Any suggestions for how to roll a sail for maximum life?



I have a Technora main that I roll from head to foot, paralllel to the battens after loosening all of them. The thin stiff clear film window at the base is thus the outermost roll with the largest radius of curvature. I keep the rolled sail in its sail bag horizontally in a dry place.



Others I've seen roll from foot to head, and still others fold the sail below the numbers and roll from the crease.



My sail shape still looks good, but I notice some small delamination wrinkles at the head.



And is having the sail washed at a loft once a year sufficient?



I appreciate the expertise of this experienced forum.