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Old 04-11-2013, 08:02 AM   #16
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Problems With Mildew on the Exterior of my House



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Old 04-11-2013, 08:07 AM   #17
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Problems With Mildew on the Exterior of my House


The quality isn't great, but it represents the problem. It's like this wherever they used the wood 1x2, which was quite extensive.

Like I said, I can clean it all off, and it looks nice and perfect for a few months.

I live in Mississippi. It's very humid, but it's not like this is a widespread issue down here.
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Old 04-11-2013, 09:38 AM   #18
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Problems With Mildew on the Exterior of my House


Every time I have ran across a mildew issue it's due to shading from trees being too close to the house. If you don't correct the shading issue the mold will just keep coming back.
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Old 04-11-2013, 10:38 AM   #19
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Half of the house is at least 100' from a tree. The other is 50-60'.

There is no discernible difference in the level of mold/mildew from the sunny side to the more shaded side.
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Old 04-11-2013, 01:11 PM   #20
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Problems With Mildew on the Exterior of my House


To my eye it looks like some type of sap-stain type fungus, which could be present, but not visible, in the sap grain of the wood before priming. This can be exacerbated by excessive moisture in the wood when it was shop-primed by the manufacturer. That would be one explanation for the abrupt difference of discoloration on some of those pieces, finger-jointed material being manufactured from different pieces of wood. Or, it could be from mold spores present in parts of the grain structure.

If the stock came pre-primed from the yard (which is normal with finger-jointed pine) then it wouldn't be visible to your painter. High moisture and humidity can exacerbate it, and moisture can build up under that porch, although it might not be visible to you.

I'm guessing at this based on my experience with finger-joint pine 2x4 re-sawn trim, which is becoming quite prevalent on tract housing out here in the west. Stuff I saw stored over a winter on an inside garage slab, with no good ventilation, developed similar patterns through the manufacturer-applied primer.

This is only a guess. Others may come to a different conclusion. Hopefully, you will get the answer you need, and a solution can be suggested.

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Old 04-11-2013, 06:54 PM   #21
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Problems With Mildew on the Exterior of my House


If the paint was the problem, all the surfaces would be growing.
If the environment was the problem, all the surfaces would be growing.
As clam has said, it's the wood, and it does look like it's growing through the finish.
Replace the trim or keep cleaning it. It's not uncommon for pre-primed wood to have a mildew issue.
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Old 04-11-2013, 08:15 PM   #22
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Problems With Mildew on the Exterior of my House


Look at your second picture, the closer-up of the two. Notice where your painter did his caulking between the 1x2 and the soffit material:

From the photo, it doesn't look like there is any discoloration on the paint over that caulking bead; in fact, it makes a distinctly white line separation along the edge of the 1x2 where it meets the soffit. This is especially evident on the underside of the joint where the two 1x2's meet at the perpendicular.

This is further indication to me that the problem is below your paint films, as the thickness of the caulking is retarding the appearance of the stain/mold. It would also explain why it has not reappeared as badly on the places you washed and re-primed/re-painted: it has an extra layer of paint to work its way through there.

As JSheridan said, if it were either the paint or the environment, which would locate the problem on the surface, I would expect that caulking line to be dark also (because it has been painted over) especially when the area immediately around it is dark.

You can choose to keep washing it; however, repeated washings with bleach will eventually degrade the paint film, including on those areas not turning dark (like that soffit) if you keep hitting it with bleach.

I don't know what contract law is in Mississippi; you may have recourse against the wood supplier/manufacturer because your place is less than three years old. In California, where I am, "Homeowners must file claims for the failure of paints or stains within five years of the close of escrow."

This might qualify as a paint failure against the manufacturer, but you would have to check it out with someone familiar with contract law in your neck-of-the-woods. I'm not certain it qualifies as strictly a paint failure (yet).
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Old 04-12-2013, 10:09 AM   #23
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Problems With Mildew on the Exterior of my House


I think what I'm going to do is just clean it again and try a couple more coatings in a some test areas and see what happens before I rip all that stuff out.
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Old 04-12-2013, 10:29 AM   #24
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Problems With Mildew on the Exterior of my House


hey Ford,
You might want to have a Porter factory rep come out and take a look at and get his opinion. That's their job, it's what they do.

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