Wood is one of the oldest construction materials, and the only naturally renewable material.
In the cross
section of a log, the outermost layer is known as bark. This layer is dense and
rough.
Inside the bark
presents a thin layer of wood cells, namely cambium. This is where the tree
growth takes place continuously.
The growth of tree
over time forms annual rings. The number of rings can roughly tell us the age
of a tree.
Generally, rapidly
growing tree has wide annual rings and thus, it produces coarse-grained wood.
The center of a
log is known as pith.
A cross section of
log can be segmented into two regions. The inner region is made up of dead
tissue, and it primarily provide the support to the tree. This region is known
as heartwood, and it is darker, drier and harder than the outer region,
sapwood.
Sapwood on the other
hand, is more permeable than heartwood. Nonetheless, the strength and density
of both regions do not vary significantly.
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