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Message: <blockquote data-quote="Jeffrey" data-source="post: 300383" data-attributes="member: 10686">Tell me if this is important or if I am worried about nothing.  The aluminum hats that the ribs are made of have a height of 1.5" from the flange to the top of the hat, and the flange is 1/16".  So, the total height of each rib is 1 9/16".  If I used 1.5" square tubes or 1.5" channels against the bulkheads or between the ribs for additional bracing, it will be short by 1/16".  If that 1/16" was far enough away it wouldn't matter, but since it will be right next to the ribs there will be a small gap when I lay the sheet metal floor on top.  Do I need to fill this gap with something or will the sheet metal flex enough so that it doesn't matter?Next question, should I have the welder tack square tubing or channels for the additional bracing?  If I use square tubing, there will be a small but imperceptible gap below the channels where a film of water will collect, and if I use channel then the edges of the channel will be pressed into the hull.</blockquote>