[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-459066-105":59,"doc-detail-459066-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","study-guide-water-damage-restorationapplied-structural-drying-wrtasd","Study Guide - Water Damage Restoration/Applied Structural Drying (WRT/ASD)","","Study guide supporting WRT/ASD courses, designed to prepare learners with key terminology, formulas, and foundational concepts before lectures and hands-on practice. Covers water categories and classes by contamination level and estimated evaporation/quantity, then details drying principles and the selection of extraction, evaporation, and dehumidification equipment. Includes psychrometric and calculation guidance, AHAM-based dehumidifier context, electrical/heat/energy definitions with BTU and power formulas, inspection tools, moisture testing, and antimicrobial/blocker considerations, plus carpet installation and construction basics.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/study-guide-water-damage-restorationapplied-structural-drying-wrtasd/459066/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/study-guide-water-damage-restorationapplied-structural-drying-wrtasd/459066.png","ImageObject",300,407,{"name":92,"@type":93},"วิน","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-08","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":29},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"How are water categories defined in WRT/ASD?","Question",{"text":112,"@type":113},"Category 1 comes from sanitary water sources, Category 2 is contaminated and may cause discomfort or sickness, and Category 3 is grossly contaminated and includes toxins and pathogens. Special situations cover regulated or hazardous materials.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What distinguishes water classes (Class 1 to Class 4)?",{"text":117,"@type":113},"Classes are based on quantity, anticipated absorption/evaporation behavior, and evaporation rate. Class 1 is the least amount of water (\u003C5%), Class 2 is 5%–40%, Class 3 is over 40%, and Class 4 is specialty drying involving deep pocket saturation materials.",{"name":119,"@type":110,"acceptedAnswer":120},"What tools and measurements are used to inspect moisture and drying conditions?",{"text":121,"@type":113},"Moisture sensors detect moisture over 17% MC and help map perimeter damage but cannot identify which layer is wet or when it is fully dry. Thermo-hygrometers determine temperature and relative humidity for inspection areas and support decisions about open/closed drying systems. Moisture meters (invasive and non-invasive) measure moisture content to establish and monitor when dry standards are met.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},459066,1790912509,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":29,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":34,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144},2336475104736,"https://ap-avatar.wpscdn.com/avatar/22000c4c5e0e5b17e70?x-image-process=image/resize,m_fixed,w_180,h_180&k=1786591360781797222","Study Guide-Water Damage Restoration/Applied Structural Drying (WRT/ASD)  \nThis study guide is provided to you to complement the lecture and hands-on learning environment of the WRT/ASD courses. Please use this guide to become familiar prior to class with terms, formulasand basic information. When combining this pre-course study guide with classroom instruction and homework assignments, your exam should be easier with higher retention.  \nCategory of Water: (source of the water)  \n• Category 1 (previously known as “clean”)– originates from a sanitary water source  \n• Category 2 (previously known as “gray”)– contaminated; may cause discomfort or sickness  \n• Category 3 (previously known as “black”)– grossly contaminated; includes toxins, pathogens  \n• Special Situations – regulated or hazards materials (IEP recommended in most situations)  \nClass of Water: (quantity; anticipated evaporation rate; initial dehumidifier calculations)  \n• Class 1 – least amount of water, absorption and evaporation; less than 5%  \n• Class 2 – large amount of water; absorption and evaporation (carpet; cushion; base of walls) 5%– 40%  \n• Class 3 – greatest amount of water; absorption and evaporation (ceiling; walls; insulation; flooring) over 40%  \n• Class 4 – specialty drying –(hardwood; plaster; concrete)– deep pockets of saturation  \nPrinciples of Drying: Remove excess / evaporation / dehumidification (ventilation) temperature control  \nExtraction tools:  \n• Light wand – perimeter of water loss; extract glue-down carpets; follow-up extractionstationary tool  \n• Stationary tool (e.g., Water claw; Flash Xtractor)–subsurface tool; extract carpet and cushion  \n• Self-propelled tools (e.g., Rover, Xtreme Xtractor)-self-propelled riding tool; multi-speed; extract carpet and cushion  \n• Vacuum squeegee-concrete; hardwood; vinyl; laminate  \n• Submersion pumps-Formula- (ft²x inches deep) ÷ 12” = ft³water x 7.48 = water volume  \nEvaporation tools:  \n• Airmovers – centrifugal (laminar); axial (high-amperage; low amperage; focus ability)ο placement – 5 – 45 degree focus; almost touching wall  \nο safety screens – intake and output areas; clean with compressed air; do not block intake  \nο electrical safety – lightweight extension cords; three-prong plugs; maintain electrical cord safety  \n• Structural Cavity Drying Systems (SCDS)  \nο vented (e.g., Turbovents 18” – 48” widths; Octi-dry; Air Wolf)  \nο injected (e.g., Injectidry; Dri-Force; Omni-dry; Direct-it In)  \n• Floor Drying Systems  \nο vented (e.g., Air Wolf)  \nο injected – negative air mats/panels (e.g., Dri-Force; Injectidry)  \nDehumidification equipment: AHAM rating-pints removed at 80° F/ 60% RH in 24 hours  \nType  Reduced Performance  \n\n| Type Dehumidifier | Temperature | Relative Humidity | Humidity Ratio (gpp) |\n| --- | --- | --- | --- |\n| Standard refrigerant | 68° F. | 60% | 55-60 |\n| Conventional | 33° F. | 40% | 55-60 |\n| Low Grain Refrigerant | 40° F. | 30% | 32-35 |\n| Desiccant (with silica gel) | 32° F. | 10% -below | 10 – 15-below |\n\n• Refrigerants – Most efficient operating conditions 70° -90° F. (LGR, most energy efficient)  \n• Desiccants-most efficient with incoming air from coolest/driest air possible; capable of creating differentials; produces low humidity ratio (gpp) advised to dry Class 4 materials  \n• Uses-closed-drying environments; multiple layers of materials; security limitations; high outside (and inside) humidity conditions; no ventilation ports; basement areas  \nInitial dehumidification calculations (psychrometric readings dictate requirements after first day)  \n\n| Type | Class 1 | Class 2 | Class 3 | Class 4 |\n| --- | --- | --- | --- | --- |\n| Conventional | 100 | 40 | 30 | N/A |\n| LGR | 100 | 50 | 40 | 40 |\n| Desiccant | 1 ACH\u003Cbr>(÷ 60) | 2 ACH\u003Cbr>(÷ 30) | 3 ACH\u003Cbr>(÷ 20) | 3 ACH\u003Cbr>(÷ 20) |\n\nElectrical / Heat / Energy:  \n• Amperes (amperage or “amps”)–the amount of electricity (current) flowing in a circuit  \n• Voltage-the force of electricity flow in a circuit  \n• Watts-the ","cbCaiaYALr6PG7UZ","https://ap.wps.com/l/cbCaiaYALr6PG7UZ","pdf",709350,"English","# Water Categories\n## Category 1, 2, 3 and Special Situations\n# Water Classes\n## Class 1-4 and specialty drying\n# Principles of Drying\n## Extraction, evaporation, and dehumidification\n# Drying Equipment\n## Extraction tools; evaporation tools; dehumidification equipment\n# Dehumidification and Psychrometric Calculations\n## AHAM rating and initial calculations\n# Equipment Performance Table\n## Types of dehumidifiers by temperature and humidity\n# Electrical, Heat, and Energy\n## Amps, volts, watts, BTUs, and power consumption formulas\n# Inspection Equipment\n## Moisture sensors, thermo-hygrometers, moisture meters, and misc tools\n# Chemicals and Blockers\n## Biocides and application documentation\n# Floorcovering and Carpet\n## Installation and drying methods; construction and delamination","[{\"question\":\"How are water categories defined in WRT/ASD?\",\"answer\":\"Category 1 comes from sanitary water sources, Category 2 is contaminated and may cause discomfort or sickness, and Category 3 is grossly contaminated and includes toxins and pathogens. Special situations cover regulated or hazardous materials.\"},{\"question\":\"What distinguishes water classes (Class 1 to Class 4)?\",\"answer\":\"Classes are based on quantity, anticipated absorption/evaporation behavior, and evaporation rate. Class 1 is the least amount of water (\\u003c5%), Class 2 is 5%–40%, Class 3 is over 40%, and Class 4 is specialty drying involving deep pocket saturation materials.\"},{\"question\":\"What tools and measurements are used to inspect moisture and drying conditions?\",\"answer\":\"Moisture sensors detect moisture over 17% MC and help map perimeter damage but cannot identify which layer is wet or when it is fully dry. Thermo-hygrometers determine temperature and relative humidity for inspection areas and support decisions about open/closed drying systems. Moisture meters (invasive and non-invasive) measure moisture content to establish and monitor when dry standards are met.\"}]","Study Guide - Water Damage Restoration/Applied Structural Drying (WRT/ASD) | PDF",1790755124,18]