Appearances can be deceptive

TRADA image

Philip O'Leary, head of TRADA Technology's Structural Investigations team, highlights his concerns about a lack of understanding in the industry about timber strength grading issues.

Timber as a natural material, is inherently variable, even within a single species. Strength grading of softwood and hardwood overcomes this, by assessing the strength and stiffness of individual pieces intended for structural use and assigning them to a strength grade and/or strength class. Specifiers can then work with known and dependable mechanical properties.

Article from the TRADA Timber Industry Yearbook 2011

Suggested Reading

Round timber in construction: Notes for structural designnavigation-arrow

The use of round timber for structural applications can provide designers with attractive features in sympathy with local surrounding in a range of applications from housing and agricultural buildings to major engineering structures such as bridges.

Structural engineers are often faced with little information on designing with round timber...

01/01/2004 |  Other Technical Guidance  

Constructional timber: Fact sheet no. 3navigation-arrow

This wood for good fact sheet is an introductory document to constructional timber.

The sheet contains tips, guides to marking and span tables for C16 and C24 floor joists. 

Contents:

  • Tips
  • Markings
  • Species
  • Specifications
  • Span tables for domestic floor joists: C16 timber
  • Span tables for domestic floor...

01/01/2004 |  Info from other organisation  

Softwood sizesnavigation-arrow

Timber is an internationally traded material and the UK has
traditionally imported timber from a wide range of countries, as
well as producing its own. A large range of sizes are available
throughout Europe, with individual countries having different
traditions as to the sizes in common use.

This Wood Information...

01/03/2019 |  Wood Information Sheet