Shadow Catcher wrote:Use a labyrinth seal when extended a compression seal when closed.
I had to look up what a labyrinth seal was. Turns out I used a form of one on my hatch seals.
The sealing conundrum on a slide-out is not along the top and sides, but along the bottom. If you do as some RVs, and have the slide-out supported by slides mounted on the underside of the frame then you're okay. If you try to have the slide mechanism concealed within the slide-out and compression surface would interfere with the mechanism. It is also a similar challenge if the slide is mounted on the exterior of the slide-out.
Perhaps simplicity is the answer. The boxes for a teardrop-sized slide-out could be made relatively light which would mean that slides would not be necessary. You could make a flange around the inside of the slideout that would fasten to the sidewall and support the cantilever of the slide-out. Then you could use compression seals on the flange to seal the slide-out.
I wish I had the graphic skills to show what I'm talking about.