the elements if this is an exterior window. The butts aren't a bad idea but go with stainless steel or solid brass. Also make sure the pins can't come out on their own as they will be installed horizontally.
Good feedback Mr Davis !
I would make my vertical muntins one piece in length and tenon them into the top and bottom rails. This will help fight the tension that will want to make this sag.
I cannot picture holding that sash out at 90 degrees while the butt hinges are screwed in place. I think I would opt for something like a Tectus hinge for its adjustability.
If this window is in a climate where buildings are heated, and in a heated building, it should have a storm to stop condensation from forming on the interior of the glass. If the sash gets wet, and the water freezes, the putty will get blown out.
If I were building this, I would make the window fixed, and put an aluminum storm on the exterior. If ventilation is required, use the HVAC system, or put small double hung windows on each end.
I have made quite a few of these windows. The last one was in February. As stated above, vertical muntins should be full length. I make them through, and peg them. The rails should be wide, 3"" at the bottom, 2 34" at the top. I use Sapele. For a window this wide, I make a few of the horizontal muntins in the middle rows a few hundredths longer.
Fir a fixed window, Sarco Type M glazing compound would be fine.
For an operable window like this, I would go with metal. The design pushes the limits of what wood will do well.