Fantastic Fan Install - Page 2 - Fiberglass RV


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Old 01-29-2013, 10:28 PM   #15
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Starboard is a marine product and Ive used caulk on it with no issues. You can usually find it on ebay and then use a saw/dremel to cut it.

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Old 01-30-2013, 12:33 AM   #16
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It is my understanding that the FF folks can provide "gaskets" of varying thicknesses to be placed ABOVE the trailer roof, to keep the FF from intruding inside no more than a factory installation.

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Old 01-30-2013, 10:24 AM   #17
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Mike the FF will still send you the gaskets for free if you call them. But as was mentioned they are made of some type of foam. I decided not to use the ones they sent me as I didnt think the butyl would stick well to it in the long run.
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Old 01-30-2013, 10:59 AM   #18
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It sounds like the solution all comes down to using some sort of spacer, whether it be polyethyline, wood, foam, aluminum, or whatever else. I do wonder if the polyethyline would cut easily enough with a basic band saw. That may save on the fabricating cost. Wood probably would be easier to work with, but would it have the same longevity? It does, afterall, sit up on top where the weather will get to it.
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Old 01-30-2013, 12:35 PM   #19
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I received the FF I purchased from Vintage Trailer Supply last week (great service and good price). The paperwork that came with it said that if you need an additional spacer to call FF. I did and they're sending it to me at no charge. Its not just another gasket. The woman asked what color is the interior of the fan so they can match the spacer to it. Like others here, I'd prefer to have my spacer on the outside for the additional headroom, so I'm not sure what my install will be until I get the spacer from FF. I'll have to update you all later when I receive it.
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Old 01-30-2013, 01:18 PM   #20
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Otter, I think you will find that spacer FF provides is nothing like the spacers people are building. When You call FF ans say you have a thin roof, they are thinking only 1.25" instead of an 1.5" The super thin roof on eggs are a whole other level. Let us know, but I think You will still have significant intrusion down from the ceiling with anything FF provides. I spent a >lot< of time looking at this issue and talking with FF. Great company, great people, but they just do not provide an off the shelf solution.

The polyethylene sheet is durable and semiflexible. But I would not use it again I don't think. That Star Board sounds interesting. I just didn't want to use wood and risk water soaking in, rotting. But the polyethylene just rejects any adhesive, doesn't like most sealants. My set up is working great, but I'd do it differently if I had to do it again. At least I'd research other things. The milled poly sheets idea would probably work better with large rubberish gaskets rather than the butyl and caulk based sealing I used.

If the that super sticky roofing tape didn't stick I would have had a big problem. The first rain after installing my FF resulted in water just pouring in around the vent!! The tape is amazing stuff. Every egg should have a roll for emergency repairs. I'd cut small circles to go over leaking rivets until I had a chance to put caulk and new cap on. Works great.
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Old 01-30-2013, 02:11 PM   #21
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Thanks Dylan for the heads up about the FF spacer. I've wrecked my brain trying to think of a solution for a good material fo the external spacer. Still thinking. Yours looks great, but I'm glad to know upfront that it had challenges. Whatever I use I'm thinking I may just save myself some time and cover it with the roofing tape in the first pass. Everyone's sharing is priceless. I really appreciate it.
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Old 01-30-2013, 05:24 PM   #22
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I think this was mentioned already, but FF makes a high profile and low profile fan. The high profile fan sits higher on the roof. If you are in Canada, Trillium in Calgary stocks these versions and they are also factory trimmed. When I installed mine in my Trillium Outback it fit perfect, it's flush with my roof and the insulation.

It was also a clamp on version, so in theory you don't need screws, however the guys at Trillium told me they still use rivets or screws with that model and the clamp just supplies the added security that it won't come loose. I drilled holes in my fan to match the holes from my old vent, sealed with dicor, worked out great.
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Old 01-30-2013, 06:34 PM   #23
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Quote:
Originally Posted by multi-task View Post
I think this was mentioned already, but FF makes a high profile and low profile fan. The high profile fan sits higher on the roof. If you are in Canada, Trillium in Calgary stocks these versions and they are also factory trimmed. When I installed mine in my Trillium Outback it fit perfect, it's flush with my roof and the insulation.
Do you know how these two units differ specifically? If its just a different side panel that sits higher, perhaps I could just buy the part and upgrade my own fan? I am guessing that the only difference is the position of the lip that sits against the fiberglass roof?

Sadly, its not going to be economical to return this one. I bought it not knowing there was options. Now the cost to ship it back is too high.

I'm guessing that the best option will be a combination of things. If I make 4 x 1/4" changes for example, the fit will be near perfect.

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Old 01-30-2013, 10:17 PM   #24
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Originally Posted by dylanear View Post
The polyethylene sheet is durable and semiflexible. But I would not use it again I don't think. That Star Board sounds interesting. I just didn't want to use wood and risk water soaking in, rotting. But the polyethylene just rejects any adhesive, doesn't like most sealants. My set up is working great, but I'd do it differently if I had to do it again. At least I'd research other things. The milled poly sheets idea would probably work better with large rubberish gaskets rather than the butyl and caulk based sealing I used.
Dylan, to be clear, is the polyethlene material the same as that used in these cutting boards. Cutting Board 18" x 24" x 1/2" Poly White
I was thinking of cutting one of these down for the external spacer but it sounds like it may be the same material yours was made of. It seems like if you covered the top and bottom of the spacer entirely in butyl tape & firmly held the whole thing by the nut & bolt fasteners (tape, spacer, tape, fan) the rain couldn't penetrate, even if it didn't actually "stick" to the poly. Did it just squeeze so much tape out (because of the non-sticking issues) that it created butyl tape gaps in spots?
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Old 01-30-2013, 10:48 PM   #25
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Originally Posted by glamourpets View Post
Do you know how these two units differ specifically? If its just a different side panel that sits higher, perhaps I could just buy the part and upgrade my own fan? I am guessing that the only difference is the position of the lip that sits against the fiberglass roof?

Sadly, its not going to be economical to return this one. I bought it not knowing there was options. Now the cost to ship it back is too high.

I'm guessing that the best option will be a combination of things. If I make 4 x 1/4" changes for example, the fit will be near perfect.

Derek
That's what I was getting at. The low profile one is standard, the high profile sticks up more, I think about 1/2 or 3/4 inch perhaps? Never saw them side by side and dealt with this a long time ago now.

But if you need to make a riser anyway, the difference is not that important. Consider just getting the one that's cheaper and easier to obtain.
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Old 01-30-2013, 10:53 PM   #26
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Originally Posted by Otters View Post
Dylan, to be clear, is the polyethlene material the same as that used in these cutting boards. Cutting Board 18" x 24" x 1/2" Poly White
I was thinking of cutting one of these down for the external spacer but it sounds like it may be the same material yours was made of. It seems like if you covered the top and bottom of the spacer entirely in butyl tape & firmly held the whole thing by the nut & bolt fasteners (tape, spacer, tape, fan) the rain couldn't penetrate, even if it didn't actually "stick" to the poly. Did it just squeeze so much tape out (because of the non-sticking issues) that it created butyl tape gaps in spots?
Yep, probably similar material.

I think my leak was from too little sealant and yes, I think too much squeezed out when I assembled. Mine was further complecated in that I wanted more lift than I could get from one piece, so I used two and that added a gap to deal with. I'd avoid using butyl if I had to do it again. I really liked the Sikaflex caulks I used in various places (belly band!) and that stuff just would not stick to the poly. The more I think of it, the more I'd avoid that stuff (polyethylene)!
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Old 01-30-2013, 10:58 PM   #27
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Could try teak. Can usually find it on ebay if your not near a marina. Teak should be oiled and its the least likely to rot or just dry out since so little of it is exposed. I think the starboard though is your best bet. Ive used it in marine environments its relatively uv stable and calk will adhere to it.

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Old 01-30-2013, 11:05 PM   #28
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Another option, whyo dont you just sand down the gelcoat and build up the area with fiberglass cloth and 2 part epoxy, can make it whatever size you need, then just sand it smooth and paint it after you mount your fan?

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