How is a vent supposed to be attached to a roof? - Page 2 - Fiberglass RV


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Old 08-21-2010, 08:50 AM   #15
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Our basic question is how do you attach the plywood ring for vent installation to the ceiling? or do you just have someone hold it in place until you finish screwing down into it through the vent flange? I know, I know, we are so ignorant but we don't want to do this wrong and have more problems down the road....literally! Thanks for any guidance here.
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Old 08-21-2010, 09:20 AM   #16
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There is no wood framing on your 13' Burro, only fiberglass. You will have to make a wood frame to go on the inside of the roof to screw the vent into. You will have to screw through fiberglass down in to the plywood to secure the vent on top. Also the trim for the inside of the vent will also attach to the wood to make a clean look for the install. You can use a construction adhesive or have someone hold it until you have it secured with the screws.
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Old 08-21-2010, 09:46 AM   #17
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Originally Posted by Rose Feys View Post
Hi-we are trying to install our Fantastic vent fan ourselves, and I have searched the threads and there is often a reference to wood for screwing into, your photo and thread mention a plywood ring...was that ring something you added yourself? How did you affix it to the ceiling? We are scratching our heads , the factory customer service told us to build a wood trim to screw into , much like the threads I have searched here...but no one is saying how to affix the wood to the fiberglass ceiling...we are feeling real stupid right now. Can someone give us some advice, direction or encouragement?
Rose,
Make a ring out of 3/8" or 1/2" plywood that has the same dimensions as the flange on your fan. The flange sits on the roof (with putty tape between,) screws run through the holes in the flange, through the roof, and into the plywood ring. You end up with a sandwich, plywood ring on the bottom, then the fiberglass roof, then the flange sitting on top. A little hard to visualize, hope this helps. Feel free to email me with further questions.

Mike
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Old 08-21-2010, 10:19 AM   #18
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Rose, see Alf's post with pics (post #6) in this thread. It shows the wood you're talking about. FanTastic Vent - How To Install
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Old 08-21-2010, 10:33 AM   #19
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Great Thread as i need to install a Fantastic Fan into a Hi-Top Conversion Van and had no idea about the plywood ring inside..... I'm plenty handy and just need to be shown once and this really helped.

Paul who originally posted: I have to admit that silicone looks really sloppy and if you get no help from the installer maybe you could just go vertically with a razor-knife around the outside perimeter (being careful not to cut into the gelcoat) and peel away the outside of that cut to get a neater look.
Joe
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Old 08-21-2010, 10:37 AM   #20
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Thank you so much everyone!! We have been bickering over the installation for the last couple of days and your responses clarify it all...Thanks again! Now out to install it.
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Old 09-12-2010, 12:42 PM   #21
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Smile Fantastic Vent Fan is installed in Burro!

Wanted to say thanks to all, and to provide the update that our vent fan is installed, rain tested and is WONDERFUL! The interior wood trim frame worked like a charm and we are happy happy happy! Now to fix that pesky leak in the front window!
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Old 09-12-2010, 10:03 PM   #22
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Obviously they didn't think you would look on your roof.
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Old 03-07-2011, 02:04 PM   #23
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I made a wooden frame and siliconed it to the interior ceiling. Then I screwed my vent down from above. Pics here: The National Serro Scotty Organization
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Old 03-07-2011, 03:04 PM   #24
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Hey Nancy, thanks for sharing the link to your Boler. Wow, big improvement... looks very nice! When I first saw your message about using Silicone , but then I saw what you did . Glad you used it on the inside and not the outside... butyl tape there. Smart lady!
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Old 03-08-2011, 05:47 AM   #25
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Yes, was just using it to hold the wooden frame to the ceiling so I could screw into it from above. I never use silicone on a trailer - RV ProFlex if I need to seal anything and yes, butyl tape behind all doors, windows and vents. Having a fiberglass egg trailer is new to me - my other trailers are Serro Scottys, having done frame up rebuilds on two and soon to start number 3. The National Serro Scotty Organization and The National Serro Scotty Organization and The National Serro Scotty Organization
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Old 03-08-2011, 07:16 AM   #26
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Yes, was just using it to hold the wooden frame to the ceiling so I could screw into it from above. I never use silicone on a trailer - RV ProFlex if I need to seal anything and yes, butyl tape behind all doors, windows and vents. Having a fiberglass egg trailer is new to me - my other trailers are Serro Scottys, having done frame up rebuilds on two and soon to start number 3. The National Serro Scotty Organization and The National Serro Scotty Organization and The National Serro Scotty Organization
I looked thru your first link about your Scotty rebuild.......
You do extremely Good Work.
Joe
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Old 03-08-2011, 09:37 PM   #27
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WOW, great work and thanks for the links. You will do great with the Boler!

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Originally Posted by nkroes View Post
Yes, was just using it to hold the wooden frame to the ceiling so I could screw into it from above. I never use silicone on a trailer - RV ProFlex if I need to seal anything and yes, butyl tape behind all doors, windows and vents. Having a fiberglass egg trailer is new to me - my other trailers are Serro Scottys, having done frame up rebuilds on two and soon to start number 3. The National Serro Scotty Organization and The National Serro Scotty Organization and The National Serro Scotty Organization
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Old 03-08-2011, 10:20 PM   #28
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A friend in the fiberglass fabrication business uses a hot glue gun (Not the gun - the hot glue) to hold parts in place while tabbing or otherwise attaching them more permanently. Might work for the plywood ring.
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