Why low slopes are vulnerable
On a steep roof, meltwater runs off quickly. On a shallow roof it creeps toward the eaves, where it refreezes. The ice ridge grows, and the water behind it has nowhere to go but sideways — under shingles, through seams and into the house.
Root causes
- Heat escaping from the house into the roof deck
- Poor attic or roof ventilation
- Too little insulation
- Gutters and edges that hold ice
Fixes
- Seal the eaves — reinforced coating on low-slope edges, or ice and water shield under new roofing
- Add insulation to keep heat in the house
- Improve ventilation so the roof deck stays cold
- Air-seal attic bypasses like light fixtures and plumbing chases
- Consider a different roof system if shingles on a low pitch keep leaking
Short-term help
Roof rakes can remove snow from the edge from the ground. Heat cables can help in trouble spots. Neither fixes the cause.
Recurring winter leaks? Call (505) 257-2289.
Common questions
Can coating stop ice dam leaks?
On low-slope roofs, a sealed, seamless eave can stop water from getting in even when ice forms.
Is it the gutters' fault?
Gutters hold ice, but heat loss is usually the root cause.