If you're asking me peeps, I staple the screen to about 3/4" from the tree trunk, so it's not TIGHT. I do that at top and bottom so there's a little " wiggle room ". My screen bottom is about 3" below the stone chips which - in our circumstance - deters mice/voles from tunneling into the bottom of the screen. As the tree trunk expands in girth, it'll work the staples loose and make it's own room. I periodically check our trees anyway so if a staple needs a little " help " I can pull it out. No headaches, really. I learned this method from other guys on this forum and another forum. The apple experts that have been doing this for a while get the credit. Guys like Stu, Maya, NH mtns., Aero, Crazy Ed, Benhpr, etc. I've been planting apples / crabs for a few years, but I can tell you the system I learned from these guys WORKS !! I also learned some of the same tips from a local orchard man near to my camp.