Maybe this thread of what you are looking for:
viewtopic.php?f=3&t=633Sorry about your problem. It won't be too hard to fix, thankfully. Just use a few layers of fiberglass to reinforce the joint.
I had an issue there but NOT with bulkhead separation
per se. During heavy winds, the tabernacle flexed the plywood enough to cause the (rigid) cleats attaching bulkhead-to-roof to separate from the wood. The bulkhead-to-roof plywood joint, which was reinforced strongly with fiberglass and epoxy, never budged. To fix it the separated cleat, I pushed in epoxy to the joint, then added a plywood doubler and beefed up the bolts and washers to cut down on the flex of the plywood. I also significantly tightened my shrouds.
John Harris has come out forcefully against the need for a doubler to reinforce bulkhead 2. I think he is right. In my case, the shrouds were not tightened down enough - something I didn't appreciate the significance of. Had they been tight, I wouldn't have had the issue. When I finally stopped to consider the physics of it, I realized that the shrouds stop the mast from moving forward (and I guess then push the force downwards). If the mast can't physically go forward anymore, then it can't cause bulkhead separation.
I have since removed the silly triangle part of my doubler, but still use the wider oak plywood piece. I have never once had any more issues there, including in stronger wind conditions than I had when the problem first occurred.