Here’s what I say about it:
“The fiber cement siding, which may or may not be HardiPlank, was not sealed at the plank ends where they terminate at corners of the home. Vinyl trim was used and we were able to determine that the ends of the fiber cement siding are open. There is a potential for water to enter the wall system at the corners and long term damage to concealed areas may occur. To the best of our knowledge, the manufacturer makes no allowance for use of vinyl trim. Indeed, they go to great pains to ensure that the wall system is installed in a water-tight manner. We recommend a further evaluation by a 3rd party licensed general contractor and service as deemed necessary to ensure that the siding is installed consistent with the manufacturer’s installation instructions. An installation instruction document from a leading manufacturer is attached for your information.”