Allco_Podcast_-_Greg_Phillips_-_waterproofing

Introduction

  • Podcast hosted by Harley Neville from Chulo, a CPD learning platform.

  • Guest: Greg Phillips, Roofing Category Manager for Allco.

Warm Roof System

Definition

  • A warm roof applies insulation on top of the standard substrate with a waterproofing membrane above it.

  • This shifts the dew point to the top of the roof, enhancing insulation effectiveness.

Advantages for Low Slope Roofing Projects

  • Aligns with new H1 requirements without needing a deeper cavity, thus keeping costs lower.

  • Maintains existing timber structure.

  • Reduces the need for ventilation.

Design and Structural Advantages

Key Benefits

  • Shifting dew point to the outside of the membrane minimizes required roof cavity vents.

  • Avoids increased roof cavity size for insulation.

Design Options

  • Good Design: Internal gutters with scupper outlets.

  • Better Design: Roofs sloped to valleys avoiding internal gutters.

  • Best Design: External gutter systems, allowing unimpeded water flow without blockages.

Benefits for Occupants and the Environment

  • Creates a warm and dry interior, minimizing moisture buildup and mold risk.

  • Enhances thermal efficiency, reducing energy consumption for heating.

Compliance with H1 Requirements

  • Allco now uses a 140mm thick PIR insulation panel to meet new regulations, improving insulation value.

Inclusion of Cover Board in All Therm System

Reasons for Inclusion

  • Protects against damage from construction traffic.

  • Improves aesthetic finish by creating a smoother surface for membranes.

Fully Adhered System vs. Mechanically Fixed

  • Fully adhered system reduces thermal breaks associated with mechanical fixing, enhancing insulation integrity.

Allotherm Warm Roof on Metal Tray Substrate

  • Uses 0.55 gauge trapezoidal metal tray that increases surface adhesion for the vapor barrier and expedites construction.

Recent Work and Innovations

UOA Health and Wellness Roof

  • A hybrid system using tapered EPS to create necessary falls on a concrete substrate with added PIR insulation.

Mairangi Bay Apartments

  • Metal tray substrate warm roof minimizing weight and construction costs, enhancing waterproofing.

Future Directions for Allco

  • Investigating hybrid warm roof systems combining green roofs for urban environments.

Membrane Options

  • Two available membranes: 2-layer torch-on and TPO (Thermoplastic Polyolefin).

Technical Assistance and Support

  • Allco provides technical support, site inspections, and quality assurance sign-offs, along with a 20-year product warranty.

Water Potability Certification

  • TPO membrane system certified for water potability, supporting rainwater collection.

Conclusion

  • For more information, listeners are encouraged to visit Allco's website for case studies and to reach out for discussions on warm roofs.