What is the function of dowels in construction?

The function of dowels in construction is primarily to join two pieces together. Dowels are cylindrical rods made of wood, plastic, or metal that are inserted into corresponding holes in adjacent pieces to create a strong and stable connection. This method is often used in furniture assembly, cabinetry, and various construction applications to enhance strength and alignment without the need for visible fasteners like screws or nails. By using dowels, builders can ensure that the connection is secure and can also help maintain the alignment of the components during assembly, which is crucial for both structural integrity and aesthetic appearance.

The other potential options serve different purposes; for example, decoration does not provide any structural benefit, while insulation focuses on thermal barriers rather than physical joining. Additionally, spacing components apart is important in certain applications but does not relate to the primary function of dowels, which is specifically to connect pieces together. Therefore, the correct answer emphasizes the structural joining role that dowels play in construction.