It's highly effective in critical roofing. Leakbarrier ms300 ice and water armor helps to protect a building's deck or internal structure against leaks caused by ice and water damming and wind. This product should be applied under slate and asphalt shingles, protecting the roof from water damage and unpredictable weather conditions Mineral granules on the upper surface provide enhanced skid resistant properties.size 3' wide x 65' longthickness 56 mil (nominal)2 square rollsskid resistant surface provides improved footingrelease film
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