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Old 08-18-2018, 12:24 PM   #1
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Default Interesting Weathering Pattern

Attached is a picture of sun beaten Cabot solid stain on cement board on the East side of the house. It's gotten a lot of morning sun and rain for years. You can see the weathering pattern seems related to stud spacing.


Can anyone shed some light on this pattern with regards to the overall building envelope? I figure it's related to how moisture is moving through the walls, which is why the stud locations look different than insulated cavities, but I'm not an expert on this.



Any thoughts are welcome, and thanks!
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Old 08-18-2018, 03:11 PM   #2
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Its pretty common, even on interiors. I noticed in the stretching area of my gym, there is yellowing on a half wall, except for every 16" on about a 1 1/2" strip. I figure steel studs.

I think its a temperature thing. Where there are studs behind, it absorbs more heat. That doesnt explain the yellowing on the wall in my gym, but it would explain the picture you show. The higher parts of your picture probably gets less sun, less heat, less fading. Better quality paint will reduce that in the future.

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Old 08-20-2018, 09:43 AM   #3
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The root cause is a premature colorant fade. Use a higher quality, non-box store stain and you will eliminate this.Box stores sell cheapened paint AND use lower quality colorants than legit paint stores. By "legit" i mean paint stores other than SW, who use a high solids version of those low end box store pigments. It is a lower voc colorant but it is by no means a higher quality, more fade resistant colorant.
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Old 08-20-2018, 05:06 PM   #4
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Quote:
Originally Posted by Woodco View Post
Its pretty common, even on interiors. I noticed in the stretching area of my gym, there is yellowing on a half wall, except for every 16" on about a 1 1/2" strip. I figure steel studs.

I think its a temperature thing. Where there are studs behind, it absorbs more heat. That doesnt explain the yellowing on the wall in my gym, but it would explain the picture you show. The higher parts of your picture probably gets less sun, less heat, less fading. Better quality paint will reduce that in the future.

Looks like Thermal Bridging.
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Old 08-20-2018, 05:54 PM   #5
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Looks like Thermal Bridging.
that's the reason for it. But a paint with a higher quality pigment wouldn't show it as quickly.
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Old 08-21-2018, 01:10 AM   #6
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Global warming.
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Old 08-21-2018, 09:14 AM   #7
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Global warming.
Time to call "Al Gore painting" i guess!
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