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Disaster Advice
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.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

The Disaster Advice Glossary and its contents are the protected copyright of Disaster Advice
 

Habitat

The specific living area and surroundings in which microorganisms and humans live a part or together.

 

Halogenated Hydrocarbon

A chemical material that has a carbon element plus one or more of these elements. Halogenated hydrocarbons include chlorine fluorine bromine and iodine.

 

Hand Protection

The appropriate protection necessary to protect hands and wrist from exposure abrasion infection sharps and cuts. 29 CFR 1910.132 and 138.

 

Hanta Virus

A virus that is associated with urine feces and saliva settled in dust from wild mice more particularly the deer mouse. Adjusters and contractors who must access and inspect damage under or in old dusty/dirty buildings should do so by wearing proper respiratory protection. For more information contact EME for a free Hanta Virus Fact Sheet or contact the Center of Disease Control and Prevention through www.cdc.gov - or - www.cdc.gov/ncidod/diseases/virlfvr/virlfvr.htm

 

Hardness

In water the amount of measurable calcium and magnesium salts dissolved in water. Hard water has a direct relationship with soaps and detergents to act and respond as cleaners. Soaps and detergents work better and in less amount when soft water is available.

 

Hardware

In the past hardware meant hard surface items having a finish such as door locks and drawer pulls. More recently hardware is associated with the plastic case and general working parts of a computer.

 

Hardwood Floor Cupping

In water damage mitigation hardwood floor cupping of strip flooring is a sign of trapped moisture under the hardwood underlayment and possibly trapped moisture vapor in the hardwood matrix. Restorative Drying Note Proper drying techniques and dehumidification along with acclimation of the floor over a month or so can result in the hardwood floor to return back to its previous condition. Sanding the hardwood floor prematurely by removing the cupped edges can become an appearance problem in the future.

 

Hat Banding

A painting condition brought about from painters who use a brush to cut around molding and door frames with a paint that has slight colour acceptance problem and also when the shear from the brushed areas changes the colour and/or sheen. Then when the full wall is either sprayed or rolled there is a definite band framing the entire painted area. Some painters refer to this also as picture framing.

 

Hazard

Any physical property or chemical agent capable of causing harm to humans animals environment and to building materials.

 

Hazard Class Identification Abbreviations

The words of a class of hazard that are abbreviated such as B for Biohazard C for Carcinogen F for Flammable I for Irritant for Mutagen O for Oxidizer P for Pyrophoric R for Radioactive S for Sensitizer T for Teratogen W for Water Reactive X for Toxic and Z for Corrosive.

 

Hazard Identification

The determination of a possible adverse health effect. It is the identification of agents their frequency and duration of exposure which may lead to adverse health effects. Health and Safety Note Hazard identification is the identification of all suspected conditions that may pose inhalation or skin absorption hazards that may be immediately dangerous to life or health or other conditions resulting serious harm or death. Hazard identification shall be identified early on in the survey and evaluation phase and it should not be found unexpectedly resulting in exposures to employees. Examples include confined space entry harmful atmospheres potential explosive situations visible vapor or fume clouds or environments where biological indicators are present. Hazard identification means any obvious hazard or potential hazard which a qualified person deems to be a known or suspected hazard to human or environmental health.

 

Hazard Index

The sum of two or more hazard quotients for chemicals and other hazards including biological release or concern over a multiple exposure pathways to a particular receptor or both.

 

Hazard Quotient

The ratio of the level of exposure of a chemical or other substances including biological of concern over a specific time period to a reference dose for that contaminate or agent of concern derived for a similar exposure period.

 

Hazardous Ingredients

Any substance which by itself or in combination with other ingredients poses a direct threat to life or health.

 

Hazardous Material

any chemical vapor or material which in sufficient quantities or concentration poses a direct threat to health or property. Any biological agent or other disease causing agent which after release and upon exposure ingestion inhalation or assimilation into a person either directly or indirectly which has a potential for causing or resulting in illness and disease.

 

Hazardous Materials Response Team HAZMAT

An organized group of employees designated by the employer which is expected to perform work to handle and control actual or potential leaks or spills of hazardous substances requiring possible close approach to the substance. The team members perform responses to releases or potential releases of hazardous substances for the purpose of control or stabilization of the incident. A HAZMAT team is not a fire brigade nor is a typical fire brigade a HAZMAT team. A HAZMAT team however may be a separate component of a fire brigade or fire department. See HAZMAT

 

Hazardous Substance

Hazardous substance is any substance which scientists have shown by a minimum of one scientific study to pose a threat to human and animal health and to other living organisms Any chemical that poses a threat to human health or the environment if released in significant amounts c Any material which falls under Federal and state statutes and regulations including descriptions and lists of hazardous substances. Education Note Certain substances and materials are federally regulated as hazardous under Sections 311b or Section 307 of the Clean Water Act Section 112 of the Clean Air Act Section 3001 of the Resource Conservation and Recovery Act Section 102 of the Comprehensive Environmental Response Compensation and Liability Act Section 7 of the Toxic Substances Control Act Title 40 Section 302.4 of the Code of Federal Regulations and state codes and regulations such as California Proposition 65. Education Note The consequence of a hazardous substance exposure may result in property damage through chemical fire water explosion etc. There are an estimated 27000 materials in commercial use in America and about 25 million workers in America who are exposed daily to a hazardous substance.

 

Hazardous Substance

Any substance designated or listed under A. through D. below exposure to which results or may result in adverse affects on the health or safety of employees Any substance defined under Section 10114 of CERCLA or under Sections 25316 and 25317 of the California Health and Safety Code. Other states have similar codes Education Note Any biological agent and other disease-causing agent which after release into the environment and upon exposure ingestion inhalation or assimilation into any person either directly from the environment or indirectly by ingestion through food chains will or may reasonably be anticipated to cause death disease behavioral abnormalities cancer genetic mutation physiological malfunctions including malfunctions in reproduction or physical deformations in such persons or their offspring c Any substance listed by the U.S. Department of Transportation and regulated as hazardous materials under 49 CFR 172.101 and appendices and d Hazardous waste as herein defined. See CERCLA

 

Hazardous Substance Removal Work

Clean-up work at any of the following A site where removal or remedial action is taken pursuant to any of the following 1. Chapter 6.8 commencing with Section 25300 of Division 20 of the California Health and Safety Code regardless of whether the site is listed pursuant to Section 25356 of the Health and Safety Code. 2. The federal Comprehensive Environmental Response Compensation and Liability Act of 1980 42 U.S.C. Sec. 9601 et seq.. 3. Any operations covered under subsections1 through 1C of this section. A site where corrective action is taken pursuant to Section 25187 or 25200.10 of the California Health and Safety Code or the federal Resource Conservation and Recovery Act of 1976 42 U.S.C. Sec. 6901 et seq. c A site where clean-up of a discharge of a hazardous substance is required pursuant to Division 7 commencing with Section 13000 of the California Water Code. d A site where removal or remedial action is taken because a hazardous substance has been discharged or released in an amount that is reportable pursuant to Section 13271 of the California Water Code or the federal Comprehensive Environmental Response Compensation and Liability Act of 1980 42 U.S.C. Sec. 6901 et seq.. Hazardous substance removal work does not include work related to a hazardous substance spill on a highway.

 

Hazardous Waste

A waste or combination of wastes as defined in 40 CFR 261.3 or regulated as hazardous waste in California pursuant to Chapter 6.5 Division 20 California Health and Safety Code or B. those substances defined as hazardous wastes in 49 CFR 171.8.

 

Hazardous Waste

Hazardous waste are the generated and discarded materials that may pose cause or significantly contribute to serious illness or death Any by-product that is capable or potentially capable of posing a direct or indirect threat to life or health or compromise the well-being of a community. c A hazardous waste which has at least one or more characteristics that can produce an ignitability corrosivity reactivity or toxicity d Hazardous waste includes regulated waste that are part of but not limited to the Comprehensive Environmental Response Compensation and Liability Act CERCL and Title 40 Part 261 of the Code of Federal Regulations e Hazardous waste includes waste that individual states and agencies including EPA and OSHA have deemed to be hazardous and require the regulated handling and disposal of the waste. Education Note In the case of unregulated hazardous waste the waste still requires proper handling and disposal such as in a landfill as required by industry standards and local regulations.

 

Hazardous Waste Operation

Any operation conducted within the scope of governmental regulations including hazardous substance removal work.

 

Hazardous Waste Site

Any facility or location at which hazardous waste operations within the scope of governmental regulations take place.

 

HAZMAT Hazardous Materials Management Team

A team of qualified individuals who are professionally and technically trained to mitigate or control a hazard. Education Note Under OSHA standards any person who is an emergency responder and who is sent into a known or potentially dangerous or hazardous environment must comply with 29 CFR 1910.120.

 

Head Protection

Appropriate protection against falling objects and projectiles and contact with a sharp or blunt object. 29 CFR 1910.135 ANSI Z89.1 NFPA 1993/1997.

 

health Effects

Effects from agents and chemicals which cause impairment or damage to humans.

 

Health Hazard

Any chemical mixture of chemicals or microbiological pathogens for which there is a statistically significant evidence based on at least one study conducted in accordance with established scientific principles that acute and chronic health effects may occur in exposed employees Health and Safety Note The term health hazard includes chemicals which are carcinogens toxic or highly toxic agents reproductive toxins irritants corrosives sensitizes hepatoxins nephrotoxins neurotoxins agents which act on the hematopoietic system and agents which damage the lungs skin eyes or mucous membranes and it includes stress due to temperature extremes.

 

Heat

The form of energy that is transferred by virtue of a temperature difference.

 

Heat Exchanger

A mechanical device specifically designed to transfer heat between two physically separated fluids.

 

Heat of Fusion

Latent heat involved in changing between the solid and the liquid states.

 

Heat of Vaporisation

Latent heat involved in the change between liquid and vapour states.

 

Heat Pump

In HVAC a refrigerating system employed to transfer heat into a space or substance. The condenser provides the heat while the evaporator is arranged to pick up heat from air water etc. By shifting the flow of air or other fluid a heat pump system may also be used to cool the space.

 

Heat Stress

Heat stress is a medical condition where by workers are exerting energy above the body ability to adapt to the stress. Education Note Heat stress results in a temperature increase of the body normal 98.6%u00B0F 37%u00B0C. Malfunctioning or overload of the body temperature and sweat mechanisms results in heat stress. Poor adaption to heat may lead to heat cramps heat exhaustion or heat stroke. Excessive environmental heat can result in a conditioned called prickly heat. There are three primary causes of heat stress insufficient water intake insufficient salt intake and a deficiency in the production of sweat the evaporation of which helps to cool the body naturally. Health and Safety Note Heat stress or heat exhaustion can result in a more life-threatening condition called heat stoke which is an overexposure to extreme heat where the body can no longer provide a natural regulation of the heat. The body overheats and core temperatures may reach 107%u00B0F which can result in a coma and death.

 

Heat Stress Protection

The appropriate level of protection necessary to insure that employees do not become exhausted or over heated while performing a task. Heat stress protection includes the proper amount of breaks rest periods replacement of body fluids and electrolytes control of temperature and humidity. NIOSH 86-113

 

Heat Latent

Change of enthalpy during a change of state usually expressed in BTUs per pound BTU/lb. With pure substances latent heat is absorbed or rejected at constant pressure.

 

Heat Sensible

Heat which is associated with a change in temperature specific heat exchange of temperature in contrast to a heat interchange in which a change of state latent heat occurs.

 

Heat Specific

The ratio of the quantity of heat required to raise the temperature of a given mass of any substance one degree to the quantity required to raise the temperature of an equal mass of a standard substance usually water to 59%u00B0F one degree.

 

Heat Total

The sum of sensible heat and latent heat between an arbitrary datum point and the temperature and state under consideration. See Enthalpy

 

Heightened Awareness

A sense or tendency of a person after a flood or fire to perceive that the interior environment or contents are somehow different than what they were prior to the exposure. Education Note The heightened awareness by a claimant is an impression or perception about their environment after the fact whether real or perceived to them the smells to the indoor environment and/or contents are a concern. Often other persons such as contractors and adjusters cannot smell sense or experience the same heightened awareness as the claimant. Mostly this is due to the fact they have no prior memory which may help them recognize or trigger what the environment use to smelled-like. Some persons are sensitized and even de-sensitized to certain smells and odors. Each persons sensory receptors are different and what may be an acceptable smell or odor to you may not be acceptable for another person. c Some contractors get themselves into trouble because they never asked the claimant at the time of loss if they any of their family or employees have asthma or allergies or are chemically sensitive. If the answer to any of your questions is yes you may need to modify your mitigation strategy. d Adding fragrances and masking agents to the interior environment after a flood sewage or a fire may trigger some persons heightened awareness sensations which may cause the contractor to completely clean and restore the interior of a home. The court action costs the contractor insurance company over %u0024500-K. See Limonene Sensory Perception

 

HEPA High Efficiency Particulate Appliance

Meaning the ability of a material or appliance to stop a particle from passing through a material or appliance at an efficiency rate of 99.8%u0025 of airborne particles at 0.3 microns in diameter or larger.

 

HEPA Air Scrubber High Efficiency Particulate Air Scrubber

Depending on the application it is a machine that has an air intake and one or more of- prefilters HEPA filters %u005BCarbon Filters%u005D plenum motor and exhaust that is contained in a metal housing. Mitigation Note HEPA air scrubbers-scrub and remove contaminated air allowing cleaner air to remain in a building. For example asbestos and lead abatement contractors must use HEPA filtered air scrubbers machines during abatement. When fungi and bacteria contaminated building materials are removed from buildings air scrubbers must be installed for the protection of employees and for the reduction of cross-contamination in non-contaminated areas. See Air Scrubbers HEPA Filters HEPA Sanders HEPA Vacuums

 

HEPA Filters High Efficiency Particulate Air Filter

In a respirator a disposable dry-type filter having a particle removal efficiency of no less than 99.97 percent for 0.3 micron size particles. HEPA filters on a respirator are worn donned by technicians in the protection from fine dust and spores entering their lungs. HEPA filters are used in air collection machines and vacuums to remove micro-fine particulates from air and surfaces. See HEPA Air Scrubber HEPA Vacuum

 

HEPA Sanders High Efficiency Particulate Air Sanders

Special industrial-type sanders that are made to capture the sanded air particulates while the vibrating or circular sanders are on. All dust and debris from the sander is extracted through the sanding tool and back to a connected HEPA vacuum through a hose. Mitigation Note While these sanders are used for lead-base paint removal they are also used for mold mitigation.

 

HEPA Vacuum High Efficiency Particulate Air Filtering Vacuum

Vacuuming equipment specially manufactured and designed to remove settled and loose contaminates from a surface and the vacuum filter not release the debris and micro-fine dusts back in air through the exhaust. Education Note The HEPA vacuum retains all micro-fine debris and it will not release or redistribute captured particles larger than 0.03 microns in size in air. For industrial size vacuums the HEPA vacuum filter is rather expensive and usually one or two prefilters precede and protect the HEPA filter. HEPA stand up vacuums can be purchased for residential use but in commercial applications including the containment of asbestos and lead-base paints only industrial rated HEPA vacuums can be used. In some states if asbestos and lead is being contained and controlled in the HEPA vacuum each vacuum must have a state registration number on it. The registration number is issued and renewed yearly by the state as long as the vacuum can meet the performance and leakage test. Industrial HEPA vacuums are used in mould and fungi mitigation and abatement. Dangerous fungi mycelial fragments mold toxins and cell parts are captured and retained in the HEPA vacuum. See HEPA Air Scrubber HEPA Filters

 

Hepatitis

Inflammation of the liver. A virus caused disorder transmitted to humans from contaminated water and solid sewage waste resulting in Hepatitis. See Hepatitis-A and B

 

Hepatitis-A

A virus commonly found in dirty water and sewage.

 

Hepatitis-A Virus Vaccination

The vaccination medical professionals give for prevention of sewage related bacterial disease including hepatitis-A. Health and Safety Note Emergency response technicians who come in contact with gray water and sewage effluents as part of their job should have the Hepatitis-A vaccination while persons coming in contact with blood and blood products are encouraged to acquire the Hepatitis-B vaccination. Employers are mandated to make available the vaccinations at no cost to workers having known or potential occupational exposure. See Tetanus

 

Hepatitis-B

A virus that is associated with blood and human body secretions.

 

Hepatitis-B Virus Vaccination

A vaccination which protects workers from the hepatitis-B virus strain. Health and Safety Note Employers are mandated by law to offer the vaccination to employees who come in contact with potential hepatitis contaminates sewage blood and other potentially infectious materials OPIM.

 

Hepatitis-C

Currently there are no vaccinations or protection against Hepatitis-C virus. Health and Safety Note Many water damage remediation technicians ask about Hepatitis-C vaccination. There are none at this time. Most likely workers are confused between the Hepatitis B and C virus and vaccinations. Health Note Recently the Hepatitis-C virus has become more of a health concern than HIV-AIDS infections.

 

Hermetically Sealed Environment

An air tight environment that keeps contaminates either in or out. Hermetically sealed environments are necessary in asbestos lead and mould abatement. Even though abatement contractors may not define containment as being hermetic in actuality the containment engineering controls for such an environment are required.

 

Hidden Damage

Any damage which is or may be under a floor above a ceiling or inside a wall cavity. Health Note Hidden damage includes not identifying fungi or bacteria which is not apparent or where the microscopic damage cannot be seen with the human eye.

 

High Hazard Work Environments

Any job or task which has a strong likelihood of an employee coming into direct contact with a hazard or hazardous substance and atmospheres and environments which may contribute to that employee having a direct risk to their life and health.

 

Higher Levels of Building Standard Cleanliness

No two buildings are alike and some buildings require more care than others in maintaining good IAQ. Medical-surgical and patient recovery areas scientific laboratories and computer chip manufacturing for example must receive a higher level of maintenance and indoor air quality care than do most general office buildings and homes.

 

High-rise Drying

In water damage remediation it is the use of mechanical and engineering controls necessary to dry a wet high-rise building properly. Investigation and Restorative Drying Note High-rise or multi-story flood remediation requires a great amount of knowledge from building engineers about the building structural components air pathways and ventilation chases for electrical lift and ventilation shafts pressure differentials between walls plumbing and other conduit runs between floors. Drying a wood frame 4-floor wood frame and floor building can vary considerably when attempting to dry a similar 4-floor concrete high-rise having a pan floor for example. c Finding all the sources of water intrusion and moisture vapor can be half the battle in drying a wet high-rise building properly. See Substructure Drying Building Drying

 

Histoplasmosis Capsulatum

Histoplasmosis capsulatum is a soilborne fungus and feces infection from pigeons other birds and bats. The inhalation infection can result in lung related fungi and meningitis infections in humans. See Cryptococcus

 

Holdout

A painting condition that results from a paint having the ability to lay on top of a surface and not soak into the substrate.

 

Horsepower

Unit of power in foot-pound-second system work done at the rate of 550 ft-lb per sec or 33000 ft-lb per min. The force required to raise 33000 pounds at a rate of one foot per minute.

 

Hospital Sewage

Mostly non-regulated waste containing human sewage blood infections diseases and illness and chemotherapy waste. Health and Safety Note Hospital sewage is a health concern to plumbers who have direct contact with sewage on the premise of the hospital. It is thought and believed by OSH that there are no additional health concerns to sewer employees or plumbers who come in contact with blood potential having HBV or HCV once the sewage and OPIM enters the main stream of the sewer system. See Commercial Sewage Domestic Sewage Industrial Sewage

 

Host

A material person or organism for which bacteria viruses and fungi can use to live thrive and support their nutrients by.

 

Hot Deck

In a heating system a hot deck is the heating section of a multi-zone system which includes the heating coil and duct.

 

Hot Gas By-pass

In a heating system a hot gas bypass is the valve used to introduce compressor discharge gas directly into the evaporator. This type of arrangement will maintain compressor operation at light loads down to zero by falsely loading the evaporator and compressor.

 

Hot Spot/Hot Zone

An informal expression designating a specific area or zone as being the primary pollutant or contamination spot.

 

Hot Water Extraction

A hot-water restorative cleaning method used in water damage mitigation and sewage clean-up to suspend and remove loose contaminates off of a surface.

 

Hot Water Washing

A preferred water-base cleaning method for clothes and building fabrics including carpets and some upholstery for the removal of oils soils and organic debris. Hot water washing includes the use of detergents followed by agitation rinsing and thorough drying.

 

Humidifier Fever

A respiratory disease that results in influenza-like symptoms. It is also referred to as air-conditioning fever. It is caused by exposure to toxins that are emitted by microorganisms which are aerosolized in the breathing space of persons. Health and Liability Note A particular concern is contractors who aerosolize surfaceborne dusts and organic waste into the air especially when ongoing biological growth or smell is apparent in air. The water damage contractor must ask all persons exposed to dusts fungi and micro-pollutants during building drying to leave the effected building area until the building is dried dehumidified sanitized and returned back to its pre-loss state. In addition the employees of the remediation contractor must wear appropriate PPE. See Personal Protective Equipment PPE

 

Humidifier Lung

A type of allergic lung condition that is common among workers involved with refrigeration and air conditioning equipment. The allergy is produced by two kinds of fungus micropolyspora and thermoactinomyces. Symptoms of the short-term form of the disease include chills cough fever difficult breathing loss of appetite nausea and vomiting. The long-term form of the disease is known by fatigue cough weight loss and difficult breathing during exercise. Also referred to as air conditioner lung.

 

Humidistat

A regulator device actuated by changes in humidity used for the automatic control of relative humidity.

 

Humidity

The measurement of moisture and moisture-vapor in air. See Absolute Humidity Ambient Humidity Relative Humidity

 

Humidity Gradient

The measurement of ambient indoor humidity at different layers or heights where the ambient humidity monitoring shows an increase or decrease of humidity.

 

Humidity Ratio

The ratio of the mass of the water vapor to the mass of dry air contained in an atmosphere at the same temperature.

 

Humidity Absolute

The total amount of water vapour present in a system compared to the total volume of air. Absolute humidity is usually expressed as grams per cubic meter g/m3 but it could also be expressed as grains per cubic foot.

 

Humidity Percentage

The ratio of the specific humidity of humid air to that of saturated air at the same temperature and pressure. Humidity is expressed as a percentage degree of saturation saturation ratio.

 

Humidity Relative

The ratio between the amount of water vapour present in air and the greatest amount the air could contain at the same temperature. Once the temperature changes so does the amount or ratio of water vapour which the air can retain. The ratio of the amount of water vapour present in the air compared to the maximum amount the air could retain at that specific temperature.

 

Humidity Specific

The total weight of water vapour present compared to the total weight of the air in the system. The weight of the water vapour in air associated with 1 pound weight of dry air.

 

HVAC

An abbreviation meaning the heating ventilation and air conditioning unit or system. A system which is concerned with the temperature humidity cleanliness and distribution of air throughout a building or conditioned space.

 

Hydrdynamic

Forces imposed on buildings by water moving around it. Among these loads are positive-frontal pressure against the structure drag effect along the sides and negative pressure on the downward or downstream side.

 

Hydrogen Peroxide

An effective skin antiseptic H2O2 at 3 percent strength. Strengths greater than 10 percent may be an effective disinfectant to contents and building materials. See Peroxygen

 

Hydrogen Sulfide

A rotten-egg fowl-smelling gas H2S produced during the anaerobic decomposition of organic material by bacteria and by the metabolism of sulphur-producing bacteria. The gasses are highly toxic to humans and when the smell is present appropriate breathing devices must be worn. Health and Safety Note Hydrogen sulphide is often found in the attached ground of substructural soil when it has been sewage contaminated with stagnant sewage sludge for some time. Old timers in the mining industry called this condition Stink Damp.

 

Hydrophilic

Having an affinity for water. Building materials which are moisture-loving and readily absorb moisture vapour and water such as drywall. See Hygroscopic

 

Hydrostatic

Moisture and vapour pressure exerted from below grade up through concrete and other porous building materials.

 

Hydrostatic Loads

Forces imposed on a surface such as a wall or floor by a standing mass of water. The water pressure increases with the square of the water depth.

 

Hygrgraph

A hygrometer having an arrangement for recording the atmospheric humidity and sometimes temperature and dew point.

 

Hygrometer

A scientific instrument used to measure moisture as water vapour in air. Some hygrometers are capable of measuring humidity temperature and dew point.

 

Hygroscopic

Materials easily absorptive of moisture readily absorbing and retaining moisture.

 

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%u0025 for periods of time. Restorative Drying Note 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. 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

 

Hygrothermograph

An instrument capable of measuring and charting temperature and humidity on the same chart. A simultaneous time recording of ambient temperature and humidity. Often hygrothermograph recorders print temperature in red while printing humidity in blue.

 

Hypersensitivity

A reaction or an altered state or activity in an individual following contact with certain kinds of inanimate or animate substances.

 

Hypersensitivity Diseases

A group of diseases that are associated with hypersensitivity pneumonitis and humidifier fever that involve inflammation of the lungs. Hypersensitivity diseases are usually thought to be caused by repeat exposures resulting in allergic reactions and health responses to a contaminate.

 

Hypersensitivity Pneumonitis HP

An indoor inflammatory disease from the inhalation of dusts spores and airborne contaminates. HP occurs less often than allergic rhinitis and asthma but when diagnosed it is often a more severe of a allergic reaction and it is harder to control. Health and Safety Note Water damage contractors have a due diligent responsibility to advise building occupants that if they have allergies it may be harmful for them to be in the effected zone or building during the containment drydown and dehumidification period.

 

Hypersensitivity Pneumonitis Immediate Type

An immune response by antibodies characterized by hives wheezing and/or abrupt chance in blood pressure. The response condition may be immediate or right after a few hours of an exposure. Health and Safety Note Hypersensitivity pneumonitis has been identified as an emergency health condition in some people which can be triggered from fungi dust and other contaminates in wet buildings. See Occupational Related Respiratory Diseases

 

Hyphae

The root-like structure which grows in the host material of damaged building materials which eventually becomes a fungi plant. In large numbers they are referred to as Mycelial Fragments. See Mycelial Fragments

 

Hypothesis Theory

An informed theory which best describes the best available information about why buildings and their occupants are having problems. Hypothesis modeling comes by visual and sometimes scientific investigation attempting to prove the hypothesis and to validate the theory. See Best Professional Judgement Extrapolation

 

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