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theoldwizard1's avatar
theoldwizard1
Explorer II
May 07, 2018

RV Construction

Anyone who has followed my post know that I am quite opinionated especially on RV construction and the short cuts/cost cuts various manufactures take.

Over in a different part of this forum, I ran across this image of a Coachmen Freedom Express exposed rear wall.



The wall is being repaired due to delamination, but waht should be noted is that this rear wall is NOT aluminum framed with rigid foam insulation (like the sidewalls) and did not have Azdel substrate (like the sidewalls). Okay, I admit, the website states that Azdel is only used in the sidewall, but really how much did they save using wood and fiberglass insulation ? $20 ? $50 ?

Make you wonder what is under that nice smooth one piece molded front cap !

In one of Coachmen's video they talk about their laminated floor construction. Here is a snapshot



To my eye. it looks like there are 3 different layers of wood in that floor. So much for rot resistance if there is a leak !

Again, how much would it cost to use rot-proof material ? $100 ? $200 ? Even it the upgrade was $500, I would pay for it !

49 Replies

  • As long as you keep it dry...


    But that's the rub. Water is the RV killer. If you made them impervious to it by using materials that do not degrade when wet the darn things could last 30 years without batting an eye.

    Steve
  • donn0128 wrote:
    Actually luan is a light weight plywood. NOT particle board.

    Yep, all the luan I've used is thin plywood.
  • j-d's avatar
    j-d
    Explorer II
    donn0128 wrote:
    Actually luan is a light weight plywood. NOT particle board.


    Agree. A clever friend used to buy one sheet and make a little boat out of it means it's flexible for things like a cheap RV roof with an arch
  • theoldwizard1 wrote:
    Anyone who has followed my post know that I am quite opinionated especially on RV construction and the short cuts/cost cuts various manufactures take.

    Over in a different part of this forum, I ran across this image of a Coachmen Freedom Express exposed rear wall.



    The wall is being repaired due to delamination, but waht should be noted is that this rear wall is NOT aluminum framed with rigid foam insulation (like the sidewalls) and did not have Azdel substrate (like the sidewalls). Okay, I admit, the website states that Azdel is only used in the sidewall, but really how much did they save using wood and fiberglass insulation ? $20 ? $50 ?

    Make you wonder what is under that nice smooth one piece molded front cap !

    In one of Coachmen's video they talk about their laminated floor construction. Here is a snapshot



    To my eye. it looks like there are 3 different layers of wood in that floor. So much for rot resistance if there is a leak !

    Again, how much would it cost to use rot-proof material ? $100 ? $200 ? Even it the upgrade was $500, I would pay for it !



    That's common practice for most TTs and 5ers with laminated sidewalls. One manufacturer who uses aluminum framed front and rear walls made the same as the sidewalls is Rockwood/Flagstaff on units without fiberglass caps.

    .....Energy Brace Substrate = Coroplast. "Aircraft grade aluminum" that's funny stuff.
  • As long as you keep it dry, wood has far better strength to weight ratio and fatigue loading characteristics. As long as you keep it dry it will last for decades.

    All materials have trade offs. Helped a buddy build a plastic deck one time. Drastically heavier and more time consuming to install...plus the rails were sagging before it was complete. It was a nice deck but not for 3 times the cost and 4 times the effort to build.

    For a weight sensitive item like an RV, that strength to weight ratio really makes a difference. Sure you could build a carbon fiber composite that's even better but it will be a lot more than a couple hundred extra.
  • SidecarFlip wrote:
    Luan is the industry name for cheap particle board....Aircraft grade... Laughable. Nothing aviation grade in any Rv that I know of.


    did you ever work in the building trades, ever built a house
    Luan is NOT particle board
  • Actually luan is a light weight plywood. NOT particle board.
  • I don't understand why the houses are not just made completely from plastic. Large blow-molded or vacuum-formed shell components.
  • Luan is the industry name for cheap particle board....Aircraft grade... Laughable. Nothing aviation grade in any Rv that I know of.

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