timber

Preservation of timber | Methods – civil learners

PRESERVATION OF TIMBER Timber has to be preserved from moisture, dry rot or internal decay and from the attacks ofinsects. Paint on seasoned timber preserves it from moisture and extends its life indefinitely ifrenewed periodically. Many processes has been adopted for protecting the timber from dry rot andinsects by impregnating it with chemical substances. Tarring, …

Preservation of timber | Methods – civil learners Read More »

Storage of timber on site – civil learners

STORAGE OF TIMBER The converted timbers should be properly stored. For the purpose of storage, suitable stacks of timber pieces are formed. The timber pieces are arranged in layers and the layers are separated by wooden spacers. The stock is protected from direct sun, dry wind and rain.  The image explains more than the words …

Storage of timber on site – civil learners Read More »

Conversion of timber | Methods – civil learners

CONVERSION OF TIMBER The cutting up of timber to form planks, battens, etc. of required sizes by saw is called conversion. Power machines are employed in several stages when working on a large scale. During conversion the allowance should be made for shrinkage, squaring and planning. It is about 3 mm to 6 mm. The …

Conversion of timber | Methods – civil learners Read More »

Defects of timber | Prevention – civil learners

DEFECTS IN TIMBER The defects occurring in the timber are grouped into the following five divisions: 1. Defects due to fungi2. Defects due to insects.3. Defects due to seasoning.4. Defects due to natural forces.5. Defects due to conversion 1) Defects due to fungi:  The fungi are minute microscopic plane organisms. Following defects are caused in …

Defects of timber | Prevention – civil learners Read More »

Classification of timber – civil learners

Classification of Timber Depending upon their mode of growth trees may be divided into the following categories: 1)Exogenous trees: These trees increases in bulk by growing outwards and distinct consecutive rings are formedin the horizontal section of such a tree. These rings are known as the annual rings because one suchring is added every year …

Classification of timber – civil learners Read More »