Wood preservation by Barry A Richardson

By Barry A Richardson

The hot version of this accomplished learn of nationwide and overseas study and alertness into wooden protection is either good certain and vast in assurance. The textual content covers the historical past of maintenance: the anatomy of timbers and their breakdown, protection ideas, fabrics and methods.

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Three of the families are of only limited significance; the Mastotermitidae are represented by only a single primitive species in northern Australia, the Termopsidae include three species that infest buildings in North America, and the Hodotermitidae are confined to semi-desert areas of South Africa, North Africa and the Middle East. The remaining three families are of considerable significance as they contain the more important wood-destroying termites. The family Termitidae is a large and mixed group which includes the subterranean and the mound termites, which construct nests under the ground, on the sides of trees or as mounds on the ground.

This colour is particularly intense in spruce and lighter in larch. The attack is typical of dote, appearing on the cut surface as tiny white pockets of rot filled with growth like small pieces of cottonwool. If dote is suspected but not apparent in this way it can usually be detected by lifting the fibres with a knife; if they are long and springy the wood is sound but decay must be suspected if they are brash and break readily across the grain. Any dote activity that redevelops in wood in service can be ultimately attributed to the germination of a spore, perhaps on a branch scar on a standing tree or a log lying in the forest.

The first group contains the Microcerotermes, Amitermes and Nasutitermes species which depend on prior infection by a fungus to convert cellulose to a digestive form. Lignin is not digested and is passed through the gut, providing the raw material for the construction of the typical honeycomb nests and covered walkways. In contrast the group containing the Macrotermes, Odontotermes and Microtermes species is not restricted to wood already infected by fungus but instead these termites convert all cellulose to a digestible form in fungal gardens within their nests.

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