Building Product Brochures & Datasheets

Protective Timber Coatings

SAWPA | Sapwood and Heartwood

A tree trunk has three main zones; the bark, the sapwood and the heartwood. Trees are basically triangular in shape and they gain height by growing outwards and upwards. At the start of each growing season, a new layer is added to the outside of the wood so that every part of the tree gets bigger – roots, trunk, branches and twigs.


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