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OFDPOS's avatar
OFDPOS
Explorer
May 01, 2015

Installing Fantastic Fan And Others

Was watching the RV flip show (the one with the young couple up in Oregon) the other night and they were totally redoing a Bambi trailer.

When they went to install the fan the guy just squirted a bead of what looked like clear silicone then set the fan in place ,then some screws.

I realize for time they just show as little as possible of actually doing anything , but thought that was a little odd ?
Anybody else do the just a bead of silicone?

When I did both of mine:
Tested both fans before even starting the project !
I scraped as much of the old sealant I could get off the old screw heads , remove the screws , remove old vent, then go to work removing the old sealant, once that's all cleaned off , set the new fan in place go inside check to see that it is centered in the whole and plenty of room for wiring etc.
Go back up on top mark all 4 sides of fan lip on roof.
Flip it over ,pull out the butyl tape cut pieces to butt up all the way around , remove the tape paper , flip it over, set it down lining up the marks.
Install the screws and other pieces for the fan cover , go back down inside and wire up the fan , cut trim piece to fit flush and install the trim piece .
Go back up on roof recheck all the screws , by now a little bit of the bytle tape has oozed out , I then use the self leveling lap sealant and put a bead all the way around on the edge so it can self level over the edge and settle on the roof sealing up , then go over each screw head with a dab and it flows right on into the first bead I put on.
Went back out following day and look over the install and the lap sealant has self leveled and looks nice and clean.

Still thought it was odd using the silicone ??
  • I saw that show. I am pretty sure they were using Dicor sealant and not silicone. That said I would not use Dicor either as a sealer betweent he vent and roof. I have used Butyl tape and double sided 1" Eterna Bond Tape between the flange of the vent and roof. I think I like Butyl better, it's just simpler. On top of the flange I am generous with Dicor self leveling sealer....

  • These folks know what they are doing- keep in mind, a vintage Bambi Airstream is not going to be the same as a regular rig. Vulkem and Parbond are the sealants most commonly used on Airstreams- butyl tape is far to thick for the small joints on these rigs, and while it would work on a roof vent, it isn't needed.
  • Ron3rd's avatar
    Ron3rd
    Explorer III
    I saw the show the OP is referring to, and IMO those folks know what they're doing. Yes, I was surprised to see them lay down a large bead of "something" from a tube, but they did not say "silicone". I've always seen these types of installs with butyl tape followed by self leveling dicor on the top, but who is to say if these folks choose to do it a different way, they are wrong?
  • Old-Biscuit hit the nail on the head. Sloppy workmanship just to make the RV look good and the poor person who purchases will have all sorts of problems caused by leakage. And if they go to remove the fan and redo it, they will be fighting silicone and the residue that is left behind that nothing sticks to. Silicone is something that should never be used on a RV except in dire emergencies. That is why I carry both dicor caulking and a roll of butyl tape.
  • "RV flip show".........pretty much says it all.

    Redo enough to 'look' good then dump it on somebody.