“Ice and water” refers to a type of roofing underlayment designed to provide additional protection against water infiltration in areas prone to ice and snow accumulation. The purpose of ice and water underlayment is to create a watertight barrier between the roofing material and the underlying roof deck or sheathing.
In areas where temperatures drop below freezing, ice dams can form along the eaves of a roof. Ice dams occur when snow melts on the upper portion of a roof, and then refreezes along the lower edge, forming a barrier that prevents water from draining off the roof. As water continues to melt and accumulate behind the ice dam, it can infiltrate under the roofing material and into the underlying roof deck or sheathing, causing damage to the roof structure and potentially leading to leaks and water damage inside the building.
Ice and water underlayment helps prevent this type of damage by providing a waterproof barrier that seals around nails and other roof penetrations. The underlayment is typically installed in a continuous layer along the eaves of the roof, extending up the roof deck for a distance specified by local building codes or manufacturer guidelines. This creates a barrier that prevents water from infiltrating under the roofing material and causing damage to the underlying roof structure.
In addition to providing protection against ice dams, ice and water underlayment can also provide added protection against wind-driven rain and other types of water infiltration. This can be especially important in areas with high wind or heavy rainfall.
In conclusion, the purpose of ice and water underlayment for roof installation is to provide an additional layer of protection against water infiltration, especially in areas prone to ice and snow accumulation. By creating a watertight barrier around roof penetrations and along the eaves of the roof, ice and water underlayment helps prevent damage to the roof structure and potential leaks inside the building.
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