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Author Topic: Big Case of Head up Posterior Causes Discovery of Mold, Mildew, Corruption in Sl  (Read 510 times)


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My storage bay under my bedroom slideout does not have a hook to hold it up so I have devised a hold open using an old mop handle.  Today I tried a new method of hooking the mop handle hole over the lock lever.  It worked real well.  Too well. 

Inside the 5th wheel we went to get it ready for our upcoming trip.  I needed the slides in so I could more easily get to the port side hub to replace a missing grease cap.  So in the slides went.  Unknown to me, my home made storage bay door mop handle caused the bedroom slide to compress the mop handle and caused the trim on the slide to separate from the slide box. 

After much cussing I took a look at the damage to see if I could do a repair and I discovered that the 3/4" chip board on the bottom of the slide box was wet, moldy and crumbling for about 10 inches from the edge.  So after more cussing I proceeded to remove the trim and at this point I have cut out to about 12 inches of the bottom chip board.  At the 12 inch mark the chip board has very good integrity.  Right now it is a ragged cut.  Tomorrow I will attach a saw guide and get a good straight honest 12 inch cut so I can replace the chip board. 

The chip board on the bottom of the slide is a few inches below a plywood base which is intact so the slide appears to be solid.  I'm sure the 3/4 inch chipboard provides some integrity for the slide box so I will be sure to replace the 3/4 inch chipboard with in kind material. 

The moldy, wet chipboard was covered with a thin paper like material approx. 1/4 inch thick laminated to a fiberglass sheet on the outer layer.  There were no weep holes or breathing holes.  I'm thinking that this water tight envelope is partly the problem that contributed to the wet environment that degraded the chipboard. 
Hopefully I have seen the worst of the corruption in the slide. 

So my thinking is to forego the fiberglass laminate and skin the chipboard with something like 1/4" luan plywood for breathability. 

2004 Keystone Challenger 33' Fifth Wheel
2015 Chevrolet 3500HD SRW
Belen, NM

Gary RV_Wizard

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Nothing much constructive in the way of thoughts, but you have my sympathies!
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL


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  • Western KY for now.
I would replace with marine grade plywood, and seal with paint or varnish - multiple coats - before install.  That should keep the water out of the board.  Finish with the trim of your choice.
Preacher Gordon, DW Debbie
09 Grand Junction 35 TMS  Progressive HW50C
Andersen Ultimate hitch
2013 F350 Lariat LB SRW Supercab diesel 4X4   TST TMS  Garmin 760
Nimrod Series 70 popup (sold)
It's not a dumb question if you do not know the answer.


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  • Posts: 184
minwax wood hardener is an excellent sealer for painting on plywood, osb, etc. It will also stop the rot from spreading and if it's not a load bearing spot you can fill with wood putty and hardener, but man for just plain sealing that stuff is awesome
Chaz (DH) Jill (DW)
2013 Ameri-lite Ultralite 259 BH
2008 Dodge Ram 1500 Crew Cab 4WD