I'm about to remount the original 1" aluminum tubing roof rack that came with my 2001 Grandby. I had to repair it after the original owner apparently snagged a tree limb. (Embarrassingly, I am that original owner <sigh>.)
Is there a functional difference between using self-piercing (sharp piercing tip) and self-drilling (cutting blades on tip) screws on the roof? Does either one hold better? The factory used self-piercing screws, but that could have been for manufacturing efficiency. I intend to put butyl tape under the rack to prevent leakage that might lead to corrosion.
Many thanks for this help and for the help you collectively have provided before. With your help, I've installed new factory lift panels and lift cylinders, repaired broken frame members under the front window, fixed torn siding, fixed rotted plywood, and more!
Kevin in San Diego
Edited by Dr Paddle, 04 March 2022 - 08:41 PM.