This practical guide to roofing systems in Vancouver explains how roofing materials, underlayment, ventilation, flashing and drainage work together to protect a home from rain, snow and ice. It also explains how ice dams form and why insulation, air sealing and balanced roof ventilation are important parts of ice dam prevention.
What You'll Learn in This Roofing Systems & Ice Dam Prevention Guide
- Roofing material selection
- Roof slope and material requirements
- Underlayment systems
- Ice-and-water protection
- How ice dams form
- Attic insulation and air sealing
- Roof ventilation
- Valleys, penetrations and flashing
About This Roofing Systems & Ice Dam Prevention Guide
A roof is a complete system rather than simply a layer of shingles or other exterior material. Underlayment, flashing, valleys, penetrations, ventilation and the roof structure all contribute to water management and long-term performance. Ice dams are fundamentally connected to heat loss and roof-assembly conditions, not simply the roofing material itself
Many serious roofing problems can be identified while the assembly is still exposed. Careful material selection, correct flashing, effective ventilation and inspection before the roof is covered are important steps toward long-term roof performance.