Downloadable Resources
Backer Rod
Log Gap Cap
Grip Strip
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With flat or square logs, usually Grip Strip is preferred. With round logs, you can use either, but the round shape does help with the ideal hourglass shape bead, so keep that in mind.
There are many who will use a staple gun to staple the backer rod in a few places to help hold it in place. You can also use a few small pieces of clear packing tape or duct tape to help hold it in place.
That will depend on your joint size, but generally use one size smaller than the width of your joint. So, if your joint is 1/2″ wide, get the 3/8″ backer rod.
On flat joints, both duct tape and clear packing tape will work well. If the joint is less than 1/4″ wide, you won’t be able to fit a backer rod OR tape. Be sure to thoroughly flood those cracks and checks with stain and check them often (twice a year). Once they’re wide enough to accomodate a backer rod, seal ’em up.