MOSO® Bamboo X-treme® Sub Frame Joist

MOSO® Bamboo X-treme® sub frame joists are made of the same material as MOSO® Bamboo X-treme® decking boards: Thermo-Density® heat-treated bamboo, made from compressed bamboo strips.

This unique heat-treatment process at 200°C provides MOSO® Bamboo X-treme® with the highest durability class possible in the appropriate EU norms  and the compression increases the hardness and stability.

MOSO® Bamboo is a sustainable alternative to tropical hardwoods and composite products, boasting best in class for its environmental credentials, strength, stability, and longevity, whilst achieving a Euroclass B fire rating without the need for external treatment.

We recommend the use of Bamboo X-treme® sub frame joists, which are specifically produced for use in combination with MOSO® decking, to optimise the longevity and performance of your deck.

25-Year Gripsue Performance Warranty

Features & benefits

  • Durability class 1 (in accordance with EN350)
  • Euroclass B fire rated (in accordance with BS EN 13501-1:2018)
  • Net carbon sink over its lifespan
  • Outstanding stability
  • Low maintenance
  • Weathers to an attractive silvery grey. Can be stained or oiled to maintain original colour if desired
  • Expected service life of 30-50 years
  • 25-year product warranty


Dimensions: 2440 x 60 x 40 mm
Edges: Square edge
Finish: Unfinished