What type of screw is commonly used in fastening operations for curtain wall assemblies?

The type of screw that is commonly used in fastening operations for curtain wall assemblies is the sheet-metal screw. This is due to its design, which allows it to effectively penetrate and secure metal components often found in curtain wall systems. Curtain walls typically consist of thin metal frames and are primarily constructed from materials such as aluminum or steel, which require a fastener that can provide a strong grip without the need for pre-drilled holes.

Sheet-metal screws are designed with sharp points and threads that allow them to cut through the material, ensuring a secure attachment. Their ability to hold materials together tightly is essential for the structural integrity of curtain wall assemblies, which must withstand environmental forces like wind and temperature changes.

Other types of screws, such as wood screws, lag screws, and machine screws, are not as suitable for this application. Wood screws are designed for fastening in wood materials, lag screws are typically used for heavy-duty applications and require pre-drilled holes in thicker materials, and machine screws are suited for use with nuts and pre-tapped holes, making them less effective for direct fastening of metal sheets in curtain walls. Utilizing the correct type of screw is crucial for ensuring the durability and safety of the curtain wall assembly.