26 Oct '12, 6pm

Ice & water UNDER or OVER the drip edge? #green

"Grace, the manufacturer of Ice & Water Shield, advises that its peel-and-stick membrane should be installed before the drip edge. There are several reasons for this. If ice ever backs up from a clogged gutter, the ice can get under the drip edge and reach the plywood. If the Ice & Water Shield goes down first, the plywood is better protected. Also, if the galvanized drip edge ever rusts, it is easier to replace when reroofing if it is installed on top of the Ice & Water Shield. When it comes to synthetic roofing underlayments in warm climates, the same rule applies, but for different reasons. Water can wick uphill on top of the drip edge, so it's better to have the drip edge on top of the underlayment."

Full article: http://www.greenbuildingadvisor.com/community/forum/energ...

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