Weatherboard cladding has long been popular on our shores, but traditionally it was used horizontally, and primarily on residential homes. Over the years, design and building methodologies have developed and vertical shiplap cladding has seen a surge in popularity.

The huge uptake of vertical shiplap cladding presented various issues for designers in that the Building Code still didn’t, and doesn’t, allow for it to be used over a drained cavity. This issue saw the cladding industry work around the problem, and Timspec were the first company to achieve a CodeMark certification for its vertical shiplap cladding system.

“That certification means that our system can be used over a drained cavity and it has been tested and proven as a proprietary system that overrides the stipulations of the Building Code,” Timspec’s Jonathan Rugg says.

That first CodeMark certification led to Timspec gaining CodeMarks for each of its four CertClad systems, which each incorporate the use of three different timber species – pine, radiata and accoya.

“Interestingly, what we’re seeing at the moment in terms of timber cladding is its popularity and use increasing dramatically, due mostly to a move into the commercial market, as well as its sustained popularity for residential projects,” Jonathan says.

“That’s where the growth is at the moment – into commercial buildings up to about four storeys high. In these types of buildings timber really stands out compared to the more traditional materials used for commercial builds like steel and glass.”

But within this sustained growth, the knowledge of how to properly install weatherboard cladding remains a vital part of ensuring every project is built correctly.


“It’s for this reason that we decided to update each of our 12 installation specification manuals and re-release them to the market in January,” Jonathan says.

“What we’ve found over the last few years is that people get a lot of questions about installation despite there being a wealth of information out there. The problem with all this information is that the time it took to read it was unreasonable due to its complexity.”

As a result, TImspec decided to approach things in a different way, and they’ve completely rewritten each of their 12 manuals in a much more refined and user friendly manner, allowing builders to quickly and easily find and read the information they need. “While we strive to ensure that our products and systems of the highest quality, at the same time we aim to ensure that they are installed correctly,” Jonathan says.

In the case weatherboard systems are installed incorrectly – and the margin of error is minute – the risks and wide-ranging including weather tightness issues and cupping.

“Incorrect nail positioning is the most common error in installation, and there are only a few millimetres of tolerance to ensure the boards are nailed correctly.”

Timspec’s new concise installation manuals are all available on their website and are free to download. “We also offer on-site assistance and training, and extensive online advice.”

If you’re considering weatherboard cladding for your next project, residential or commercial, make sure you visit Timspec on ArchiPro here to see what you could achieve.