Thickness of floor OSB in Bighorn Bathroom?

Need some info. The floor around the toilet is spongy, from a previous leak. I'd like to replace the plywood or OSB around the toilet with a piece of new plywood approx. 18" sq. I'm hoping to be able to cut the old floor out and have the plywood rest on the what I think is alum. channel. I might have to put some alum. angle iron on the sides of the channel to give needed support.

I'm the kinda guy that likes to get most of my materials ahead of time so I don't have to make 6 trips to Lowe's in the middle of the job, SO, my question is this, how thick is the plywood/OSB that is in there now? Does anyone have pictures of what that area looks like with the plywood/OSB cut out around the sewer hole? I'm probably not the first to have to do this repair.

BTW it's a 2012 Big Horn 3455RL

Thanks for any info you might have to share.

Re: Big Horn Problems

Mark, it's probably too late to help you but I just found a new product source called Sandhill Plastics that supplies recycled plastic sheets to replace RV flooring.

3/8 osb laminated floor system

sengli said:

3/8 osb laminated floor system

Click to expand...

It turned out to be 15/32", just under 1/2". Thanks.Mark