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If water is coming out of soffit vents or coming into your house or building, ice dams are likely the main culprits.

In a residential building, substantial insulation in your attic can help prevent ice dams from forming. In both residential and commercial buildings, a rubber membrane installed under the shingles can help prevent ice dams. Do not place rock salt or ice melt products on your commercial or home roof during winter. These products can damage roofing materials.

Water is powerful and stubborn. If anything blocks its proper flow, it will find another route. Often in winter, water can back up underneath roof shingles. If that water breaks through the protective barrier below your home’s roof shingles, it will leak into your home; if water finds its ways to a bad seam or weak spots in flashing, it will leak into your commercial building.