The facia boards on my (single story) house are rough sawn 2 x 12.

Due to constant sun exposure (Southern California) the boards have developed
cracks and fissures, some 1/4" wide, 1/2" deep and 5' long.

I have patched the cracks with exterior caulk and repainted them. However,
due to the different rate of expansion between the caulk and the wood, the
caulk keeps popping out.

Due to the deep cracks, the boards have developed some dry-rot, which I have
repaired successfully.

How can I get the caulk to stay in the cracks? Replacing the boards would be
a major undertaking.

Thanks for any help

--
Walter
www.rationality.net
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