Repairing rotting floor - are squares OK?

Dr Quick wrote:
When I have replaced any floor joist I like to predrill new add on joist, then use deck screws to attach to exist solid joist. That way the new joist will pull tighter to exist. Used this technique on three different trailers in floors, walls and roof joist. All repairs have held up well.

Thank you. One thing I've been thinking about is how to eliminate it squeaking. Sounds like your solution would work.

owenssailor wrote:
That should work fine. I'd also add where you indicate in blue.
One more comment - why did this area rot? Have you found and fixed the problem?

Yeah the original problem has been fixed. The water damage was pre-existing, and the only conclusion I can come to is that the previous owner was lazy.

There wasn't a leak that caused the water damage. We bought it in the northwest, and apparently it was being used in rain a lot. Water would run down the outside of the slide and eventually the bottom of one side of the slide would get wet. They were bringing it in without wiping it off, it was dragging water onto the carpet, and they did it enough that it soaked into the floor and caused all the rot that you see. I'm just thankful that the fiberglass insulation kept it from spreading into the rest of the floor.

I just don't understand how you could be so lazy. They had to have known it was happening. They could have avoided the whole problem by taking 30 seconds--literally--to run a towel under that corner of the slide before bringing it in.

Here's a link to my original post about it - http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28207571.cfm. I ended up having the dealer do the initial repair since that corner was completely rotted; they had to lift out the slide. Unfortunately I didn't realize how far the problem went. I always look on the bright side, though; at least I can repair this section myself without involving the dealer!