Evolution of Inswing Windows
On the left, you can see an old pour and debridge inswing window. Looking at the arrow, you can see how air and water can flow through the system. To mitigate the air & water flow problem, you can see in the middle detail that the inswing was turned around to make an outswing window, and while this helps keep air and water out of the window system, there is still the problem with no thermal break between the sash and the frame. On the right is a Peerless inswing window with a center vent gasket. Incorporating a thermal center vent gasket creates a full thermal break line starting at the glass through the frame. Any water that could potentially get in the system is mitigated by leaving the exterior gasket off to equalize pressure so that water can flow out of the weep. All of the changes to Peerless inswing windows over the years have lead to more advances in thermal, air, and water performance!
