SUMNER System Introduction

System Compliance


SUMNER® Adhered Masonry Veneer (SAMV) is certified compliant with the New Zealand Building Code by BEAL Ltd, Plimerton, Wellington.


BEAL Ltd is an independent company actively involved in the building sector. They conduct testing and generate appraisals, compliance certificates, and other activities relating to the construction industry. (Please ignore any reference to BEAL CODEMARK, as it was discontinued a few years ago and is no longer a compliance pathway).


BEAL Appraisal Certificate: Appraisal Certificate


We recommend downloading our complete set of compliance documents from our documents page which includes Written Specifications and Architectural Details.




System Description


SUMNER® system products are used to install a wide range of adhered masonry, and ensures both adhesion and weather tightness. Let us consider both aspects:  


1. Adhesion using SUMNER® Grip PlusMasonry adhered to blockwork

SUMNER® Grip Plus is an adhesive that can bond 25-60mm, flat-backed masonry slips to various substrates. It offers an impressive tested break-free pull strength exceeding three tonnes, surpassing other industry adhesives. The adhesion can be directly made to blockwork, brick, tilt slab, and solid pour masonry. However, for cladding projects, it is essential to have a cavity to ensure weather tightness. (see below).


Our adhesive system includes a unique stainless steel fixing that is installed during the installation process. These fixings are designed to support the masonry's weight fully, thereby eliminating any stress on the adhesive for the entire duration of the installation's lifetime. 


2. Weathertightness

SUMNER® is a modern cladding that is designed to be weather-tight. To achieve this, a constructed cavity is used. Our pre-cladding consists of fluted plastic battens and fibre-cement sheet backing board installed by a Licensed Building Practitioner (LBP) qualified for restricted building work. This ensures compliance with the NZ Building Code. It's important to note that waterproofing and other coatings applied by someone other than an LBP are not recommended as they are poor substitutes for a constructed cavity. 


For detailed technical information, please consult the SUMNER Technical and Installation Manual on our documents page. 


System Advantages

How is SUMNER different to other systems?

  1. SUMNER Grip Plus is the only adhesive that has not failed, while all other adhesives have and continue to do so. It's the most important adhesive for adhered masonry. 
  2. No 3rd Party systems or warranties.
  3. SUMNER Board is denser than other fiber-cement boards, having a density of 1420 kg/m3. The stone, adhesive and board are similar in their makeup and consequently have a similar lineal coeficcient of expansion and contraction. An advantage of using a system designed specifically for stone veneer.
  4. Superior Battens - SUMNER's hollow core, ABS recycled plastic batten is preferred to timber battens which can develop mould inside the wallspace. More importantly in the presence of moisture timber will expand and contract behind the inert stonework. Our battens isolate this detrimental process as plastic does not swell with moisture.
  5. SUMNER fixings unique to our system.


Avoid failures

We cannot stress enough the importance of avoiding tile adhesives.


When writing this, SUMNER® was specified to replace a large basalt job where vast amounts of stone had fallen off. The architect contacted us to reinstall this project correctly. The client had previously adhered stone to tilt slab structure using a waterproof membrane and a popular imported tile adhesive. There are many instances of this type of failure.

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