Minnesota Cold
Dan Miller Progressive Farmer Senior Editor
Mon Dec 22, 2014 10:41 AM CST

Steve Carlson built his new shop for Minnesota winters. It was a cold winter this past year, even by Minnesota standards. Temperatures dropped outside to minus-20 degrees Fahrenheit, yet Carlson worked on equipment in 58-degree comfort.

Key to this shop's wintertime warmth is the energy-efficient envelope afforded his 4,900-square-foot building by a Structural Insulated Panel (SIP) wall system. Each interlocking panel (no standard lumber is used) is made of two 3/4-inch sheets of plywood that sandwich 8 inches of rigid foam plastic insulation. The panels are 4 feet wide and give the 18-foot walls a high R-value of 33. The ...

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