What is Ice and Water Shield?

Ice and water shield, also known as ice barrier membrane, is a crucial component in roofing systems, especially in regions prone to harsh winter conditions. It is a self-adhesive waterproof underlayment that provides an additional layer of protection against water infiltration caused by ice dams, wind-driven rain, and other severe weather conditions. This material is typically installed along the eaves, valleys, and other vulnerable areas of the roof to prevent water from seeping into the structure and causing damage.

How to Use the Ice and Water Shield Calculator

Step 1: Determine Your Roof Pitch

Measure the roof pitch by placing a level against the roof rafters and measuring the vertical rise over a 12-inch horizontal run. Enter this value in the “Roof Pitch” field of the calculator.

Step 2: Measure the Eave Overhang

Measure the distance from the exterior wall to the edge of the roof. This is your eave overhang. Enter this measurement in inches in the “Eave Overhang” field.

Step 3: Measure the Exterior Wall Thickness

Measure the thickness of your exterior wall from the inside to the outside surface. Enter this value in inches in the “Exterior Wall Thickness” field.

Step 4: Calculate the Total Eave Length

Measure the total length of all eaves where you plan to install ice and water shield. Enter this measurement in feet in the “Total Eave Length” field.

Step 5: Measure the Valley Length

If your roof has valleys, measure their total length. Enter this value in feet in the “Total Valley Length” field. If you don’t have valleys, enter 0.

Step 6: Click Calculate

After entering all the required measurements, click the “Calculate” button. The calculator will process your inputs and provide the results.

Step 7: Interpret the Results

The calculator will display the required coverage from the roof edge in inches, the estimated total area of ice and water shield needed in square feet, and the recommended number of rolls to purchase. Review these results to plan your roofing project effectively.

Step 8: Consider Additional Factors

Remember that the calculator provides an estimate. Consider factors such as waste, overlaps, and any additional areas you might want to protect. It’s often wise to purchase slightly more material than the exact calculated amount to account for these factors.

By following these steps, you can accurately estimate the amount of ice and water shield needed for your roofing project, ensuring proper protection against water damage and ice dams.