RV Repair: RVfloor eplacement water damage, lumber yard, original materials

Question
I have a 2004 Adirondack Trailer.  I noticed the floor split at tech wall and dropped down from water damage. Tried to fix floor with materials from local supply area. when complete the floor seems to be spongy. would like to replace make stronger, replace with flooring with original materials.  where can I purchase materials or suggestions on how to fix.

Answer
Not sure what a tec wall is but the materails we use we most of the time get from the lumber yard. What makes me wonder is. That floor is it spongy because its still getting wet or just not supported. If the water was trapped in there then you still have problems. You may have to brace the bottom where you repaired it we have to do that on many jobs check it out and let me know or send me some pic if you want maybe I can see what you are truly dealing with