Pmullen503 wrote:OK, steel frame covered with fiberglass panels.
You plan to insulate later, right? So you could use polyester filler because there is not foam near it while it curing. I'd still use resin + glass cloth on all the corners to make sure it never leaks.
What were you thinking for the interior surfaces?
For people without the metal working tools and skills SIPs might be easier. I was thinking more along the lines of SIPS.
I'm still working through how much steel I need vs. SIP. That over-hang (my loft over the cab) is the reason for steel structure. If not for the 'loft', this would be a SIP build. Like my original build, the panels will be between the steel ribs. What I learned was the 1.5" foam was more than enough to go through mid 20F with evening/morning heat (my little Buddy heater). Most times, 30F or above, just making coffee did the trick.
Still awaiting warmer temps to start experimenting on joints. I do figure FG seams no matter what, but my do some rubber style gasket on corners to help. Again still working through this..
The biggest issue with 1.0 build was how the edges between the steel and the inserted foam reflected through. Not sure I'd require anything with these panels I hope to use, yet if I can reduce 'any deflection with filler, I would like to do so. The file would be between the steel & XPS foam.
I've done an edge test on a home-built SIP and was very impressed! My cousin and I did it with a 24" tall and 1.5" thick FG'ed XPS panel. When we cut it down to possible spanners.. it's deflection as became too great. Meaning as joists, not so good for hope for weight. If you know of anyone or other info accordingly, lease pass along. I'd love to removed all this steel for the build!