DO NOT weld the holes closed.
The floor of your bus is most likely galvanized or galvanealled. Two separate methods of galvanizing but similar issues. Either way the surfaces have a zinc coating. Welding burns off the zinc creating toxic fumes as well as destroying the corrosion resistance.
For our build, Amazon provided plastic snap in plugs. Not the type pictured earlier but the type that snap in and lock in place without having a point sticking down. Polyurethane sealant on the plug, pop it in, and you're good.
For the screw holes from the screws that secured the wood flooring we purchased zinc coated steel (the most similar metal to the floor material to minimize any galvanic corrosion) blind rivets of the appropriate diameter and with "flange heads" (wider to give a better seal). Stick the rivet into polyurethane sealant and then set it in the hole.
NOTE: avoid stainless and aluminum rivets as the different metals will cause galvanic corrosion with the least bit of moisture and the bottom will be exposed to moisture plus all RV's tend to have high humidity levels at least intermittently.
Steel rivets might be okay but zinc coated steel rivets are relatively inexpensive and should be the best match on the galvanic scale thus the least likely to result in corrosion.
Perhaps I'm anal about dissimilar metal (galvanic) corrosion issues because of my aviation background but I've seen dissimilar metals really eat up what was once a very solid assembly. It's a large part of why electrical systems require specific certifications if there is aluminum and copper contact (and alox inhibitor).
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We've done so much, for so long, with so little, we now do the impossible, overnight, with nothing. US Marines -- 6531, 3521. . . .Ret ASE brakes & elect. Ret (auto and aviation mech). Extra Class HAM, NAUI/PADI OpenWater diver
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