How often to wash a house around Knoxville
Shade, trees and how wet a surface stays decide the schedule more than the calendar does.
A starting schedule
| Surface | Full sun | Shade or under trees |
|---|---|---|
| Siding | Every 2 years | Every year |
| Shingle roof | Every 3 to 5 years | Every 2 to 3 years |
| Wood deck | Every year or two, before staining | Every year |
| Driveway and walks | Every 1 to 2 years | Every year, before winter |
| Gutters | Spring and late fall | Spring, fall and after storms |
These are rules of thumb, not promises. A north wall next to a creek in Powell will grow back faster than a south wall in a Farragut cul-de-sac.
The best time of year
After the pollen
Spring pine and oak pollen turns everything yellow in April and early May. Washing before it's done means washing twice. Late May through early summer is a good window for siding and decks.
Before the leaves
Early fall is ideal for driveways and walks, so they go into winter without a slick green film. Gutters wait until the leaves are down.
Not in a freeze
Below about freezing, rinse water ices on steps and drives. Winter work is done on mild days.
Signs it's time
- A green tint on the shady side of the house
- Black streaks running down the roof from the ridge
- A slippery front walk or basement stairs after rain
- Gray deck boards that splinter when you sweep them
Common follow-ups
Can you wash too often?
Not with a soft wash. With high pressure, frequent washing wears soft surfaces faster, which is one more reason to match the method to the surface.
Should I wash before painting?
Yes. Paint doesn't stick well over mildew or chalk. Wash, let it dry a couple of days, then paint.
Does rain wash my house for me?
Rain moves loose dust around, but it feeds the algae and mildew rather than removing them.