Beyond the Surface: The Science of Comfort

10.15am - 11.15am | Chris Ross | Allco

Achieving Durable Below-Ground Waterproofing: A Focus on Integral Solutions and Design Best Practice

In this CPD we will explore best-practice approaches to below-ground waterproofing, with a focus on the principles of integral waterproofing and the role of concrete as part of the waterproofing system. As British Standards (BS 8102:2022) continue to influence New Zealand’s waterproofing expectations, understanding the differences between Type A, B, and C systems is increasingly important.

We explore what integral waterproofing means in practice, why it matters for long-term durability, and how to incorporate it effectively at the design and construction stages. We will also cover how membrane systems (Type A) and concrete admixtures (Type B) can be combined to meet the performance needs of today’s complex builds. As a supplier offering both Type A and B solutions, Allco is uniquely positioned to support a complete below-ground strategy.

Key Learning Outcomes:

• Define integral waterproofing and explain its role in below-ground design.
• Differentiate between Type A and B systems and understand their respective applications.
• Recognise the critical design and site considerations when specifying concrete admixtures for waterproofing.
• Understand the benefits of combining multiple systems to improve waterproofing redundancy and performance.

11.15am - 12.15pm | Alex Holly | Omega Windows and Doors

In this CPD Talk, we will explore design choices around windows and doors that can reduce the impact of the weather on joinery and supporting flashings. Specifying various configurations in order to achieve different ventilation, thermal performance and aesthetic goals.

Key Learning Outcomes:

• How to maximize natural lighting in medium density units.
• Low cost ventilation strategies to maximize airflow for cost effective medium density housing.
• How to specify glazing units in order to minimize solar heat gain in summer. Window placement and building orientation as an effective strategy for solar control.

12.15pm - 1.15pm | Clare Healey | Tile Warehouse

Waterproofing failures are among the most expensive defects in buildings, making robust, compliant design essential—especially in bathrooms, kitchens, laundries and other wet areas. Updates to E3/AS1 now limit immediately consentable flooring options to tiles or stone over a compliant waterproof membrane, or sheet vinyl, reflecting the growing need for watertightness, durability and protection from extreme weather events. A certified system, correct substrate preparation and documented warranties are critical to meeting NZ Building Code requirements and avoiding costly remediation.

Tiles offer the safest pathway to compliance and long-term performance, with true porcelain providing superior density, water resistance and durability compared with lower-grade ceramic products. Quality control in tile selection directly impacts risk, longevity and aesthetic outcomes, while tile and stone surfaces also deliver strong thermal-mass benefits and compatibility with underfloor heating systems. Together, these factors make tiles a resilient, technically sound and future-proof specification choice for architects.

Key Learning Outcomes:

By the end of this talk, architects will be able to:

• Understand the NZ Building Code waterproofing requirements and recent E3/AS1 changes affecting wet-area flooring.
• Identify why tiles and stone over a compliant membrane provide the most reliable, consentable waterproofing solution.
• Distinguish between porcelain and ceramic tiles, including the impact of water absorption, density and manufacturing quality.
• Recognise the risks and long-term consequences of using non-compliant systems, poor substrates or low-quality materials.
• Explain the thermal-mass and underfloor-heating advantages of tile and stone surfaces in contemporary building design.