IICRC - Applied Structural Drying questions and answers

Air Filtration Device (ADF) Commonly called an air scrubber or negative air machine if airborne particles need to be reduced, you could use an appropriately installed _______ ________ ________ Air Filtration Device AFD Assembly Construction Prior to determining the best drying system for affected materials, restorers should identify and understand the assembly construction (ie wall assembly, floor assembly) Category 1 water originates from a sanitary source and does not pose substantial risk for dermal, ingestion, inhalation, or exposure. Uncontaminated and routinely cleaned Category 2 water contains significant contamination and has the potential to cause discomfort or sickness if contacted or consumed by humans Category 3 water is grossly contaminated and can contain pathogenic, toxigenic, or other harmful agents Sewage Back Up Category 3 Clean water supply line Category 1 Class 1 Least amount of water absorption and evaporation load - Wet porous materials - water loss is less then 5% of the area Class 2 Significant amount of water absorption and evaporation load - water intrusion where wet represents 5% - 40% of the area. Class 3 greatest amount of water absorption and evaporation load. Water intrusion where wet represents over 40% of the area Class 4 deeply held or bound water. Significant amount of water absorption into low evaporation materials. Drying may require special drying methods, longer drying time, or substantial water vapor pressure differentials. Closed drying system Uses mechanical dehumidification and is not open to outside air. Used if there are security issues, the outside air is not conductive to drying or when access to outside air is not possible. Conventual refrigerant dehumidifier Removes water vapor from the air by lowering the temperature of the incoming air to below dew point and causing the water to condense on the coils. Cold and hot surfaces created with gases inside a closed coil system. Combination Drying System uses some outdoor air with dehumidifiers to accelerate the drying process. This can include periodically venting (flushing) the structure, using negative pressure or using small openings to the outside Desiccant dehumidifier Removes water vapor from the air through absorption. Usually requires more amperage as compared to refrigerant dehumidifier. Desiccants create the lowest vapor pressure which work best on low porosity materials. When a desiccant dehu is drawing outside air and ducting processed air inside a building it can create positive pressure in the building. To improve desiccant dehu performance, it may be beneficial to pre-cool the desiccants air intake Infiltration High humidity outside air could affect the drying climate adversely due to ______________ 1. Tightness of the building envelope 2. Prevailing weather 3. HVAC 4. Class of Water 5. Building Construction 5. Build out density Favors that affect the detailed dehumidifier calculation is: Detailed Dehumidification Calculation See Chart: Cubic Feet : Divided by 70 = Base Pints per day Multiply the 5 multipliers together: Build out density x building construction x class of water x HVAC x Weather Impact = Multiplier Multiply Base Pints per day x Multiplier = Adjusted Pints Per Day Dry Standards The unaffected material readings are called ______ ______. You know you can use this as your drying goal. Your drying goal is this plus 10% of it. Drying Goal Calculation Dry standard + (Dry standard x 10%) = ____________________ Why does demolition occur 1. Removing Materials to eliminate safety hazards 2. Removing materials that have suffered primary damage and are not restorable 3. Removing porous materials that are holding odor 5. Removing vapor barriers to assist with drying efforts 6. Removing materials to reduce drying time 7. Removing materials to open cavities or areas to provide additional needed services Useful for adjuster, or notes on xactimate line items Recommendation Calculation Step 1: Install One air mover in each affected Room Step 2: Add one air mover for every 50-70 square feet of affected wet floor in each room Step 3. Add one air mover for every 100 - 150 square feet of affected wet ceiling and wall areas above approximately 24" Step 4: Add one air mover for each wall inset and offset greater than 18" Step 5: Total x - y This is the __________ ___________ Recommendation Calculation Refrigerants Dehumidification Recommendation Calculation Cubic Footage / Chart Factor (use IICRC chart) = Total PPD (pints per day) Number of Dehu Calculation Total PPD (pints per day) removal recommendation / dehumidifier AHAM rating = _____ of ______ Calculation Cubic Feet Per Minute Calculation Cubic Footage x Chart Factor (ACH) / 60 minutes = Total ______ ______ _____ _______ calculation Total Number of Desiccant Dehumidifier Calculation Total CFM / Desiccant CFM Rating = Total ________of _________ ____________ Calculation Drying goals may be at or above the dry standard should be documented as they relate to specific materials. The restorer should establish drying goals that would be expected to Return structure, systems or contents to an acceptable condition and inhibit microbial growth. Along with the above considerations where applicable, it is recommended the drying goal be within 10% of the dry standards. Establishing Drying Goals ___________ _____________ ______________ normally starts by measuring similar materials in an unaffected area of the building. These unaffected material readings are called a dry standard. A. 45°F - best answer is always the lowest option If drying a crawlspace and the surface temperature of the wood framing is 80°F what is the dew point temperature of the crawlspace air that would provide the greatest potential for evaporations A. 45°F B. 65°F C. 85°F D. 105°F Dew Point A method to determine the effectiveness of the drying conditions is to measure the difference between the surface temperature of the materials and the ____________ ____________ of the air Temperature To decrease drying time of wet materials, restorers can increase the __________ of moisture in the materials. This accelerates the water molecules to make them move to the air. Tuesday The day with the greatest vapor pressure differential between air and material was Monday - Surface Vapor Pressure: .90 Air Vapor Pressure: .73 = Monday Vapor Pressure Differential: .17 Tuesday- Surface Vapor Pressure: 1.51 Air Vapor Pressure: .55 = Tuesday Vapor Pressure Differential: .96 Wednesday- Surface Vapor Pressure: 1.04 Air Vapor Pressure: .31 = Wednesday Vapor Pressure Differential: .73 Coldest Dew Point In the driest environments, we'll find _______? High Temperatures The IICRC S500 Water Damage Restoration Standard mentions the following concerns: ______________ ___________ may have weakending or destructive effects on the structural integrity or physical makeup of building materials and contents. Restores should be aware of any instructions or safety recommendations from manufactures of heating devices to protect occupant safety and avoid fire hazards