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Lloyd Alter
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Casement Window Basics
Why we like it
Modern casement windows are cranked out up to 90 degrees, and open 100% of the opening. When they close, they have lever closures that crank the window shut really tightly. If you pick the right side to open, and know the prevailing wind direction where you live, you can actually funnel fresh air into your home. The screens are on the inside, which keeps them cleaner and easy to remove when not needed. Nothing blocks the view, either open or closed.
Steve Mouzon at Original Green loves casements, and writes:
| "Casement windows are easier to make airtight than double-hung windows because the sash squeezes the weatherstripping tight to the frame when the window closes instead of sliding along the surface of the weatherstripping like double-hung sashes must do." |
I disagreed, and he pointed out:
"Lloyd, you have a point about double-hungs working well for ventilation on a still day... warm air goes out at the top, and cool air comes in at the bottom. An open casement does the same thing, but a double-hung doesn't have to be fully open to produce the same result. Actually, a double-hung is never fully open... it can't open more than 50%. So if a shower came up, then the double-hung wouldn't allow as much rain. But you definitely get more air in through a casement, especially with shutters like this."
What we worry about
An open window will be exposed to the rain, inside and out. Low quality ones can sag, particularly large ones. People are often worried about leaving them open at night for security reasons.
Eco-factor of Casement Window
Some call it the greenest window type, with maximum ventilation and best sealing in good quality windows.
More on Green Windows
Planet Green Archives: Windows
How to Reclaim a Window
Low Tech Tips: Get Working Shutters
Low-Tech Tips: Tune Your Windows
