Several things that you can check in order to verify the authenticity of your ROOFTOP® products are: check the laser-printed ROOFTOP® logo and production code located on the sides of the roofing sheets, check the precision of interlock system, check whether there are no gap left when ROOFTOP® sheets are stacked, and lastly, check whether it has the ability to withstand ample amount of weight without forming any cracks. For further information, please visit this page.