What type of siding is traditionally installed last in a siding installation process?

In a siding installation process, siding panels are traditionally installed last because they serve as the primary protective layer against the elements. The installation sequence is crucial for ensuring proper weather resistance, aesthetics, and functionality.

Initially, an underlayment may be applied to provide an additional barrier, followed by trim boards which are often installed to frame the windows, doors, and edges of the siding panels. Flashing is also an integral part of the installation as it directs water away from areas where the roof meets walls and around openings to prevent water intrusion, but these are generally installed prior to the siding panels.

Since siding panels are the final exterior layer, they need to overlap properly with the other components to create a seamless transition and prevent water infiltration. The panels' position at the end of the installation ensures that any water running down the wall will flow over the trim and under the panels, promoting effective drainage. This sequence is essential for maintaining the durability and longevity of the siding system.