Why all manufacturers do not use composite?

Gdetrailer wrote:

westend wrote:
Azdel may have 50% more R-value than Luan but you are increasing the value from R-0.25 to R-0.37 (actual values are lower). The only value with these synthetic materials is for the consumer--they are waterproof and weigh somewhat less, for the mfg--they are consistent and easy to tool/bond, they are a marketing ++.

I would suggest to the OP that maintenance regarding sealing from water is the best "science". If you develop leaks with composite materials the glue will fail and damage will be greater than a wood frame, i.e. delamination and rapid structural failure.

X2!

Another potential "pitfall" of materials like "Azdel" is the fact that if it is "water proof" it can HOLD water in between the walls..

Essentially TRAPPING moisture which will eventually MOLD AND MILDEW..

Then you are no better off than using good old time proven stick and tin..

So if you are looking at the idea of Azdel as curing all water leak problems you are only kidding yourself..

NEVER said AZDEL was water proof. It is not. I said it will not rot, and it won't. And the only proven thing about Luan. Is that it is heavy, and it will rot. Nothing wrong with Luan. It is just a dated technology.
Folks, Progress is every where. And some of it is good. Remember that time when ALL RVs were made of aluminum siding? Things change. You can come along, or sit and watch. Wouldn't you really like for your RV to be 1000 pounds lighter, and stronger at the same time?

However. Have y'all noticed that the Aluminum sided RVs are making a come back? On nearly every dealer lot. Fiberglass sided RV are harder to find, and the Aluminum sided ones are every where. From Coachmen, to Shasta. Grey Wolf, and Jayco.