The correct underlayment is 30 lb asphalt based tar paper as required at minimum by code to be laid on top of the roof sheathing and overlap a minimum of 2 inches at the seams. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. Roofing underlayment or felt provides an extra weather barrier in case of blowoffs or water penetration through the roofing or flashings.
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