MN Landscape Practice Questions - Minnesota Landscape Contractor License Exam

What is the minimum required depth for burying landscape irrigation pipe in Minnesota to avoid freeze damage?

6 inches 12 inches 18 inches below the frost line Irrigation pipes are buried 10-12 inches but must be winterized since they cannot reach below the 42-inch frost line

Correct Answer:

Irrigation pipes are buried 10-12 inches but must be winterized since they cannot reach below the 42-inch frost line

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