Bumps on my wall

Discussion in 'General RVing' started by krsmitty, Sep 23, 2012.

  1. krsmitty

    krsmitty Senior Member

    About a month a go I started noticing these little bumps on one of my walls. Had it in for service a few weeks back and the repairman guy was calling it "Punkin". Says it caused when the wood under the wall paper has been wet. Not sure if I go along with that or not. There is no indication (water stains, discoloration) on the wall paper.

    Anyone seen this before?

    Attached Files:

  2. H2H1

    H2H1 Senior Member

    KEN is this under the paint on a fiberglass siding? I have the same thing going on on mine, but only in one color. I have been told it was the filter on the air tank for the painting gun. The filter was dirty and was not removing all the moisture in the air. And the moisture is trapt under the paint and it is trying to get out. I was told this by a fiberglass expert who repairs old corvettes. I hope this helps you under stand what it is. OH the only way to get rid of it is to sand and repaint.
  3. Grandview Trailer Sa

    Grandview Trailer Sa Senior Member

    Your service man is correct......water does it. You have a leak and your roof needs to be looked at.
  4. C Nash

    C Nash Senior Member

    Looks like an interior wall to me Hollis. Moisture would be my guess ken.
  5. H2H1

    H2H1 Senior Member

    could not tell inside or out, but that is what is wrong with mine
  6. Grandview Trailer Sa

    Grandview Trailer Sa Senior Member

    Hollis, if you have "bumps" on your interior walls....you have a moisture problem
  7. krsmitty

    krsmitty Senior Member

    Hollis...no, this is an inside wall.
  8. krsmitty

    krsmitty Senior Member

    Thanks...will do.
  9. krsmitty

    krsmitty Senior Member

    The bumps start about 2 feet up from the floor. I am thinking that it may not be the roof, or the bumps would be higher up the wall? It is right in the very corner, about where the outside brake/turn signal is...ummgh. Guess I need to get the caulk gun out. What is the recommended type of caulk/sealant?
  10. Grandview Trailer Sa

    Grandview Trailer Sa Senior Member

    OH....down low you just use Silicone Caulking.....if around your lights, take them off and look to see if you can see where the intrusion is.
  11. H2H1

    H2H1 Senior Member

    mine is on the outside on one color
  12. LEN

    LEN Senior Member

    I've seen the wet wall down low and no damage above several times. Most of the time if you look at the roof above the wet area you will find a vent solar panel or something screwed to the roof. If the RV has a seem at the wet area or a side to roof seem these are the first places to look. Best bet is to just redo seem seal and every possibility of water entry. I have seen one where the leak came from the rear and was inside in the front and only happened when it rained going down the road, added pressure from wind by moving down the road.

  13. krsmitty

    krsmitty Senior Member

    Hopefully...found the problem. There is a strip that runs along the top of the side walls that hold the roof membrane down. There is a channel inside the strip, where the screws are, that was filling up with water at the back of the RV. The strip was installed in 2 pieces and just butted up against each other and a little caulk to seal the join. I believe water was getting in where the join was and getting into the channel and filling up in the last couple feet of the channel at the back of the RV. The water could not drain out, so eventually started leaking into the wall of the RV around the screws.

    1. Put a lot more sealant around where the 2 strips join.
    2. Took out the last 6 screws or so that had a lot of surface rust on them. Filled each of the holes with sealant, cleaned the screws up and screwed back in, and put sealant over the each of the screws.
    3. The end of the strip was sealed up so that any water that got into the channel would fill up. Opened up the end of the channel a tad so that the water could drain out. But, hopefully there will not be any.

    Heading out this weekend to see if the channel is dry.
  14. H2H1

    H2H1 Senior Member

    good deal, sounds like you got it under control. ConGRATS
  15. JordanAllen76

    JordanAllen76 Junior Member

    Home Depot or Lowes would carry something that would work.. There products are generally very RV friendly. I don't see how you would have a problem using caulk from here. Also if it was on the roof, Home Depot also has that tar developed for weatherproofing roofs.

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