so cal racer-- what became the end of this? I'm at the same point in my build and struggling with the same question. It appears the section of the rulebook (3.B) is specifically addressing bolt in cages, but I don't see separate specs for weld in cages. I'm trying to get my fabricator (who really does know his stuff, came highly recommended, etc. Just hasn't built an SCTA car yet) to go with 1/4" pads, but his concern is that the unibody car we're welding this into has roughly .025" floors. Welding 1/8" plate to this is doable, and the plates can be nicely formed to match the contours of the unibody. Welding 1/4" plate to .025 material he says it not very safe because the amperage used to weld to the .025 is too low for good penetration on 1/4 plate but works fine on 1/8 if you pre-heat the 1/8 plate a little.
We're trying to build the vehicle to be safer than required and not trying to skimp, but having trouble digesting the rulebook on this requirement and if it applies to weld in cages, and if not what the requirement is and where it is in the rulebook. Seems like a question every car out there had to answer at some point.
What's everyone running on their cars that have been repeatedly passing tech for years?