Gap between roof and front cap

When I redid the roof-wall seam on my last Beaver there was supposed to be a hardwood backing strip probably 3/4 by 1/2" beneath the joint and an aluminium strip on the outside. The assembly was held together with steel self-tapping screws which mostly had the heads rusted off after 13 years. I put them back with stainless 1/4 by 3/4" long self drillers. I put adab of caulk on each screw before insertion. The key things to know are that steel screws won't last, and at $10 for a box the stainless ones are cheap, plus the screws don't hold twolayers of fibreglass, so you need something to screw into. If it's that chipboard, you might get away with a coarse thread like a drywall screw in stainless, but a better bet is to see about inserting a hardwood strip behind the joint. The Key factor here is to keep the stress on any screw low enough that it doesn't fail. Good luck!

Based on what ihave read about the National plant, I'm thinking that it was built with the pieces not fitting and somebody decided the caulking was a "good enough" fix. Sorry!