How often should you pressure wash and paint?

by Theresa
(Jacksonville, FL, USA)

I am on a homeowners' committee in a Pulte built community of town homes. I hope that you can advise us about some important issues.

The community is four years old and the exterior consists of Hardee Board plank siding, unpainted brick and stone, and wood trim. It is in Jacksonville, Florida where there is high humidity throughout the year and temperatures hover in the 90's from May through October.

The exteriors of the buildings were painted with Sherwin Williams paint and have been professionally pressure washed twice during the past two summers with a chlorine and water solution. How often should the buildings be pressure washed, how often would you recommend painting, and how soon after the initial painting should the buildings be repainted?