Taking this from an expert in the field giving you first hand knowledge how an exterior paint reacts painting over outside wood trim and siding.
Painting exterior siding without pressure washing first.
They often succeed and then that 3000 psi water is blasting right into bare wood.
If you still want your exterior walls cleaned before painting but do not want to pressure wash yourself you might call a local painting contractor.
When pressure washing a lot of painters will get right up close to the surface to try to blast loose paint off.
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Prepare painting over old paint on wood to last before picking up a paint brush or roller few important steps to take in preparation when painting over aged paint on wood to last the longest.
If you try to paint over this chalky surface without power washing first the paint won t stick properly.
It digs holes in the surface and furs the wood grain up damaging the siding.
As an experiment rub a clean white cloth across the unwashed siding.
The point of pressure washing your house siding prior to painting is to wash it not to strip the paint.
Hopefully this helps you cleaning walls before painting exterior of your home.
But over the years your house will experience paint failure faster than if it were applied to clean siding.
You always need a clean surface for paint to stick.
Wood siding dries more slowly.
Washing your house exterior without a pressure washer siding gutters windows pavement decorating projects although cleaning siding and sidewalks isn t the most glamorous of house projects a little water and the right tools can go a long way toward improving your curb appeal.
The same thing goes for dirt and dust.
A thorough scrubbing is a must before painting any exterior surface.
It removes the dirt and broken down paint residues that keep fresh coats from adhering and gets rid of mildew that grows on paint in all but the most arid climates.
When you schedule the painting job keep in mind that it may take your house two or three days to dry after you pressure wash it depending on the siding material.
The cloth will likely come up dark gray with a layer of fine soot.
True most pressure washers are powerful enough to take off paint but for best results stripping should be a separate step done with a scraper sander or heat gun after the process of washing.