Venting cedar siding


Old 08-05-08, 08:31 AM
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Venting cedar siding

I have a house that has bubbled alot of the paint on the cedar siding. Benjamin Moore has been out and says that the cedar siding has to be vented. Any ideas? I have heard of sticking shim wedges under the siding at various places. Is there anything else that can be done?
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Old 08-05-08, 11:14 AM
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Welcome to the forums!

The best way to fix the moisture problem is to install a vapor barrier on the inside........ but that requires removal of the interior walls

On older homes without a proper vapor barrier, it is recomended to use all latex primer/paints. Moisture can travel thru latex better than it can thru oil base. Cedar presents a problem because of tannin bleed which needs to be sealed with good solid coat of oil base primer.

I have also heard of shimming the lap siding but don't recall ever painting a house where this had been done. Are there certain areas of the house that the paint bubbles more than others?
Old 08-05-08, 01:28 PM
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No. The siding is mainly in the rear of the house, except on the second floor, which has some sidingon the side. Most of the house is stone ( the front and 90% of the sides ). The house is between 10 and 15 years old. The peeling/bubbling appears randomly on the siding. Where it is peeling/bubbling it is not just a little spot. It's at least 4 - 6 inches in each spot.
Thanks for helping,

Old 08-11-08, 06:07 PM
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Before going further, give those paint guys a credibility check. I had a standard latex paint over my cedar siding for 15 to 20 years with no problem. Then I scraped and sanded it, primed any bared wood, and repainted it with a fancy 100% Acrylic Latex paint. Same siding, but the paint blistered like crazy. When I cut away the blisters it appeared that the new paint just would not stick to the old paint where it was sanded thin. Not quite bare wood, not quite a thick undercoat. But the blisters ballooned on a warm day, then sagged when cool. Ugly! So I'm cutting away blisters, sanding the edges, priming heavily and repainting the spots. Then I'll give it all a new topcoat. My fault? The paint's fault? Dunno, but it's not the fault of moisture in the siding or the previous coats would have bubbled long ago.
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