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Disaster Advice Glossary
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Disaster recovery and restoration can be veiled in mystery to the many who have not undertaken specific training. This glossary explains technical terms to assist both report writing and the understanding of those technical terms so often misunderstood.
Definition
| Bound Water: |
Water molecules that are held together in wood building material cells once they are saturated. Education Note: Bound water in saturated wood cells is partially responsible for wood cupping, warping, crooking and twisting. This water cannot easily become vaporized and removed by normal drying processes without the aid of mechanical dehumidification equipment. See Adsorption, Free Water |
| Free Water: |
Education Note: 1) In flooded buildings, it is the standing water that is easiest to remove. 2) In some wood and the cut of the wood, free water is moisture held in the lignin cells of the wood, which will easily evaporate. Bound water in wood is opposite of free water. See Bound Water |
| Hygroscopic Building Materials: |
Building materials which have a natural affinity to hold and retain water and moisture vapour, especially building materials when indoor humidity exceeds 70% for periods of time. Restorative Drying Note: a) Building materials, such as blown acoustic ceilings and acoustic tiles, drywall and wall insulation, which attract, readily absorb, and take up water and moisture vapour. b) Once saturated, hygroscopic building materials will not release their water and moisture vapour as fast as they retained it. c) Hygroscopic building materials when wet or damp, are typically those materials that aid in the distribution of spores. See Bound Water, Moisture Content, Moisture Vapour. |
| Lignin: |
A polymer contained in the structure of wood along with cellulose that forms the essential part of the woody tissue, making up the greater part of the weight of dry wood. Mitigation Note: Natural biodegradation of lignin is slow, and it takes place only in aerobic environments. Increased biodegradation and decomposition of wood is a result of fungi infestation. See Bound Water, Poria, Wood Rot |
| Saturation Point: |
The point at which a porous material are no longer able to hold and retain moisture or a liquid. Technical Note: In wood or lumber, saturation point is approximately 25/35% moisture content. See Bound Water, Free Water, Moisture Content. |
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The Disaster Advice Glossary operates on TechMerit Technoloy.
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