Unsupported floor joint problem, 1984 Chieftian

[britcardoc]

I have stripped out the old carpet to find 3 unsupported floor joints in the main walkway. The floor boards are good but the floor boards are butted together and are not backed up or supported.



They are a good 2 inches above the metal barrier below so i cannot back them up from below. The areas that flex are only about 2 feet long and are spaced 4 feet apart, the width of the plywood floor boards. Cannot put down new floor until I stabilize the butt joints.



surely someone has had this problem before.

[twinboat]

Maybe this kind of tool will work.

[britcardoc]

floor is only 1/2 inch thick

[Busskipper]

Originally Posted by britcardoc

I have stripped out the old carpet to find 3 unsupported floor joints in the main walkway. The floor boards are good but the floor boards are butted together and are not backed up or supported.



They are a good 2 inches above the metal barrier below so i cannot back them up from below. The areas that flex are only about 2 feet long and are spaced 4 feet apart, the width of the plywood floor boards. Cannot put down new floor until I stabilize the butt joints.



surely someone has had this problem before.

Need to get some support to hold the plywood from flexing - Usually another piece of plywood - say 6-8" wide for the entire length of the seam - I'd use Gorilla Glue and Drywall screws - Once it drys it should be just like solid Plywood. Remember Water is a Friend when using Gorilla Glue - I would drill out a couple of holes to get it pulled together tight then just Screw away .

JMHO

[Unplanned Tourist]

If you can't access it from below, cut a 2 inch strip off one side and slip the plywood with Gorilla Glue on it into place from above. Use a couple of long screws for a handle to hold it up, then pull it up into place with the drywall screws. Be sure to drill holes for the screws beforehand, so they won't push your support piece away.
Once the lower support is in place, just glue and screw the piece you cut out back into place.
Let the glue cure for 24 hours, and you will have a good solid joint with no flex.
Happy Glamping.