Ok… the shady part of the house has some issues with moisture. It just doesn’t seem to dry quickly. The wood is going soft… perhaps developing mold. Your finger can push thru it with ease… It’s not wood any more! YIKES
You have a choice… you can hire a contractor to replace all the boards and spend thousands, or you can fix it yourself for less than 100!
I will show you how I do it. … and if I can… so can you.