NCIDQ IDFX 2026 – 400 Free Practice Questions to Pass the Exam

Jalousie windows are designed with multiple narrow slats that can be adjusted to control ventilation and light. However, a significant issue with them is their inability to form a proper seal against water. The slats can create gaps when closed, making it difficult to prevent water infiltration during heavy rain or storms. This characteristic can lead to water damage and increased maintenance costs, which is a major reason they are seldom used in modern construction, particularly in climates where waterproofing is crucial.

While jalousie windows can provide ventilation, their sealing issues are a more pressing concern that affects their overall usability in many architectural applications. Additionally, cost or aesthetic concerns are subjective and can vary by context, but the improper sealing against water is a clear and definitive drawback that limits their use.