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Message: [QUOTE="DoubleDee, post: 3468218, member: 3193"] The synthetic underlayment you reference above is what roofers use today in lieu of old roofing felt, under shingles and metal roofing. It is NO WAY what they are using in this job. Felt has virtually all but disappeared from the market. It is a woven product usually, most easily compared to a traditional house wrap, or an old agway feed bag. It is basically in layman’s terms, strong ass felt paper. When they speak of walkability, in roofing terms, they mean slippage on a slope, or lack thereof. As long as I’ve been following along correctly, you are wondering if the “panels” that were put up in the last few days that are spanning the girders allowing them to walk? Then it’s definitely not synthetic underlayment. I sell it everyday to roofers. If it was that, we’d have a few casualties. [ATTACH type="full"]185609[/ATTACH] [/QUOTE]