Screws to attach vent to aluminum roof?

Discussion in 'Roof/Floor Repair & Maintenance' started by Benjamin Lee, Oct 3, 2021.

  1. Benjamin Lee

    Benjamin Lee New Member

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    Hello everyone. I am trying to finish up our roof rebuild and am trying to get some insight of the best screw type to attach the air vent to the roof? I have seen where stainless can create issues when attaching to the aluminum roof. What should I go with? A pic for reference. 2000 fleetwood Sedona.
     

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  2. Sjm9911

    Sjm9911 Well-Known Member

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    Is the vent aluminum or plastic?
     
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  3. xxxapache

    xxxapache Well-Known Member

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    My whole trailer is aluminum. My vents and much of the hardware came from the factory attached with stainless screws.
     
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  4. Benjamin Lee

    Benjamin Lee New Member

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    It’s aluminum with plastic cover. Pic below. Vent line brand.
     

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  5. Sjm9911

    Sjm9911 Well-Known Member

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    They have aluminum screws, but i think most places would use zinc plated, that look like stainless but aren't. I looked up vent line on amazon, it says galvanized flange. Tbh, dont think it matters much. Drill a hole , and the screw bites into the wood and really dosen't touch the aluminum to do much. Set it in the brutal tape, caulk and be done with it. Dissimilar metal stuff happens, but i dought it will effect much in your application. If it was like galvinized and copper sweted pipe, i would be worried. But it isnt.
     
  6. Benjamin Lee

    Benjamin Lee New Member

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    Awesome. Thanks for the insight. I just went ahead and got stainless sheet metal screws. I’ll roll with it that way and just seal up well
     
  7. xxxapache

    xxxapache Well-Known Member

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    Put sealant on the screw threads before you put then in., then on the heads when done.
     
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  8. Benjamin Lee

    Benjamin Lee New Member

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    Wrap butyl tape on threads?
     
  9. xxxapache

    xxxapache Well-Known Member

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    No...use RV caulk.
     
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  10. pm3579

    pm3579 Indiana U.S.A.

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    No don't punch holes in a perfectly good roof. 30 years in roofing I can tell you where it will leak first. Sooner or later all penetration's will leak.
     
  11. Sjm9911

    Sjm9911 Well-Known Member

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    I have to ask, how would you suggest he holds the vent to the roof then? I have yet to see a roof vent without holes for fasteners? Even in roofing, you need to screw or nail down a vent? Caulk and tar only goes so far.
     
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