Integrated Partner

Design with KLH® – CLT

KLH manufactures KLH® - CLT panels for mass timber, integrated into SPEC Toolbox with ETA-06/0138-certified data on every panel. Size, verify and specify a KLH floor or wall build-up into the project you're designing, verified to Eurocode 5 (ETA-06/0138) in Europe, AS 1720.1 in Australia, CCRR-0434 in the US, and a Canadian evaluation report in Canada. Every value comes from KLH's published certifications, not a generic catalogue number.

Explore The Integrations → Powered by SPEC Toolbox. Real ETA-06/0138-certified data on every part.
  • 15 calcs
    CLT tools available
  • 6,000 +
    Engineers using SPEC
  • 12 +
    EU CLT & fastener brands
  • 100 % free
    Browser-based · no download
The only partner currently live in all four regions --- AU, EU, USA and Canada

KLH® – CLT, ready to design.

The only partner currently live in all four regions AU, EU, USA and Canada. Designed to Eurocode 5, AS 1720.1, CCRR-0434 and a Canadian evaluation report.

Europe
CLT

KLH® – CLT

Eurocode 5 (EN 1995-1-1) Calculator →
Canada
CLT

KLH® – CLT

CSA O86 (CSA O86:24) Calculator →
USA
CLT

KLH® – CLT

the NDS (ANSI/AWC NDS) under the IBC / IRC Calculator →
In their words

Why KLH Massivholz builds on SPEC

“We have established a partnership with SPEC Toolbox to foster innovation, which aligns with our core values. We strongly believe in the advantages of making mass timber calculations more accessible by enhancing engineers’ capabilities. We aim to not only facilitate the process but also continually improve the precision and quality of calculation results.”

— Stefan Fritz, Senior Area Manager, KLH

SPEC Toolbox Partner

About KLH

KLH, established in 1996, has been a trailblazer in helping grow the market of mass timber to what it is today. In 2020, the company expanded its production capacity with the launch of a second state-of-the-art manufacturing facility and is widely recognized for its responsible approach to resource-efficient construction.

With nearly 30 years of experience and more than 50,000 completed projects worldwide, KLH offers comprehensive technical advice and support throughout the project lifecycle, including shop drawings and connections support.

Frequently asked questions

Design With KLH

Are the KLH calculators free to use?
Yes. The KLH calculators on SPEC Toolbox runs free in the browser. No download, no license, no account needed to design and verify with real manufacturer data.
What standard are KLH® - CLT panels designed to?
In Europe, KLH® - CLT panels are verified to Eurocode 5 together with the product's ETA-06/0138. In Australia the same products are checked to AS 1720.1. In the US, KLH® - CLT is evaluated under CCRR-0434, and in Canada under a dedicated Canadian evaluation report.
Which KLH products are integrated?
CLT is integrated for Australia, Europe, the USA and Canada --- the only partner currently live in all four regions. 1 product system in total. Switch region to see the set for other markets.
Can I design connections into KLH® - CLT panels using any supplier's screws or brackets?
Yes. The calculator lets you pair KLH® - CLT panels with screws or brackets from any integrated supplier, verifying the connection against KLH's real material properties.
Where does the capacity data come from?
Directly from KLH's published certifications for each region: European Technical Assessment ETA-06/0138 in Europe, CCRR-0434 in the US, and a Canadian evaluation report in Canada. Nothing is averaged or re-derived.
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