Looks like they originally use the thinner fiberglass cloth and the flex of walking on the floor has made it let go at the edges. I would use the heavier fiberglass cloth and resin over it to repair but would wedge something between the ground and the wood rib before doing the repair to take out the bow in the ribs.
Originally Posted by zelljim
I have posted some pictures showing my problem with the ribbed fibreglass subfloor separating from the ribs. Any suggestions how to repair this.? Thanks. Jim