Theoretical Strength of Wood

The theoretical limits of wood strength are impressive. The strength of a cellulose molecule dwarfs the values associated with high strength steel (Table 10.1). Individual fibres are incredibly strong in tension, but once assembled into solid wood, much of this potential is lost because of weakness across the grain. 

The real advantage of timber structures over steel and concrete equivalents usually lies in their strength to weight ratio. Wood has a very high strength to weight ratio and therefore requires a less massive foundation for an equivalent load. Timber is also aesthetically pleasing and non-corrosive. 

Timber, allowable working stress in tension along the grain 10 

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