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Excerpt from Framing, Sheathing, and InsulationThe series of concentric rings sur rounding the pith are formed by the growth of the tree, one ring being added on the out side each year, hence the name, annual rings. These annual rings, as shown in the enlarged section, Fig. 1 - 2, are composed of fibers or long tubes running parallel to the trunk of the tree. The annual rings are crossed by fibers or cells that run from the bark of the tree to...

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Excerpt from Framing, Sheathing, and Insulation While a tree is living, both the cells and cell walls are filled with water. As soon as the tree is cut, the water within the cells begins to evaporate. This process continues until practically all of the "free water" has left the wood. When this stage is reached, the wood is said to be at the fiber-saturation point, that is, what water is contained is mainly in the fiber walls. There is no cha...

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