Caulking the horizontal joints will not really help.
The natural expansion and contracting of the wood will break any seal you get from caulking.
Sealing the ends of the cuts is good. This will prevent the wood from wicking up moisture in the end grain.
It sounds good to me!
Thanks for keeping us posted!
Tom
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I really appreciate your professional advice. Well the update is i got more of the three story west wall painted...of course using a taller 22 foot ladder borrow from my neighbor.
So using a spatula which has a thin flexible blade...help to get rid of the loose flaking paint. I then used a disc sander with 40 grit sand paper to attempt to feather the rough edges some... Then lightly over with quick dry primer in a spray can on the bare wood...And finally brush the Kelly more matched paint on...whew! Oh yes and caulked where it was needed.
Got up to three planks above the second story window...will need a 32 ft ladder to get the remaining 8-10 feet of the third story...
Well thanks for your help guys...got two guys with two 32 foot ladders and changed out about 30 feet of plank...InspectorD...i like the idea about the tar paper z sealing...
After the planks were replace and although they had been prepainted with oil base prime and kelly more matched exterior paint...i painted repainted the whole wall my self with my neighbor's 22 foot ladder...using a putty knive...i got all the loose paint off and then used a disc sander to take the edges down...sprayed prime out of a can the bare wood and then brushed on the final coat all in one step.
Since the house is three stories up...what i could'nt get with the a brush..i used a long extention pole with a roller and rolled the sections hard to reach...standing on the two neighbors roofs whose houses are built side by side to my corner house...
Now i am on another problem ...of course with this house...