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daluu 12-04-2012 09:04 PM

Wet exterior wall during rain - is it bad?
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I have some locations where the exterior wall of home gets water splashed on it to some extent during rain. The exterior wall is stucco I believe.

Is the wetness of the stucco wall during rain going to penetrate to the inside of the wall and wood framing and be bad over time, or is that not likely in terms of just having water splashed on the outside wall?

If it can be bad, is there a way to assess how bad it would be? I might not be able to fix/avoid water splashing on the wall much.

Here's an example photo of one area, near base of wall.

As simple measure am planning on brushing those exterior walls with waterproofing sealant to help make the water slick off the wall rather than absorb into it.

daveb1 12-04-2012 09:42 PM

Does your house have properly sloped, unblocked eavestroughs? Also make sure the downspouts drain well away from the house.

jklingel 12-04-2012 10:27 PM

Exteriors are supposed to be built to withstand weather, right? You should be OK if the wall was properly built. That said, do what you can to avoid the water, as mentioned above. Is this an eave side, or the rake/gable end of the house?

carpdad 12-04-2012 11:06 PM

Don't apply the water repellent. It would prevent the stucco from drying out.

Gary in WA 12-04-2012 11:19 PM

I agree, don't add anything to it. Probably built to CA code minimum. Here is a similar one: "R703.6.2.1 Weep screeds. A minimum 0.019-inch (0.5 mm) (No. 26 galvanized sheet gage), corrosion-resistant weep screed or plastic weep screed, with a minimum vertical attachment flange of 31/2 inches (89 mm) shall be provided at or below the foundation plate line on exterior stud walls in accordance with ASTM C 926. The weep screed shall be placed a minimum of 4 inches (102 mm) above the earth or 2 inches (51 mm) above paved areas and shall be of a type that will allow trapped water to drain to the exterior of the building. The weather-resistant barrier shall lap the attachment flange. The exterior lath shall cover and terminate on the attachment flange of the weep screed." Bold is mine, from:

daluu 12-06-2012 08:14 PM

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Originally Posted by carpdad (Post 1066595)
Don't apply the water repellent. It would prevent the stucco from drying out.

Thanks I'll heed that advice. Unfortunately, I did apply that to some (small) areas already. Should have consulted you guys first.

What I do notice is that where the water repellent was applied, the water beads on the surface of the wall rather than being soaked into it. That does seem to depend on the texture of the wall, which for the most part melds well with the repellent making it feel and behave like a glossy paint.

So in that sense, how does it prevent stucco from drying out? Or do I assume some portion is still absorbed into wall while the other is not staying outside as water beads? Can someone clarify the bad behavior of water repellent on external wall?

Also, what about some patched areas of wall, patched with concrete and where the paint is chipping off wall, how best to protect those areas? I'm not sure what the original type of paint was used, and don't want to strip the paint off the whole wall and repaint just for where the chips are. It appears the original paint was really a thick base based on the peeled off hard thick paint layer I got where it was chipping. Or it's a layer of paint mixed with something else. I'm new to painting and have never noticed dried paint that's as thick/hard as a Ruffle's potato chip (or say thick flat potato chip).

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