Download WRT Certification Exam Questions and Answers: Restorative Drying and Water Damage and more Exams Water and Wastewater Engineering in PDF only on Docsity!
WRT Cert
WRT Certification Exam
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The most critical course of action in restorative drying is to _______ ______ and begin __________ as soon as possible. - ANS respond quickly & mitigation All restorers should follow the standard of care for the water restoration profession developed by the restoration industry entitled the IICRC ____. - ANS S To help protect technicians from the many hazards associated with contaminated water losses, restorers need to have ready access to several items. These items protect for all _________ _________ to the body. - ANS potential exposures Respiratory protection regulations state that the employer must provide: - ANS 1. Medical evaluations
- Fit testing
- Training The contract clearly states the agreement between the building owner and the restoration contractor. The form specifies who is responsible for payment and should be signed ______ work begins. - ANS before
WRT Cert The technicians first responsibility when arriving at a water damage site is to identify, communicate, and eliminate ______ _______ if reasonably possible. - ANS safety hazards Federal regulations apply to the handling of ____ based paint and asbestos. - ANS lead After safety concerns have been addressed and the initial water source has been stopped, the restorer must complete an evaluation of the water's migration through the structure. During this process, the restorer inspects all ___________ ________ areas. - ANS potentially affected The ultimate goal is to find the "edge" of water migration, which moves in a three-dimensional path throughout the structure. This is accomplished across carpeted surfaces using a ________ ______, and across most hard surfaces using a ___-________ (non-penetrating) moisture meter. - ANS moisture sensor & non-invasive Water from a clean source with no substantial risk of causing sickness of discomfort is said to be ________ _ water. - ANS Category 1 Water that has a significant degree of chemical, biological, and/or physical contamination and a potential to cause sickness or discomfort is ________ _. - ANS Category 2 Cleaning procedures must be employed before the drying of a Category 2 water loss can continue. At a minimum, affected ______ ________ (or pad) must be removed and disposed of, and carpet must be
WRT Cert When carpet delamination (the loss of integrity in the adhesives used to laminate the _______ and _________ backings) has occurred, further damage is very likely. For this reason, when extensive carpet delamination is discovered, technicians must call it to the attention of all materially interested parties, document the condition and suggest ___________. - ANS primary, secondary, & replacement There are a number of causes for carpet delamination -- many of them related to ________ restoration activities. - ANS improper Typical causes of carpet delamination are: - ANS 1. Folding or stretching carpet when wet
- Overly aggressive extraction
- Improperly specified carpet underlay
- Improper installation
- Improper removal from tack strip
- Improper floating of carpet
- Excessive wear
- Pet damage Many building materials will absorb excess water vapor and suffer damage, especially when air is allowed to remain above __% relative humidity. - ANS 60 Hygroscopic materials gain and lose moisture continually in an effort to ________ with the water content in the surrounding air mass. The more hygroscopic the material, the faster it will collect water vapor,
WRT Cert and the easier it will suffer _________ damage. - ANS equalize & secondary When water intrusion results in water running through wall cavities, inspection access holes are used to ensure that blow-in insulation has not compacted and lost its _-_____. - ANS R-Value The most effective way to speed the drying process is to remove as much of the water in a liquid state as possible during the ___________ phase (for example, multiple extractions). Poor extraction will significantly slow the drying process. - ANS extraction Abide by local ____ and regulations when disposing extracted water. Waste water is best disposed of into a sanitary sewer. - ANS laws The primary goal of the initial extraction of the affected area is to contain further _________ of the water within the structure. - ANS migration Whenever carpet must be disengaged from the tackles strip, a ____ ______ and carpet awl must be used. - ANS knee kicker The majority of cushion has a skin or mesh on the top side. The purpose of this skin is to ease ______ __________ during installation; it is not a vapor barrier. - ANS carpet stretching If the carpet is to be re-installed, technicians should avoid cutting carpet seams unless it is absolutely _________. - ANS necessary
WRT Cert A thermo-hygrometer is used to monitor any air that can influence the ___________ and/or ________ ________ with a restorative drying environment.
- ANS temperature & relative humidity To evaluate the progress of structural drying projects, restorers should measure:
- moisture in __________ being dried (moisture content readings)
- ___ being used to dry affected materials (psychrometric readings)
- ___ produced by mechanical systems (dehumidifiers) - ANS materials, air, & air Evaporation will increase when: - ANS 1. Wet materials are made warmer.
- When drier air is used.
- When air is moved more rapidly across the wet surface. After excess water has been extracted, the time needed to dry wet materials is determined by the ____ __ ___________. - ANS rate of evaporation As the water is rapidly evaporated, the water vapor is removed by ________________ or ___________. - ANS dehumidification & ventilation ___________ occurs when liquid changes to a vapor. Occurs as energy is increased. - ANS Evaporation
WRT Cert As moisture evaporates from a wet material, the surface of the material becomes ______ because energy is released from the material.
- ANS cooler ____________ occurs when vapor changes to a liquid. Occurs as every is removed. - ANS Condensation ___________ occurs when a solid changes to a vapor (without going through a liquid phase.) - ANS Sublimation Freeze drying (sublimation) is typically used with valuable saturated books and documents. Books and documents saturated with clean water may be restorable if: ______ or _____ as quickly as possible. - ANS Frozen & dried ________ ________ is defined as the amount of moisture contained in an air sample, as compared to the maximum amount the air could hold at that temperature. - ANS Relative humidity (RH) When the air temperature increases, it can hold ____ water vapor. - ANS more In the restorative drying industry the weight measurement used to measure water vapor in air is grains per pound of air, abbreviated as GPP. This is called ________ _____. - ANS humidity ration Which of these surface temperatures would promote the most rapid evaporation?
WRT Cert If surfaces are ______ that the dew point of the surrounding air, water will condense on those surfaces and possibly cause secondary damage. If surfaces are ______ that the dew point of the surrounding air, evaporation can occur. - ANS cooler & warmer _____ ________ is the force exerted by a gas (vapor molecules) on the surrounding environment. - ANS Vapor pressure Vapor pressure, dew point, and humidity ration (GPP) are ________ _______ to each other. When one increases, the other two ________. When one decreases, the other two ________. - ANS directly related, increase, & decrease Water vapor pressure is the force that drives higher concentrations of humidity from one space to another in an attempt to seek ___________ with lower concentrations of water vapor. - ANS equilibrium The ability for water vapor to diffuse through a solid material is expressed as the materials _________. - ANS permeance 3 drying systems: - ANS 1. Open- intentionally using outdoor air
- Closed- using mechanical dehumidification only
- Combination- using outdoor air combined with mechanical dehumidification If open drying is determined appropriate, the following options are available to the restorer: - ANS 1. Using ventilation
- Opening windows
- Install fans to create pressure differentials and air exchanges
WRT Cert ___________ drying systems merge the benefits of both open and closed drying: the use of available, dry air from outside and the control offered by a closed system and mechanical dehumidification. - ANS Combination Elevating the temperature of a material will increase the _____ ________ associated with the moisture in the material. - ANS vapor pressure If the surface temperature of the material is higher than the ___ point temperature of the surrounding air, evaporation may occur. - ANS dew Which of these surface temperature would have the fastest rate of evaporation? A. 10 degrees below dew point B. 20 degrees above dew point C. 30 degrees above dew point - ANS C. 30 degrees above dew point (the higher the better) Class 1 water intrusions involve the _____ amount of water absorption, with less than _% of the area surfaces being wet porous materials. - ANS least & 5 Class 2 water intrusions involve a ___________ amount of water absorption, with more that _% but less than __% of area surfaces being wet porous materials. - ANS significant, 5, & 40
WRT Cert higher humidity conditions. Refrigerant dehumidifiers work best between __ degrees and __ degrees. - ANS condensation, 70, & 90 Conventional refrigerant dehumidifiers under normal temperatures are effective in reducing high humidity to a normal level - approximately 40% RH, or about __ GPP. - ANS 55 LGRs produce lower _____ _________ than conventional refrigerants and continue to remove significant water vapor down to __ GPP. - ANS vapor pressure & 34 Because desiccant dehumidifiers do not use condensation to remove water, they are not limited by low dew point temperatures; therefore, they produce the lowest _____ ________ of any dehumidifier. - ANS vapor pressure If a structure had affected air at 85 degrees at 65% RH, the most efficient type of dehumidifier to use would be a : Refrigerant or Desiccant - ANS Refrigerant If a structure had affected air at 75 degrees at 25% RH, the most efficient type of dehumidifier to use would be a : Refrigerant or Desiccant - ANS Desiccant If a structure cannot be warmed to a temperature where LGRs would be effective, the most efficient type of dehumidification to use would be:
WRT Cert Refrigerant or Desiccant - ANS Desiccant Air filtration devices (AFDs) are needed in water restoration work whenever high level of ____________ are being added to the air. - ANS particulates Cupping will generally be the first indication of abnormal moisture levels in hardwood flooring as the ______ and sides of the board absorb moisture. - ANS bottom Cupping in hardwood is not _________ damage, and should be dried in most cases. - ANS permanent _______ represents the "was-wood" material with the least engineering, and thus the most natural fibre bonding. It is _________ to swelling and delamination due to its wood veneer assemblies which are glued under extreme pressure. - ANS Plywood & resistant Wet particle board would normally be _______ and replaced - ANS removed Plastic Laminate Flooring is made of MDF and has a resin saturated appearance layer. Normally _______ in water restoration due to its construction and installation components. - ANS removed Remove the vinyl (flooring) and discard it if the ____________ is saturated and/or damaged; vinyl is a vapor barrier and the time required to dry
WRT Cert Inspections are more consistent when the overall goals are kept in mind: a. Determine how wet items are:
- Monitor _____ in most circumstances.
- Use the same ______ in the same locations each day. b. Determine if wet items are ______. c. Determine if ________ items are dry (done). - ANS daily, meters, drying, & affected Restorers will know the drying job is dry and done when moisture meters verify that the structure has reached the ______ _____. - ANS drying goals Moisture documentation of restoration work should include each of the following components: a. Record of ________ Content (RMC) b. Moisture Map - a diagram or sketch indication the boundaries and moisture level of the affected area c. Record of ______ Conditions (RDC), or Daily Humidity Record. - ANS Moisture & Drying Once it has been determined that the floor can be salvaged by in-place drying, the first step is to determine a ______ ____ for the hardwood and subfloor. - ANS drying goal The wood is considered dry when:
WRT Cert a. Hardwood and sub surfaces are within - percentage points of normal Equilibrium Moisture Content (Dry Standard). b. Sub surfaces below hardwood are dried to within - percentage points of the hardwood. c. After wood flooring has been dried to acceptable moisture content, appropriate ___________ time should be allowed before refinishing. - ANS 2 - 4, 2 - 4, & acclimation The best way to prevent odours and retard microbial growth in a wet structure is to ensure that all materials are dried _________ and _______. - ANS thoroughly & rapidly When the presence of mold is suspected, it is important to communicated with all parties and used appropriate __________ measures. - ANS protective As with any contaminant, mold should be removed or contained before any air movers are placed in the structure. Blowing air can spread mold spores from the ____________ area to the __________ rooms. - ANS contaminated & unaffected Dry rot (wood rot) can occur when wood is visibly dry yet wetter than __% moisture content. - ANS 20 Restorers must use a third party (IEP) in situations that involve severe public health issues, ____ ____ occupants living or working in the structure, or extensive _________ contamination that can affect worker or occupant health. - ANS high risk & microbial
