Piffin:
Thanks for the input on the topic but allow me to clarify some of your misconceptions.
You said:
"There is a fine error here. OSB has not been on the market for thirty years....OSB has only been with us for a little over twenty years - perhaps as much as 25, but no more. before that, its predecessor was waferboard which is the source of much bad publicity, well deserved."
--Right, but I never said I have used OSB for all of those 30 years and the articles I have posted from the researchers indicate the rpoblems with the earliest forms of OSB and 'aspenites' and 'waferboards' whioch should not be confused with modern OSB.
Piffin also said:
"But I will never allow it on any roof that I build. It is not acceptable for that use. Seams will telegraph and dips will show through an asphalt roof. it has not the same lateral strength needed to support snow loads. Perhaps you live in an area where snow is light."
-Well that is your opinion, but it is not mine. OSB does NOT 'telegraph' through shingles unless it is improperly installed.
And it is just plain FALSE that OSB does not have greater lateral strenght. In fact the opposite is true. OSB has GREATER sheer and load bearing strength which is why you can user thinner sheets of OSB than plywood for equal spans. The scientific and code research backs this up universally: OSB is stronger than plywood, but for all intents are treated as equals for simplicity sake for load bearing and sheer strength. And YES I live in a region of high snow load and have never seen any failures due to the use of OSB alone.
Piffin then said:
"You don't suppose there would be a market for this newest generation of chipboard product if the old OSB was really any good do you? OSB is going the same way that waferboard did - because of its reputation as a second rate product."
-OSB by any other name is till OSB. OSB simply means an engineered sheet wood product made using the technique of using "oriented stands" of wood fibers that are pressed and glues into place...The process name has nothing to do with product or trademark identity....But it is true that OSB, like all engineered wood products even plywood, is an EVOLVING product and process and was also addressed in my links.
The reality is that no matter what you call it or how you package it, as long as the basic process stays the same it is still OSB.
So I disagree completely that OSB is going anywhere. OSB was 'waferboard" and OSB is now 'Advantech' and OSB will be other things in the future as this product remains.
Piffin finally said:
" The OSB has been with us for a generation and deserves the rap it gets. The builders who favor it base their choice not on studies of factual experience, but on price. Experrience shows different. If you can cover it up fast enough to keep it from ever getting damp, it is probably OK in light load conditions. But it will deteriorate when wetted. It will sag in roof situations. You fight a losing battle to defend it against those of us who know better from long experience. "
Again, this is completely FALSE and the research concludes oppositely from what you have stated and I can only base you acceptance of these myths based on not having read any research on the issue...and if you can produce any research to refute what I have stated I'll be glad to consider it. But the reality is:
-OSB is superior to plywood for load conditions as the research openly states
-OSB does not sag when wet anymore than does plywood.
-OSB is BETTER at repelling water than plywood because it takes longer to saturate than plywood. The only issue with OSB is that when it swells from having been wetted, it does not return to its original shape as easily or as readily as plywood.
-OSB does NOT rot as easily as plywood. Their characteristics in this area are the same.
And again, MY experience and the scientific research does not agree with your claims....
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