The answer to 'how to install downspouts' is to properly secure downspouts to your home's exterior to direct rainwater away from the foundation. This involves measuring, cutting, and attaching the downspout sections, then connecting them to the gutter system and ensuring proper drainage.
Start by measuring the length of downspout needed to reach from the gutter to the ground or drainage area. Purchase the appropriate size and number of downspout sections, elbows, and extensions. Use a level to mark where the downspout will be attached, then secure the first section to the home's exterior with screws or downspout brackets. Connect additional sections, elbows, and extensions as needed, making sure the joints are sealed. Finish by positioning the bottom of the downspout to direct water away from the home's foundation.