Pressure Washing a House?


I have never pressure washed my house. But is it necessary before I paint it?

4 Responses to “Pressure Washing a House?”

  • Elvie Grace 'Aweng' Mora:

    What is necessary before painting your house is “wall preparation”. Using a pressure washer is just one of the methods you can use to prepare your exterior walls. This method has both its good and bad points. The tool is effective in cleaning surfaces, and is ideal in washing off dirt from the walls. On the cons, too much pressure can weaken and blast mortar from joints and remove particles from brick or wood.

    So if you decide to use it, try to control the pressure and avoid setting it too high. And another thing, let the walls completely dry before applying paint. Painting too soon will affect the quality of the result.

  • erndog1001:

    Unless the house is really totally filthy its not.Just take your regular garden hose and give it a good hosing down.Then spot clean as you paint.

  • cheezyhill:

    Pressure washers are a relatively new invention. Houses have been painted and lasted for hundreds and hundreds of years before they were invented.

    The advantage of a pressure washer is it will remove grime and dirt that tend to affect the binding ability of new paint to old. But it is nothing that a good garden hose and a brush can’t accomplish.

    Another advantage it is can chip off any loose paint that you would otherwise have to scrap off by hand. It may not eliminate all the hand scraping that is required before you repaint a house but it may greatly reduce the amount required. It can also loosen boards etc that are not secure so be a bit careful. Also if you use too much pressure it can mar wood and take off all the paint but with a little practice you will learn to hold it back a few inches and your should be fine.

  • John J:

    As a panting contractor we would not paint a house until it had been pressure washed. The first thing is running bleach through on low pressure. This will kill any mold and mildew on substrate. Rinse entire home this way.

    It is diluted so it will not adversely affect vegetation.

    We used a 2600 PSI pressure washer that did an excellent job. It not only removes years of dirt and grime it opens up the pours of the surface being painted. The paint gets much better better adhesion on a clean surface.

    The benefit to pressure washing it removes the dirt and grime vs using a hose to just rinse it.

    Word of caution. You are injecting water into the surface to be painted. Wait at least 48 hours before painting. This allows your substrate plenty of dry time.

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