I have a 1930’s home in Oakdale with an expandable 2nd floor attic. I have had terrible ice dams for many years and finally got tired of paying to have ice removed. I called DamBreakers to trouble shoot why. They came to my home and found that on both sides of my dormer there was a small attic with no roof vents at all and no soffit vents and no insulation. No on ever told me why or how ice dams formed on my roof. I am now educated. I have new soffit vents and roof vents. I feel ready to take on winter. Thank you Bruce.