What is “synthetic” underlayment?

A synthetic underlayment is a fully man-made category of roof covering underlayments. The primary advantages of a product like the Atlas, Summit Synthetic underlayment are that it can be left exposed to the elements for up to 6 months, it is much stronger to resist wind effects during the exposure time, has great walking traction and holds the fasteners very well to prevent slipping on the roof deck.

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