Originally Posted by Workaholic
Welcome to the forum Rick!
Out of those three I would vote for the 55yr elastomeric by Glidden. If you have big gaps that will contract and expand I would go with Big Stretch.
I would also never caulk the laps.
Thanks for the advice on the caulks. Why not caulk the laps - because the lumber may warp and open up the joint? If so, is this as much a problem with cedar, which is what I am using? Or? Thanks.