Cemplank or Hardiplank installation question
I have HardiPlank siding on my home. It is 6 years old. The joints between planks on my house also cracked within a few months or a year. I dutifully picked all the caulk out and resealed them. However, they soon cracked again. After discussing with the manufacturer I found the recommendation to be "To follow the caulk manufacturer's installation guidelines". Meaning that the caulk typically will not adhere well in a butt joint, and the caulk certainly needs a minimum gap to be effective. A very narrow joint of 1/8" or less is too small to get an adequate bead of caulk in. The better method is to use some type of flashing behind the joints to help shed the water. My house had several problems with flashing, house wrap, design, drip guards, etc., so that now I am faced with tearing the back side of my house off to fix all the rot.