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Old 07-07-2013, 09:27 PM   #1
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2 X 4 floor supports rotted off at rear

My 73 24ft has the very end of the 2x4 supports that run the whole length of the trailer rotted off right at the very back end. I am replacing the sub floor and want to find a way to repair them. What have other done in this situation? I cant see replacing the whole length of 2x4 so I was thinking maybe I could weld a bracket next to the original ones since I plan to repair the cross member at that location anyway and just replace the very last section of the 2X4.
Here are pics.
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Old 07-07-2013, 09:40 PM   #2
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If you can weld a new bracket, then sistering the 2x4 should not be an issue. Just make sure the sister is long enough to take the weight.

Have you considered swapping wood for metal?
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Old 07-07-2013, 09:50 PM   #3
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Quote:
Originally Posted by andreasduess View Post
If you can weld a new bracket, then sistering the 2x4 should not be an issue. Just make sure the sister is long enough to take the weight.

Have you considered swapping wood for metal?
I was thinking that maybe an option as well . Just cut off the 2x4 at the last cross member and weld square tubing across the last section to replace the old 2x4. Now I am thinking I might also want to investigate installing a new set of tanks since it only came with a black water tank. If that's the case this would be the time to change the rear section set up anyway. Then the term "opening up a can of worms" popped into my head.
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Old 07-07-2013, 09:51 PM   #4
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Yea, metal would be a better choice. Also it looks like main frame rails are rusted through at the bottom. You can get angle iron or flat plate to help reenforce them, if you don't have the time or money or will just to replace the whole frame rails. You can bolt on metal to reenforce them.

You can look over my posts "rear end separation short term fix". It goes into fixing rear end issues and welding risks.

If you don't want to weld, the you could always drill threw the main rails and you angle iron and bolt them together. That should provide some added strength.

Good luck!
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Old 07-08-2013, 07:17 AM   #5
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Another choice...

Cut 2/4 back past bad part on an angle of 45 degrees. This will give you more"glue face" and Strength.

Put new "sister" as discussed.

Now, glue another piece of good plywood on the bottom of the seam from 6" back from seam to the bracket on frame and "saddle" it around front and rear of metal bracket but do not touch the frame.

This will help stabilize the end of 2/4 and spread load.

I would use something like P2000 construction adhesive for glue... Comes in caulk tube. Make sure you PREDRILL & "glue-n-screw" together!

This way you can construct the "sister patch" and plywood doubler before joining to existing 2/4 stringer. It is easier than trying to hold all pieces in alignment and glue!
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Old 07-08-2013, 08:47 AM   #6
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So after a night to sleep on it I have a new option. I was thinking I could weld or bolt a new bracket on the front side of the cross member forward of the bad section and then cut the 2x4 to match the new bracket then I can just replace the section between the last two cross members and be done using the original brackets. Here is a drawing ...please pardon how rough it is.
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Old 03-12-2014, 09:00 PM   #7
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The fix

Here is what I ended up doing. The rear cross member was rotten as well as the hold down plate so I replaced the rear cross member and the hold down plate as wells as the rear section of 2X4. I made the hold down plate out of stainless and had to replace a section of the outer skin that was destroyed by the metal to aluminum interacting. I also replace the floor of course.
I reconfigured the rear skin with an extra piece of aluminum to make a divider to stop water from running off the trunk lid and under the skin in the tail section to prevent tail rot down the road. The factory set up was ridiculous.
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Old 03-12-2014, 11:15 PM   #8
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Looking good! What did you use to paint the rails?
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Old 03-13-2014, 06:06 AM   #9
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The original frame parts got a coating of POR15. I use automotive primer and paint on the new metal.
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