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Message: [QUOTE="sutomcat, post: 3467911, member: 27"] It takes a lot of patience to find that short few seconds when this grey/blue surface is extended. I have gone through the video from Lawrinson a bunch of times. When they add on to it, I see is a couple of workers lifting a long, thin panel (it takes a couple). I don’t think they are that heavy but the panels are definitely not super rigid. When the light is right, you can see the metal frame of hard shell through this layer. It is clearly not made of metal. Once this layer is installed, the workers can and definitely do walk on it. It is rigid enough to support their weight. So I think based on the excellent link [USER=469]CuseLegacy[/USER] supplied, this is what we are seeing here: [I]Non-Bitumen Synthetic Different types of synthetic underlayment have been around since the early 2000s and they have become arguably the most commonly used metal roof underlayment today. Most synthetics are woven or spun from either polyethylene or polypropylene. While the ingredients are similar, the manufacturing process and thickness of each underlayment type can be fine-tuned to produce different properties, such as exposure time and walkability. “Synthetics are lighter, easier to apply and often provide greater levels of skid resistance,” Ray says. “Many of the roofers I have spoken with will choose an underlayment chiefly due to its ability to reduce slippage. They are resistant to fungal growth, don’t absorb moisture, are highly resistant to UV penetration and can stay exposed for greater periods of time, sometimes up to six months. In most instances, the synthetic material is the go-to for most slopes and, depending on the application, can be used in conjunction with the rubberized asphalt product.”[/I] Note that paragraph that talks about walkability. I agree with CL. This is roof underlayment, which before today, I didn’t even know was a thing. We should probably all relax and wait for the metal composite panels to arrive. Then we can panic. Good to see them do 2 more today. Not good that there is at least one more layer. I will also add that if [USER=5058]NJCuse97[/USER] is right and the exterior surface is metal composite panels, the panels have insulation built into them. I believe they are meant to be one stop shopping when putting up a roof. They have the hard exterior surface, they have insulation and something else I don’t remember. The centria web site is unfortunately down now so I can’t link to it, but there is a good explanation of what metal composite panels are there that is worth looking at. [/QUOTE]

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