james hardie

I have a few outside vents that are no longer needed, so I will be having them removed and putting siding over the opening. This is Hardie siding on a home built in the 1990's and does not have house wrap under the siding, so Hardie is attached directly to the sheathing. How should the opening...

Should/Do most contractors who install James Hardiplank have go by the manufacture's installation guide or can some come up with their own method of installation. I feel like they cut corners :whistling2: just to get the contract and I want the warranty to be valid once they complete the work...