Yup. Thanks for pointing that out. I couldn't find about the s-bend technology. Unfortunately, as I've mentioned in the blog post the lack of standards followed

Yup. Thanks for pointing that out. I couldn't find about the s-bend technology. Unfortunately, as I've mentioned in the blog post the lack of standards followed causes a great trouble adopting these technologies. Mostly used roof sheets in Sri Lanka are similar to what's there in my roof (~~~~ shaped)