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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
| Back Pressure: |
A forced air pressure, which is present by design or error. In water damages when using air drying fans, back pressure is a result of the improper use of air drying equipment. Back pressure in this instance is the restriction of air velocity while trapping humidity in a wall, to a cabinet or corner. Back pressure can be present when drying fans are positioned improperly under wet carpets and to wall cavities. |
Vapour Pressure as Back Pressure In Concrete: |
Vapour Pressure as Back Pressure In Concrete: A misnomer and common conception, that concrete appears to represent itself as having or producing a vapor back-pressure. Education Note: Vapour pressure rises and falls according to the two variables of temperature and humidity. Vapour pressure is "not" capable of accumulating or producing a "build-up of trapped vapor pressure" The term "back pressure" as it relates to vapor pressure in concrete probably came about in an attempt to explain the higher volume of moisture accumulation that may occur in the uppermost layer of concrete (after covering it with a low-permeable, or non-permeable flooring material or sealer). Moisture that collects in this fashion is usually due to improper concrete curing, which has resulted in a surface with demonstrable higher permeability and porosity than the interior section of the concrete. The higher permeability and porosity of the surface allows a "reservoir effect" to occur, which will temporarily result in higher than normal vapor emission measurement after the floor covering is removed. The vapor pressure readings will return to "normal" when the stored moisture is allowed to be expelled. |
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The Disaster Advice Glossary operates on TechMerit Technoloy.
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