Replacing Floor

[gmflash88]

So after getting seats and plywood out, my floor is toast. The perimeter was rusted out and it was corrugated. So I ripped it all out and sent it to the scrap yard. Now I'm cleaning, remediating rust, and going to replace all the U bolts strapping the body to the frame.

My intention is to screw on new angles along the perimeter (the bottoms of those were rusted out too) and just put all new, flat sheet galvanized in once my rust cleanup is done. Above that will be rigid foam and then T&G plywood.

With all that in mind, is 20ga steel good enough?

[o1marc]

20 will work ,but for a floor I might use 18, though with plywood going over it, it should be fine.

[ewo1]

Originally Posted by gmflash88

With all that in mind, is 20ga steel good enough?

20ga is to thin, will flex a lot.
18 ga ...mmmm...if I had too....

Me personally, for the floor I would use 16 ga.

I used 18 ga on my skins and also for the roof transition.

[GWRider]

I would use 16ga for floor if using thinner plywood. I used 16ga for sides but would likely do 18ga if I had to do it again.

[gmflash88]

Originally Posted by GWRider

I would use 16ga for floor if using thinner plywood. I used 16ga for sides but would likely do 18ga if I had to do it again.

My intention is 1-1.5" rigid foam and then 3/4" TG subfloor. Would you still do 16? The difference in cost would be about $100 total from 18 to 16. Considering what is being spent on the conversion, what the heck is another $100 lol. However...$100 is $100.

[Mercuric Mind]

Originally Posted by gmflash88

is 20ga steel good enough?

I think 20ga is too thin and it will flex and give you no end of trouble down the road. I had to replace part of my floor over and around the rear wheels and when I measured the existing metal thickness it was 14ga. So I replaced it with 14ga galvanized on top of welded tube sub-frame clamped to the chassis frame. The sheet metal was spot welded to the sub-frame.