It takes a lot of water over time to rot out wood. Difficult to imagine how a tear in the underbelly would precipitate that. I'd look for a leak coming from somewhere above.
Otherwise, if it's a soft underbelly, there a product called " Bottom Board".which comes in rolls ( 3' or 4') and is attached by spraying both surfaces with an adhesive. Any Mobile Home Supply house will stock it.
Holdmybeer, thanks for your suggestion, I see this membrane product on Amazon and also know someone in the mobile home industry that will be able to help.
The rotted wood was factory wrapped 3 sides in underbelly membrane.
The membrane was worn thru at all frame contact/fastener points on that side. I think any water that entered during rainy tow events got wood and insulation wet and was never able to dry out. We get 40"+ anual rain/snow and high humidity part of the year in Missouri. The camper is covered with a quality cover in off season and parked in an open area on a gravel pad. These boards were completely rotted thru for entire length in front of and in back of the wheel. There was no insect damage.
These are the 1 5"x 1.5" boards on the sides that bolt to the frame. 5/8" OSB subfloor covers that over the whole floor, then the vinyl flooring, then the walls with their own sill plate are screwed thru the OSB, to the sill plate that rotted,
I have some OSB floor rot also, but fortunately that is only a few small areas.
All wood above the vinyl flooring looks lumber yard new. I always kept the roof and side intrusion points sealed with Dicor products. Water travels, could have come from above but no sign of this that I can see.
So all- WARNING-be aware of possible leaks from below as well as above!! Especially with a soft under belly.
Some membrane tears at fasteners appeared to have been there from factory.on this 2017 hideout.
Unfortunately was not noticed until damage done.
I plan to replace rotted sill with Douglass fir 2.5" wide. Was told not to use treated lumber on campers due to possible toxic fumes.
Am I the only one to experience this issue?
If not fixed would no longer tow this down the road after my findings. I originally noticed the issue because the rear siding was not in line with the rear bumper, the rot had allowed settling on that corner, and some of the fastener nuts were loose.
