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Old 07-07-2012, 11:34 AM   #1
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Does washing exterior siding get wood wet?!


Hello All,

I've never washed my siding (the house is 3 years old) and it's time. However, I assume that if I'm spraying with water all up and around the siding.

Doesn't that get water up under the siding and onto the underlying wood?

And if so, doesn't that promote mold growth?!

Enlighten me please!!!!

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Old 07-07-2012, 05:16 PM   #2
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Does washing exterior siding get wood wet?!


if your home was built 3 years ago there should be a weather resistant barrier (housewrap, typar, tyvek, etc.) over the exterior sheathing and behind you wood siding. Again I say should .... one never knows what actually happens unless you were there watching how it was built. A quick call to the builder that actually built your home may provide a better answer.

The weather barrier is to keep moisture from coming into the exterior wall. wood siding is always receiving moisture and can dry out. There should not be an issue, as long as the weather barrier was installed.

my humble opinion for what it is worth.

Good luck!

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Old 07-07-2012, 05:39 PM   #3
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Does washing exterior siding get wood wet?!


Many do not recommend power washing, do it by hand
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Old 07-07-2012, 07:24 PM   #4
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Does washing exterior siding get wood wet?!


If you can't wash down your walls....then I hope you don't get any heavy rains.....

Just don't aim the water at an angle point up....

This is where a power washer is really good....you get the power to knock dirt off but there is not a large volume of water.

And....if a little bit of water does get in there....if you do it on a hot day...it will dry quickly enough.
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Old 07-08-2012, 08:27 AM   #5
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Does washing exterior siding get wood wet?!


Remember less is more when it comes to cleaning siding. I would apply a good siding cleaner with a car wash sponge are car washing brush attachment. Then rinse not wash with a power washer. Use the least amount of water you possibly can. As mentioned avoid spraying water up under the siding.

People tend to go a little crazy with pressure washers!

I assume you are talking vinyl siding or wood siding with well adhered paint by the way?
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Old 07-08-2012, 08:46 AM   #6
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Does washing exterior siding get wood wet?!


as everyone mentioned, do not spray the power washer in an upward direction toward the siding. spray at a level direction or even a downward direction a little bit and figure out the distance needed to stay away from the wall with the tip of the spayer.
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Old 07-08-2012, 09:10 AM   #7
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Does washing exterior siding get wood wet?!


if it's vinyl siding power washing is not recommended

some cleaning solutions can harm the weather resistant barrier
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Old 07-08-2012, 10:01 AM   #8
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Does washing exterior siding get wood wet?!


Also make sure your pressure is not to high, and as others have said not to close.

Rain is not at anywhere near the pressure of some power washers.
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Old 07-08-2012, 12:41 PM   #9
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Does washing exterior siding get wood wet?!


Interesting sidebar: the recent East Coast storm tore some vinyl siding off of several homes in a nearby development built maybe 10 years ago. Guess what? No house wrap on any of them - just siding over OSB. I couldn't believe it. When I built my own house four years ago, there was an inspection specifically for the house wrap. I guess the big builders can get away with more.
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Old 07-08-2012, 11:09 PM   #10
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Does washing exterior siding get wood wet?!


This is taken from the Certainteed web site on how to clean vinyl siding....

Quote:
Vinyl siding resists most common household stains,
but it will become dirty like any product exposed to
atmospheric conditions. In areas not exposed to direct
sun and rain, periodic washing with a soft bristle brush
and clean water from a garden hose may be necessary
to remove surface dirt. Chalk may also accumulate on
the surface. This is a normal condition for pigmented
materials exposed to the elements.
For best appearance, clean vinyl siding at least once a
year.
To remove soil, grime and chalk from your siding, use a
garden hose, a soft bristle brush and a bucket of soapy
water. (You can also use the solution described below in
the section dealing with mildew.) To minimize streaking,
wash the house from the bottom up.
Thoroughly rinse the siding with clean water from a
garden hose. Avoid prolonged or high pressure rinsing of
open ventilated areas. Keep cleaning solution off
surrounding fixtures and surfaces not scheduled for
washing.


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