Along the back of my house there is a gutter approximately 20' long. The lower end is coming away from the house. A couple of years ago I replaced several of the old gutter nails with gutter screws. The thread was a bit bigger than the shaft of the nail and most of them took fairly firmly. In a couple of places I had to move the spot it went into the soffit over an inch or so to get it to take. Now most of those screws are lose.
I fear that behind the aluminum cladding, the wood I'm attaching too is rotted but there is no other sign of water damage. Assuming I have something to attach to, what are my options? Bigger screws? Move the screws again?