Understanding Ice Dams: Causes, Diagnosis, and Solutions

Ice dams can be a major headache for homeowners, leading to roof damage, leaks, and costly
repairs. But what exactly causes ice dams, and how can you prevent them? Research from the
University of Minnesota shows that issues like inadequate air sealing, insulation problems, and
poor attic ventilation are key contributors. Here’s how ice dams form and the steps we take to
diagnose and fix them.

How Ice Dams Form
Ice dams occur when warm air escapes from the living space of your home into the attic,
causing parts of the roof to heat up and melt snow. As the water flows down, it reaches colder
areas near the eaves, where it refreezes and forms a dam. This ice buildup traps more water,
which can leak into your home and cause damage. The root causes often include poor air
sealing, insufficient insulation, and inadequate attic ventilation.

Key Diagnostic Tools: Blower Door Tests and Infrared Cameras
To accurately identify the sources of heat loss and air leaks, we use blower door tests and
infrared camera analysis. A blower door test measures how airtight your home is, helping us
locate gaps and leaks where warm air is escaping. Infrared cameras provide a visual map of
temperature differences, highlighting areas where insulation is lacking or improperly installed.

The Role of Zone Pressure Diagnostics
Zone pressure diagnostics help us understand how air moves between different parts of your
home. By measuring pressure differences, we can detect hidden pathways where warm air is
leaking into the attic, contributing to ice dam formation.

Improving Air Sealing and Ventilation
Proper air sealing and attic ventilation are crucial to preventing ice dams. Sealing gaps and
cracks between the living space and the attic reduces the amount of warm air that escapes.
Additionally, adequate ventilation helps cool the roof deck and vent moisture, preventing the
conditions that lead to ice dams.

Get Help with Ice Dam Prevention from Snap Construction
If you’re dealing with ice dams or want to prevent them from forming, our experts at Snap
Construction can help. We offer comprehensive diagnostics and insulation services to keep your
home protected. Contact us today for a free consultation and estimate, and let’s work together
to safeguard your home this winter.