Where Should Ice and Water Membrane Underlayment Go?
Roof Ice & Water Membrane The purpose of ice and water underlayment is to stop water from passing through the roof system into a home. Ice and water membrane is needed most to address ice damming issues during the winter. Roof Ice Damming Ice can build up on a roof slope, usually at the unheated area at the eaves, forming an ice dam that prevents water from draining off the roof. In turn, this water can creep up under…