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Open Roads Forum  >  Fifth-Wheels

 > screw lengths for outside wall penatration

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83trekker

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Posted: 06/07/12 02:21pm Link  |  Print  |  Notify Moderator

I am going to screw my backup camera on the back of my 98 5th wheel Kit companion. What length would be the best to use, i dont know how thick my walls are. Also just a regular wood screw good?

downtheroad

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Posted: 06/07/12 02:26pm Link  |  Print  |  Notify Moderator

Not familiar with your exact model but I would look in behind a cabinet where plumbing lines come in or in an outside storage compartment. You should be able to find enough exposure to see how thick the walls are.
My guess (don't hold me to it) is that 1 1/2" in (one and a half) length would be safe.


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sharker6

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Posted: 06/07/12 02:39pm Link  |  Print  |  Notify Moderator

You could also remove an existing screw from something like an exterior light and see what length it is.


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83trekker

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Posted: 06/07/12 02:52pm Link  |  Print  |  Notify Moderator

sharker6 wrote:

You could also remove an existing screw from something like an exterior light and see what length it is.


Thats a good idea.

The back of camera is feather light so it doesnt need heavy screws at all. I am also putting a drip cap over it. Should i put that gooey stuff around the screws like everything else screwed into my 5th wheel?

ScottG

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Posted: 06/07/12 02:59pm Link  |  Print  |  Notify Moderator

The immediate skin is only going to be 1/8 to 3/16" max thickness so you only need a very short screw. Also, I would opt for a stainless steel screw to prevent rust and help preclude leakage.


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Posted: 06/07/12 03:01pm Link  |  Print  |  Notify Moderator

Your probably just going into a thin fiberglass gell coat, so they won't need to be long.

Most of the factory equipment installed as a wood backer or additional fiberglass - so the length of the other attachments may be misleading.

83trekker

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Posted: 06/07/12 03:03pm Link  |  Print  |  Notify Moderator

Mine is actually aluminum siding.

jw of 4 corners

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Posted: 06/07/12 06:26pm Link  |  Print  |  Notify Moderator

Open the door and measure the jamb thickness, that is the wall thickness.


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Lov2hittheroad

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Posted: 06/07/12 08:40pm Link  |  Print  |  Notify Moderator

Go with a Stainless #10 3/4 sheet metal screw threaded the full length, can be found at big box stores. Also pre drill a pilot hole smaller by a tad then the inside diameter of the screw looking at the side profile DO NOT include the flair out from the thread just the shaft down the center. Smaller is usually better....fill the hole with silicone for water proofing. This is of coarse for a fiberglass exterior. If the rig is metal, go with a polyurethane adhesive. Can be found at big box or hardware store, comes in toothpaste size tube or caulking gun size. Where gloves, stuff is sticky as pancake syrup. Glue and then duct tape just the bracket in place over night. Caution once it is glued its there for eternity. Good Luck
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