In this episode, we unpack the role of roof underlays - the hidden layer that plays a vital role in protecting your building.

We discuss how underlays manage condensation, act as a secondary moisture barrier, and contribute to the long-term performance of your roof. The conversation also covers the Masons Roof Underlay range, including VHP Value, Strong, Ultra and Maxi, plus White Face Foil, and the key differences between breathable and non-breathable systems.

We also break down CodeMark certification and what it means for meeting New Zealand Building Code requirements.

A practical listen for builders, roofers and designers looking to better understand roof systems and product selection.

About Masons:

Masons began over 20 years ago, founded by Trent Mason, from a family of bricklayers, and has grown into a building-envelope focused company developing practical systems and products for building and construction in New Zealand and Australia.

To learn more about Masons go to https://mpb.co.nz

Roof ventilation plays an important role in protecting buildings from moisture and condensation in roof spaces.

In this episode of The Masons Podcast, Michelle is joined by Masons Technical Manager Arthur Whitfield to explore the role of roof ventilation in modern construction and to discuss the Masons Passive Roof Ventilation System.

As buildings become more airtight, moisture can accumulate in roof cavities and increase the risk of condensation. Arthur explains how passive roof ventilation works and how the Masons Passive Roof Ventilation System uses natural airflow to help remove moisture-laden air from roof spaces.

The conversation also covers common sources of moisture inside homes, how ventilation supports insulation performance, and why more designers are incorporating passive roof ventilation into their building envelope strategies.

Practical, educational and grounded in building science, this episode provides useful insights for builders, architects and designers interested in creating healthier, more durable buildings.

About Masons:

Masons began over 20 years ago, founded by Trent Mason, from a family of bricklayers, and has grown into a building-envelope focused company developing practical systems and products for building and construction in New Zealand and Australia.

Learn more about Masons products: https://mpb.co.nz

Condensation in roof spaces is becoming more common as homes become warmer and more airtight. In this episode, we discuss why it happens and what can be done to manage it.

Arthur Whitfield, Technical Manager at Masons, explains how moisture enters roof spaces, why long-run roofs are more susceptible, and the key steps designers and builders can take to reduce condensation risk.

We also cover ventilation, airtightness, and the difference between cold and warm roof design.

A practical conversation for builders, designers, and anyone interested in better building performance.

About Masons:

Masons began over 20 years ago, founded by Trent Mason, from a family of bricklayers, and has grown into a building-envelope focused company developing practical systems and products for building and construction in New Zealand and Australia.

Learn more about Masons: https://mpb.co.nz

Flashing tape might seem like a small detail but it plays a critical role in protecting buildings from moisture and air leakage.

In Episode 3 of The Masons Podcast, Michelle is joined by Masons Technical Manager Arthur Whitfield to explain how flashing tapes work, where they’re required, and how proper installation supports weather tightness and compliance in New Zealand buildings.

They discuss flashing around windows and joinery, air barrier sealing, compatibility with underlay systems, and the common mistakes that can reduce performance. Arthur also shares important installation advice.

This episode also includes a key product update: Masons 40 Below flashing tapes now require only one layer on the sill to achieve screw sealability.

Whether you're a builder, designer, or specifier, this episode delivers practical knowledge to help you make better decisions on site and at the drawing board.

About Masons:

Masons began over 20 years ago, founded by Trent Mason, from a family of bricklayers, and has grown into a building-envelope focused company developing practical systems and products for building and construction in New Zealand and Australia.

Learn more about Masons: https://mpb.co.nz

In Episode 2 of The Masons Podcast, building designer Michelle sits down with Masons Technical Manager, Arthur Whitfield, to unpack the importance of flexible air barriers in New Zealand construction. Learn what they are, how UNI PLUS & UNI PRO underlays keep your builds dry, compliant, and on schedule, and discover the key installation tips that prevent costly mistakes.

PART 1: Flexible Air Barriers Explained (00:00 – 12:47)

PART 2: Installation, Compliance & On-Site Tips (12:48 – End)

Key Takeaways:

1. Flexible air barriers vs standard wall underlay
2. Productivity benefits for builders
3. Handling high wind zones
4. Installation mistakes to avoid
5. How performance outweighs costs

🎧 Tune in to make smarter decisions on your next project.

About Masons:

Masons began over 20 years ago, founded by Trent Mason, from a family of bricklayers, and has grown into a building-envelope focused company developing practical systems and products for building and construction in New Zealand and Australia.

For more on Masons go to https://mpb.co.nz

In this first episode of The Masons Podcast, host Michelle is joined by Arthur Whitfield, Masons Technical Manager, to dive into wall underlays and their role in secondary moisture management.

They explore:

1. The main types of wall underlays used in New Zealand
2. How underlays work with cavity closures, battens, and flashings
3. Practical tips for builders, designers, and specifiers

Whether you’re on site or designing the next build, this episode provides real-world insights to keep walls dry, buildings safe, and projects running smoothly.

About Masons:

Masons began over 20 years ago, founded by Trent Mason, from a family of bricklayers, and has grown into a building-envelope focused company developing practical systems and products for building and construction in New Zealand and Australia.

Learn more about Masons at https://mpb.co.nz

Subscribe to The Masons Podcast for more episodes on smarter building, ventilation, and wall systems

Your source for insights and innovation in New Zealand building and construction.