Self taping screws in roof

[Gearhead94]

I am putting a wall up inside of my bus that will go out to my covered porch. I know i will need to use self taping screws to screw it to the sides and the roof. But what do you do after that with the screw tips sticking up. Do I cut them off and silicone it or is there another way to do this.

[somewhereinusa]

Unless you are using really long screws, they won't go through the outside skin. On my Blue Bird there is about 2 inches between them.If you can screw into the rib (where the screws/rivets are now) it will be much stronger.