Integrated Partner

Design with Södra CLT Panels

Södra manufactures FSC-certified CLT panels for mass timber, integrated into SPEC Toolbox with ETA-24/1212-certified data on every panel. Size, verify and specify a Södra floor or wall build-up into the project you're designing, verified to Eurocode 5 under ETA-24/1212. Every value comes from Södra's own charring-rate and production specification, not a generic catalogue number. Södra is Sweden's largest forest owners' association, extending its long-term, environmentally conscious approach from forestry into wood products and construction materials.

Explore The Integrations → Powered by SPEC Toolbox. Real ETA-24/1212-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
Integrated product system available now in Europe.

The Södra system, ready to design

Integrated product system available now in Europe.

Europe
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CLT

CLT

Eurocode 5 (EN 1995-1-1) Calculator →
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About Södra

Södra is Sweden’s largest forest owners’ association, owned by more than 50,000 family forest owners. Founded in 1938, Södra creates value throughout the entire forest-based value chain, from sustainable forest management and timber supply to the production of sawn timber, pulp, bioproducts, renewable energy, and innovative building solutions. With a long-term commitment to sustainability, Södra maximizes the value of every part of the forest while contributing to a more circular and climate-smart society.

Södra’s CLT panels are made from FSC-certified spruce, customizable up to 3.5 metres in height and 16 metres in length, produced using fossil-free energy generated on-site, resulting in one of the lowest carbon footprints on the market.

Frequently asked questions

Design With Södra

Is the Södra calculator free to use?
Yes. Every Södra calculator on SPEC Toolbox runs free in the browser. No download, no licence, no account needed to design and verify with real manufacturer data.
What standard are Södra CLT designed to?
Södra CLT is verified to Eurocode 5 under European Technical Assessment ETA-24/1212.
Which Södra products are integrated?
CLT is integrated for Europe. 1 product system in total.
Can I design connections into Södra CLT using any supplier's screws or brackets?
Yes. The calculator lets you pair Södra CLT with screws or brackets from any integrated supplier, verifying the connection against Södra's real material properties.
Where does the capacity data come from?
Directly from Södra's published ETA-24/1212 assessment and production data. Nothing is averaged or re-derived.
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