Assembly detail · Harrison, New York
Ice Dam Risk And Roof Planning
Treat ice dams as a multi-part assembly problem.
Use five lines on the Ice Dam Risk And Roof Planning decision sheet: winter leak and melt pattern; ceiling-plane air leakage; insulation at the eaves; ventilation design and baffles; roof-edge membrane and flashing details. Mark an unresolved Ice Dam Risk And Roof Planning line as an exclusion, allowance, or unanswered question instead of hiding it. Do not climb onto an icy roof or work below falling snow and ice. A safe inspection and building-assembly plan belong with qualified people.
Planning factors
Five decisions worth documenting
Use the headings as a proposal check. The actions beneath them are specific to this project decision.
Winter leak and melt pattern
Record when ice, interior leakage, and snowmelt appear, using safe ground-level views. Do not climb onto snow or stand beneath falling ice to improve the record.
Ceiling-plane air leakage
Heat leaking through the ceiling can warm the roof deck. Ask a qualified evaluator about air paths rather than assuming the covering alone caused the melt pattern.
Insulation at the eaves
Insulation at the eaves can be thin, displaced, or constrained by geometry. The proposed correction should preserve the complete air and thermal strategy.
Ventilation design and baffles
Ventilation and baffles matter within the chosen assembly. An added ridge vent is not automatically a complete ice-dam remedy.
Roof-edge membrane and flashing details
Roof-edge membrane and flashing details can help manage water, but they do not remove the heat source. Compare the roofing scope with the building-science recommendations.
Prepare the property
Keep these details on one sheet
- Winter leak and melt pattern
- Ceiling-plane air leakage
- Insulation at the eaves
- Ventilation design and baffles
- Roof-edge membrane and flashing details
Before authorizing work
What record belongs with “winter leak and melt pattern” before work begins?
Request a dated description and the evidence supporting the proposed treatment. Cross-check entries: ceiling-plane air leakage; insulation at the eaves. Named responsibility: ventilation design and baffles. Closeout file: roof-edge membrane and flashing details. Identity check for Ice Dam Risk And Roof Planning: confirm the business, applicable County license, roofing insurance, and current Harrison permit steps separately.