with Cindi. I have a hunch that you do not need to do what they call the "Minnasota Tip" method of winter protection in your zone 5 garden. It's simply extra work for you and will not be necessary to protect your roses.
As Cindi has suggested, it is wise to get advice from gardeners who actually grow roses in a climate similar to yours. Getting advice from those of us who are problem solving long distance doesn't really give you targeted information.
Good luck with your roses.