Guest User
9/21/2009
Should the underlayment run vertical (parrallel to the sheet) or horizontal (90d to the sheet) when placed on top of sheathing in a new roof?? and how much should I over lap it??
Todd Miller
Isaiah Industries, Inc.
9/24/2009
Horizontal. Lap per manufacturer instructions of either the underlayment or the roofing to be installed. Often 6".
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