Attaching aluminium extrusion to side of motorhome

[jonasw19]

I want to attach a 3m aluminium extrusion to the outside wall of the motorhome.
This is to attach a driveaway awning.
The sidewall is painted aluminium, the extrusion is unpainted.
I have sikaflex 522.
The question is do I screw or not?
How long, extrusion is 1.5mm thick, plus 2mm for Sikaflex bead plus 1mm for the van skin so poss 6mm.
What material stainless?
2016, Hymer MLT620

Thanks for any comments
Jon

 

[GJH]

We used to use a drive away awning with our previous van. It had a J rail fitted but the awning had a tendecy to jump off so I bought a fitted a C section kit, similar to this one. It came with screws and a drill bit of the correct size. If I recall correctly the aluminium extrusion pieces were backed by double sided tape. I certainly screwed it, drilling carefully and then filling the holes with clear sealant before screwing the pieces on.
My notes at https://www.gjh.me.uk/mhnotes/awnings.htm

 

[Manic]

Ouy 2001 Hymer has an awning rail fitted to the side , don’t know it was bond but it definitely has self tappers every 230mm, top and bottom holding it.

 

[jonasw19]

I eventually decided on both Sikaflex and self tapping screws. We will wait 48 hours before using.
Thank you for your comments
Jon

 

[glenn2926]

The very last thing I would want to do is make holes in the type of vehicle that is renowned for leaking. This is the very reason I have not fitted solar as I do not want to drill a hole in the roof for the cables.

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