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A new piece of building code in the state of Minnesota will require fire sprinklers to be put into new townhomes, single-family and duplex homes that are larger than 4,500 square feet.
This depends on how tall your sprinklers are. For most 4 inch pop-ups you will need to dig trenches about 9 inches deep at the sprinklers. To know for sure how deep to dig, assemble a sprinkler on a fitting and measure the height from the bottom of the fitting to the top of the sprinkler.