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Old 06-05-2007, 09:25 AM   #1
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Painting Clapboard


Part of my house is clapboard. It needed painting for a while, so I started last summer, did the front (stucco) and one side (clapboard). I pressure washed everything, scraped and sanded the chips and bumps, put on a good oil primer. Painted the clapboard, looked great.
After one winter, 6 months after painting, there are several large bubbles where the old paint was. It's from moisture underneath the boards, condensation, all that.
I learned that the overlaps need to be open-- I had thought for airtightness they should be closed-- after 70 years, the buildup of paint had sealed them very nicely.
Now I have to redo that side. I need to prep the bad spots, including any cracks, sand them (random orbital sander), and pop out the clapboards and shim them. Then repaint.
MY QUESTIONS:
1) I want to use cedar shims (I've cut my own, 3/32"). Will the shims bleed down the paint after time? Is there another kind of wood I should use?
2) Should I use a different primer? How far under the laps?
3) Any other tips?

Thanks.
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Old 06-06-2007, 03:33 PM   #2
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Painting Clapboard


Was this a "summer home" that was "winterized" at some point?
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Old 06-06-2007, 06:21 PM   #3
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Painting Clapboard


It's a sturdy 1930's era colonial, well built and solid. Not great insulation, tho.

Last edited by BilHam; 06-06-2007 at 06:22 PM. Reason: mo' betta
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Old 06-06-2007, 09:25 PM   #4
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Painting Clapboard


If there's no vapor barriers, and the attic (and other) vents have been sealed to help insulate or keep drafts out or warmth in, you could have a "wet house"...especially if you are anywhere near the water
The living area can be airtight, but the attic has to flow

If that's the case (that you have a wet house) any oil products will peel within a year, usually within months
A latex solid stain (rather than a paint) is often the go-to coating for those

If any/all of the above descriptions fit your house, it might be worth testing with a moisture meter

I don't know about the shims
Sounds logical though
And if they are cedar, then they could bleed, yeah
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Old 06-07-2007, 10:06 PM   #5
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Painting Clapboard


Sorry to hear about the problems, and I hope you well with your project. I am not a pro, I pretty much read a lot, and learn as I go.

I am in the process of painting my house myself, and the clapboards are almost all sealed, and they have been that way for years. Is there EVER a time, that house clapboards can be sealed? Also, I have been closing in the corner boards, to prevent the termites from getting a good foot-hold. Is there a way to do this without causing a problem?. My attic is open with pleanty of ventilation, and there is no insulation in the walls.
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