Final answer:
To prevent water infiltration, a sealing product should be applied over all new construction window flanges. This ensures a moisture-proof barrier that protects the building from water damage or mold growth. Using the right waterproof sealant is crucial for long-term protection and energy efficiency.
Step-by-step explanation:
The material that should be applied over all new construction windows flanges to prevent water infiltration is a sealing product. The primary purpose of sealing around window flanges is to ensure that no water can enter the building structure around the window, which could lead to water damage or mold growth. While caulking can be considered a type of sealing, the question is asking for the general action necessary rather than a specific product, making 'sealing' the most appropriate answer from the options given.
Proper installation involves applying a waterproof sealant around the flanges after the window is fitted but before the siding or finish trim is applied. These sealants are typically made from silicone or polyurethane and create a flexible and durable barrier against moisture. However, it's crucial that the sealing product is compatible with both the window material and the surrounding construction materials to prevent any adverse reactions that could compromise the seal.
The sealing process is an essential part of window installation for both residential and commercial buildings. Ignoring this critical step can result in expensive repairs later due to water leaks causing rot, mold, and structural damage. A well-sealed window flange contributes to the overall energy efficiency of a building by preventing drafts and moisture exchange.