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.
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?
Was this a "summer home" that was "winterized" at some point?
It's a sturdy 1930's era colonial, well built and solid. Not great insulation, tho.
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
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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