Timber is a sustainable natural, renewable material that is consumed in a non-sustainable manner.  The LPSA system redresses this peculiar anomaly.  SDT represents over 90% of all wood fiber in nature.  By adopting SDT as a cheaper and superior alternative to structural (mature) timber, World’s forests could be spared, wealth (from SDT added value) would be created and advances from other fields of engineering science would become applicable to the rather backward field of timber engineering.

The embedded bolted joint, Minnetonka, MN, USA. (Building now demolished)
The embedded bolted joint, Minnetonka, MN, USA. (Building now demolished)

The embedded bolted joint used in the (now demolished) ice rink at Minnetonka, MN, USA.  The Forest Products Laboratory, USA and TRADA, UK also further similar joints.

A view of the Minnetonka ice rink structure, demolished in 1997 because of a roof leak.  Impossibility of any meaningful structural analysis (due to nature of the joints) meant that integrity of the structure could not be assessed.

Structural applications of SDT are severely limited by the lack of technically sound, commercially viable connection methods.  The most prevailing method is the wire-laced embedded connection (right).  This is supposed to be an “improved” version of the original bolted embedded form (two pictures below).  Embedded connections are carpentry procedures with no engineering basis or back-up.  Indeed, they amount to “analysis black boxes” inhibiting any progress in SDT engineering in the age of computers.


All of the following expert entities are aware of the LPSA technology.  None of them has been able to challenge it, so they simply ignore it.  Their own carpentry solutions (above) are devoid of any engineering analysis element or commercial viability.


· An European-funded consortium from: Austria, Finland, France, the Netherlands and UK.  Their final report (1999) is at: www.vtt.fi/inf/pdf/publications/1999/P383.pdf


· The Forest Products Laboratory, USA.  See: www.fpl.fs.fed.us/research/units/fpmu/small_diameter_roundwood.shtml


· TRADA, UK (Timber R&D Association):  www.forestry.gov.uk/pdf/crwoodproducts27.pdf/$FILE/crwoodproducts27.pdf

           Note:  this file cannot be found anymore.

Below are the carpentry techniques for SDT jointing used by the World’s experts.  They render impossible any meaningful engineering analysis: