What challenge is commonly associated with in-swinging casement windows?

In-swinging casement windows are fitted to open inward, which presents a specific challenge when it comes to making them weather-tight. This design can expose seals to wear and tear over time due to their movement. When they swing inside, it can be more difficult to achieve an adequate seal against water infiltration and air leaks compared to other window types that swing outward or slide. Additionally, the mechanics required for internal operation may complicate the sealing process, making it more crucial to ensure that gaskets and other sealing materials are correctly installed and maintained.

The fact that in-swinging casement windows open into the living space can also present challenges in terms of cleaning and maintenance but does not directly impact their ability to be weather tight. Thus, while options concerning ease of installation, airflow restriction, and cost are noteworthy considerations for windows, the primary concern with in-swinging casement windows revolves around their tendency to have difficulty achieving a reliable weather-tight seal over time.