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While I realize this post began back in 2013, I'm glad that I found it and I must applaud the person who posted the comment dated January 18, 2019. Whoever you are, you're definitely correct in all you had to say not to mention you restore my faith in humanity. I should also add that given comments like that posted by an alleged Texas insurance adjuster, he is either blowing smoke or has unfortunately been misinformed or lied to along the way whereby he needs to take a course in chemistry 101. Last but not least, I would like to leave everyone who patronizes this particular forum some food for thought and, no, you don't have to be a chemist to understand what I am about to state. To begin, I am sure most everyone has experienced or is aware of the damage that can result from rust/oxidation on cars and trucks over time (Yes, I am fully aware that the salt or sodium chloride that municipalities use to melt ice on the road in colder climates doesn't help and serves to accelerate the rust damage). And as one who has conducted commercial property condition assessments and commercial roofing inspections (architectural metal roofs included) over the past 30 years, I have also seen how rust serves to compromise the integrity of structural steel lintels/beams (embedded in masonry walls) with webs and flanges 1/4 inch and thicker worn thin and so severely rusted one could easily insert a pocket knife. If you know your basic chemistry, then you know why this happens. Forget about the salt trucks on the road and the salts present in mortar. Though in certain instances salt serves to accelerate the rust damage, the ingredients or variables required all remain the same whether we're discussing a metal roof, automobile/truck, steel beams and lintels, the chemistry doesn't change. Oh, and lest I forget, the rust taking place in the aforementioned examples are all cosmetic, right? I rest my case!
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