Home>Discussions>EXTERIORS>Do/Don't caulk cedar siding installed over rainscreen mat?
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guy48065
Re: Do/Don't caulk cedar siding installed over rainscreen mat?

Again, there are no gaps. The siding is butted up tight against the casings & posts. There are no vertical flashings other than the recommended tapes. There ARE drip caps above all the upper casings.
Siding was kiln dried, planed S2S, then stored on site in a shelter. Moisture content was checked with a Lignomat meter. I doubt there's much likelihood the wood will shrink but it may expand .1-.2% in length during humid months.

I'll update this in 50 years & let y'all know how it's holding up :)

HoustonRemodeler
Re: Do/Don't caulk cedar siding installed over rainscreen mat?

I'd like 5 year updates. Might not make it another 50....

ordjen
Re: Do/Don't caulk cedar siding installed over rainscreen mat?

Strictly from an aesthetics point of view, the cabin would look better without caulk because you probably would not find a caulk color to match your final stained wood. However, that being said, I don't like seeing end grain cuts being accessible to rain penetration. Granted, the siding is not the only rain barrier, and granted, the Sikkens stained cedar is very breathable.

Were a solid color stain or paint going over this cedar, I would caulk all verticle surfaces, if it were mine. Why let rain penetrate where not neccessary, even if there are redundant barriers underneath? With a solid color stain or paint, the caulking would not be obvious, as it would be on a transparent stain.

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