King Starboard as Camper Shell Material?

Sportsman Matt

Adventurer
Howdy all, I've been reading a lot of posts on this board since I found out about it a few months back. This is going to get long winded but will bring everyone up to speed on the issue at hand.

I'm currently working on a small slide in truck camper for weekend fishing trips, the plans came from the 1955 Popular Mechanics Do It Yourself Encyclopedia. A simple box style, no fancy overcab sleeping area, just a 8 foot long box with windows, area for a chemical toilet and stove, some bench seating and a standard bunk across the front of the camper when needed.

The dilemma comes in the exterior materials. Some prefer aluminum, some filon or fiberglass, and the plans call for painted hardboard over thin plywood. So I was thinking, if I made the framework out of aluminum tubing or C Channel instead of the recommeded steel, The frame would last for a few decades. Then I thought about what I saw when working for an RV dealer in their repair shop, mainly leaking seams and lots of rotted plywood and moldy insulation.

Now knowing what plywood can and can't do, plus the plywood in my current camper is becoming dry and brittle after 20 years of service, I am looking at this in a different direction. I found King Starboard, a composite marine material, and it's equivalent, available in 54"X96" sheets for around $100.00 to $350.00 a sheet depending on brand and thickness. They use this material to make parts on boats, various doors, covers, cabinets, decks, etc. It's UV resistant, comes color molded in, thus no painting is required. The key thing is weight. Each panel weighs 48 lbs, and under my current drawings and plans, I would need 9 sheets. The other dilemma is that they have to be put in with mechanical fasteners, as I haven't the capacity to purchase their welding system or fancy adhesive to put this together. The key thing I am looking at is that I am going to build this camper and use it for the next 40+ years, probably every weekend for 8 months out of the year and 4 weeks solid for vacation from work, and by the time I get ready to get rid of it, I'll be in my late 70's early 80's. Biggest thing is that if I build this it has to last, and easily repairable, thus the mechanical fasteners.

So what's your thoughts on using Starboard for the outside of the camper?

Thanks

Matt
 

ThomD

Explorer
Funny you should bring this up now because I was just thinking about Starboard for a small project. I don't think it is suitable for large scale like that if for no other reason than the weight. A 4x8 3/4 inch sheet weighs about 130 lbs according to their web site.

There are a couple of threads showing some work using it on the interiors of vehicles in AU, but I'm pretty sure they don't use it for the shell.

www.buckwoodcraft.com does a lot of work with the material. They sell small peices and odd sizes, so you could get a few pieces and see how they feel & hold up in person.
 

Sportsman Matt

Adventurer
Thanks for the reply ThomD. I was looking at a 3/4" sheet or 1/4" with hardwood for the floor and 1/4" for the exterior of the walls and underneath the 1 pc rubber roof. The reasoning I have in using it is that if I build the exterior out of this, the only points whare water would be an issue are the seams which I would use caulking on, and have the walls and ceiling sandwiched ie. the outside is 1/4" Starboard, Aluminum frame and hard Foam Panels, and Paneling on the interior screwed in instead of staples. The reason is that if a panel was water damaged on the interior, I can pull the panel, inspect the insulation, and reinstall a new panel after finding and sealing the leak. Water wouldn't really be an issue to the frame or exterior because the frame and exterior would be made of Starboard and Aluminum. I've got a couple pieces from the local marine supply, they just don't carry the 1/4" in stock, just 1/2" and 3/4". Looks like it might work, just getting opinions on it and seeing if anyone else has been using it with or without problems.

Thanks

Matt
 

ThomD

Explorer
whatcharterboat said:
Hi Thom . How ya been? I thought I'd throw the link up for Matt to have a look at.

Hi John,

I'm working too much. I seem to have landed in exactly the job I always wanted to avoid - dull and safe, with a long commute but it pays very well. One coworker called it the golden handcuffs.

I'm still kicking around all sorts of crazy ideas for rigs and builds. I love the whole process of investigation and research and planning, so I can sort of accept that it'll be a year or two before we do anything interesting.

Back the the OP, a nida core outer skin like the Super Camper is pretty close to your requirements - straight forward DIY, no rot, repairable.
 

Martyn

Supporting Sponsor, Overland Certified OC0018
Matt

If you download the "Working with King StarBoard" pdf it recommends structural support every 16"-18" and then a 1/32" gap for every foot of length for expansion.

It's the expansion issue that worries me for your application, with an 8 ft long bed you should expect expansion of 1/4". How would you accommodate for that?
 
Last edited:

Gear

Explorer, Overland Certified OC0020
Martyn
It's the expansion issue that worries me for your application, with an 8 ft long bed you should expect expansion of 1/4". How would you accommodate for that?

I believe this will be your problem with King Starlite. I have been trying to use it as a platform material on my Jeep. Look at the photographs.

P1020882.jpg

This is black 1/2" Starlite XL. The span in the middle is 3 feet. I installed the Starlite when it was cool out. When the sun heats it up it bows upward almost 2 inches.
P1020884.jpg


P1020881.jpg


Oh and if anyone has any ideas on how to remedy this problem please let me know. As of right now I think I am going to go back to using aluminum.
 

Martyn

Supporting Sponsor, Overland Certified OC0018
Justin

If you attach the material to the rack below using slots rather than holes the material will be able to expand. Route out a slot for the shaft of the bolt, and then an elongated recess for the head of the bolt. Use washers on either side (maybe a rubber washer beneath) and tighten it down to the point where it is snug but can move with the expansion.
 

Martyn

Supporting Sponsor, Overland Certified OC0018
Capt Eddie said:
How about Sheathing it with 3/8 Laun paneling then cover the entire exterior with fiberglass matte??

I would imagine that would defeat Justin's aim of keeping it lightweight.
 

Gear

Explorer, Overland Certified OC0020
Thanks Martyn for the reply. I have given the idea of slotting the holes several go arounds. My concerns are 1 not having a smooth top surface, 2 there are a lot of bolts (20) or so holding that panel on, and 3 the close proximate to the material edge (bolts).

Sorry for the hijack!
 

Sportsman Matt

Adventurer
Not a problem, Actually seeing photos helps. Just curoius did you go with the Starlite or Starboard? There is a difference in the composition of the material, Starlite looks good but it appears that it has less density than the Starboard. The original plans call for painted hardboard, something I would consider if it weren't for the fact that I've seen hardboard delaminate and become mush if it gets wet. That's why I was looking at the starboard material, it's waterproof, can't rot or fall apart, and if it weren't for the expansion issue, the price would be considered an investment worth while if it lasted for twice more than the average 10-20 years of a typical camper.

After seeing the photo, I'm wondering if there is anything out there that can be used like Starboard but without the shrinkage or expansion issues other than fiberglass or filon, as I don't have a way to glue the filon to the framework, and fiberglassing over plywood isn't something I would be able to do in the backyard without getting dirt and dust in the finish.

Wonder what else would work, and I'm avoiding aluminum, too noisy when it rains.
 

Gear

Explorer, Overland Certified OC0020
Sportsman Matt
Just curoius did you go with the Starlite or Starboard?

I am certain it was the King Starlite XL in 1/2". I went with the Starlite XL because it is lighter in weight.
 

Sportsman Matt

Adventurer
OK, I was wondering. The key thing is the expansion and comression of the panels that concerns me. I've been searching out something to use, looks like I'll be using PT Plywoods and PT Lumber for the exterior framework with a sheathing of fiberglass roof and wall liner for the exterior and found some exterior rated PVC trimboard, for the edges, transitions, and corners.

Thanks for the input so far. I'll be starting a new thread in the spring when I get going on this project.

Matt
 

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