Regional Engineering & Meteorological Analysis
The Science of Roofing Vulnerabilities Across the Wasatch Front
Nestled tightly between the Great Salt Lake and the steep western scarp of the Wasatch Mountain Range, Salt Lake City experiences dramatic microclimates characterized by high annual snowfall, lake-effect snow squalls, rapid freeze-thaw cycles, and violent downslope Canyon Winds funneling out of Parleys, Big Cottonwood, and Little Cottonwood canyons. To protect your property, it is crucial to understand the mechanical forces acting upon your roof assembly:
The Thermodynamic Dynamics of Ice Dam Formation in Utah
Ice dam formation along the Wasatch Front is a thermodynamic failure requiring three simultaneous environmental factors: significant rooftop snow accumulation, heat escaping from the living space into the unconditioned attic, and outdoor ambient temperatures remaining below 32°F.
Warm air leaking through attic bypasses—such as unsealed recessed light fixtures, furnace flue chases, and attic access hatches—warms the underside of the roof decking above freezing. The snow layer directly touching the shingles melts into liquid water and trickles down the roof slope toward the eaves. Once this runoff reaches the cold overhang, which lacks heated living space beneath it, the water refreezes into a continuous ice dam.
As melting continues upstream, trapped water creates a reservoir behind the ice ridge. Standard asphalt shingles, wood shakes, and concrete tiles are shed-type coverings designed to shed water downward with gravity; they are not hydrostatically sealed barriers. The backed-up meltwater exploits capillary tension to travel horizontally and upward between overlapping shingle courses, penetrating underlayment seams and pouring into attic framing and drywall ceilings.