Homework Flashcards
The most critical course of action in restorative drying
Respond quickly
Respiratory protection regulations state that the employer must provide
- medical evaluation
- fit testing
- training
As a minimum medical requirement technicians need medical consultation with who?
Primary care physician
Technicians must have ready access to several items to protect themselves from many hazards associated with contaminated water losses. These items protect them from:
Potential exposures
The contract clearly states the agreement between building owner and the restorative contractor. The form specifies should is responsible for payment and should be signed when?
Before work begins
The technicians first responsibility when arriving at a water damage site is to identify, communicate and eliminate what?
Safety hazards
The most common safety hazards associated with water damaged structures result in:
Slips and falls
Federal regulations apply to the handling of ______ based paint and asbestos.
Lead
After safety concerns have been addressed and the initial water source has been stopped, the restorer must complete an evaluation of the waters migration through the structure. During this process, the restorer inspects which areas?
All potentially affected
The ultimate goal is to find the edge of water migration, which moves in a 3D path throughout the structure. This is accomplished across carpeted surfaces using what?
Moisture sensor
The ultimate goal is to find the edge of water migration, which moves in a 3D path throughout the structure. This is accomplished across most hard surfaces using what?
Non-invasive (non-penetrating) moisture meter
Water from a clean source with no substantial risk of causing sickness or discomfort?
Category 1
Water that has a significant degree of chemical, biological and/or physical contamination and potential to cause sickness or discomfort
Category 2
Disease causing
Pathogenic
Water intrusion results from a grossly unsanitary source or carries pathogenic agents
Category 3
First priority on every sewage loss
Worker and occupant health and safety
When resistance is encountered and performing proper services in a Category 3 water loss becomes a challenge, what should restorers do?
Stop work immediately and prevent liability
Losses where regulated or hazardous materials have contaminated the structure. Does the category of water change?
No
During the initial inspection, pre-existing conditions should be identified, documented and communicated to who?
All materially interested parties
The loss of integrity in the adhesives used to laminate the primary and secondary backing.
Carpet delamination
Hygroscopic materials gain and lose moisture continually in an effort to ____ with the water content in the surrounding air mass.
Equalize
The more hygroscopic the material, the faster it will collect water vapor, and the easier it will be to suffer what type of damage?
Secondary
When water intrusion results in water running through wall cavities, inspection access holes are used to ensure that blown in insulation has not compacted and lost its what?
R-Value
What surface temp would you h e condensation?
Look for the dew point
Best way to get water out of materials?
Extraction
Another name for drywall
Gypsum
Good easy way to lower humidity in a home
Open windows
Tools to lift carpet
Knee kicker and carpet all
Material that’s weaker when wet and stronger when dry
Drywall
Gain water
Absorb
Lose water
Desorb
Absorb and desorb water
Hygroscopic material
Best drying condition for temperate and RH?
Furthest separation.
Moisture below hardwood surface causes
Cupping
Moisture on surface of hardwood floor causes
Crowning
Best way to handle wet concrete
Dry it in place
Will likely never demo concrete
Gypsum wallboard
Drywall
Ambient air
Affected air
Has to be vented out of the building
Desiccant
Other names for Ai Filtration Devices
- air Scrubbers
- hepa
- negative air fan
Percentage of water in a Class 1 loss
Less than 5%
Percentage of water in a Class 2 loss
Between 5-40%
Percentage of water in a Class 3 loss
40% or more
Percentage of water in a Class 4 loss
All dense material affected
Any surface hotter than dew point
Evaporation
Any surface cooler than dew point
Condensation
Condensation tells you the
Dew point
The force by a gas on the surrounding environment
Vapor pressure
4 knows of drying
- What’s wet?
- How wet is it?
- Is it drying?
- Is it done?
S-500 requires readings where?
Outside
Affected area
Non-affected area
Dehumidifier output
(HVAC optional)
Primary water damage
Water directly caused it
Secondary water damage
Poor humidity or growth
Best place to dispose of extracted water
Sanitary sewer
Primary goal of the initial extraction of the affected are is to what?
Contain further migration of the water within the structure
Best tool to disengage a carpet from the tackles strips.
Knee kicker and carpet awl
The cushion on a carpet has a skin or mesh on the top side. The purpose is to ease carpet stretching. Is it a vapor barrier?
No.
3 levels of biocidal activity
Sanitizer
Disinfectant
Sterilizer
Best way to set a restorative drying goal is to?
Establish a drying standard
Drying standard is established by obtaining a moisture using what kind of material?
Unaffected
Most accurate moisture readings come from
Moisture meter
Non-invasive meters work best for locating abnormal moisture behind and beneath finishing materials such as?
Ceramic tile & vinyl floor coverings
Air being used to dry affected materials
Psychrometric readings
Air produced by mechanical systems
Dehumidifiers
What is used to monitor any air that can influence temperature and/or relative humidity?
Thermo-hygrometer
After physically removing excess water, the time required to dry wet materials is influenced mostly by
Rate of evaporation
As water is rapidly evaporated, the water vapor is removed by
Dehumidification or ventilation
As moisture evaporates from a wet material, the surface of the materials becomes
Cooler
Because energy is released from material
When a solid changes to a vapor
Sublimation
Sublimation is also referred to as
Freeze drying
Typically used with valuable saturated books and documents
When air temperature increases, it can hold more or less water vapor?
More
One of the most effective methods for drying wet wood under hard surfaces?
Heated airflow
Another term for heated airflow
Thermal energy
If air vapor pressure is low and the material vapor pressure is high, what happens?
Evaporation
Elevating the temperature of the material will increase what?
The vapor pressure
To maintain safety certified equipment, restorers must regularly replace?
Cords and inlet and outlet screens that are damaged
Dehumidification reduces what
Moisture content in the air
A balanced drying system is achieved when the rate of dehumidification is greater than or equal to what
Rate of evaporation
If the rate of evaporation is allowed to exceed the rate of dehumidification what could occur?
Secondary damage
AFDs are needed in water restoration work whenever high levels of what are bing added to the air?
- dust
- smoke or other particulates
- aerosolized soils
“Was-wood” material with the least engineering, and thus the most atrial fiber bonding. It is resilient to swelling and delamination due to its wood VENEER assemblies which are glued under extreme pressure
Plywood
We particle board would normally be
Removed and replaced
RMC
Record of moisture content
RDC
Record of drying conditions
Or
Daily Humidity Record
As mold grows, it can produce a toxic chemical substance. All mold related toxins are referred to as
Mycotoxins
Common safety measures to take when the presence of mold is suspected
Containment, hepa, PPE
How often to monitor jobs?
Daily
