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It covers water category and classification by contamination level and evaporation quantity, then outlines principles of drying and common extraction and evaporation tools. The guide details dehumidifier types and performance limits using temperature, RH, and humidity ratio ranges, plus electrical and energy concepts. It also explains inspection equipment, HEPA filtration, and biocide fundamentals to support safer, more effective restoration.",{"@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-applied-structural-drying-and-water-damage-restoration/459065/",{"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-applied-structural-drying-and-water-damage-restoration/459065.png","ImageObject",300,407,{"name":92,"@type":93},"นรินทร์","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-27","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":24},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"How do water categories differ in contamination risk?","Question",{"text":112,"@type":113},"Category 1 originates from a sanitary water source, Category 2 is contaminated and may cause discomfort or sickness, and Category 3 is grossly contaminated with toxins and pathogens. Special situations involve regulated or hazardous materials.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What are the key classes of water and how do they relate to drying?",{"text":117,"@type":113},"Water class reflects quantity and anticipated evaporation rate. Class 1 has the least water, Class 2 involves larger amounts (e.g., carpet, cushion, wall base), and Class 3 includes the greatest amounts (e.g., ceiling, walls, insulation, flooring). Class 4 is specialty drying for dense materials and deep saturation requiring controlled techniques.",{"name":119,"@type":110,"acceptedAnswer":120},"What tools and systems are used for extraction and evaporation during drying?",{"text":121,"@type":113},"Extraction commonly uses light wands, stationary tools, self-propelled tools, vacuum squeegees, and submersion pumps. Evaporation uses air movers (with placement and safety guidance) and structural cavity drying systems such as vented-ducted or injected systems, plus floor drying systems and air filtration devices like HEPA-equipped AFDs.","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},459065,1790912508,{"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":24,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":39,"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":46},2336475104957,"https://ap-avatar.wpscdn.com/avatar/22000c4c6bd8a5076e1?x-image-process=image/resize,m_fixed,w_180,h_180&k=1787554080175789136","Study Guide – Applied Structural Drying and Water Damage Restoration  \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: (the “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; potentially causes discomfort or sickness  \n• Category 3 (previously known as “black”)– grossly contaminated; includes toxins, pathogens  \n• Special Situations – regulated or hazardous 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  \n• Class 2-large amount of water, absorption and evaporation (carpet; cushion; base of walls)  \n• Class 3 – greatest amount of water, absorption and evaporation (ceiling; walls; insulation; flooring)  \n• Class 4 – specialty drying –(e.g., hardwood; lath and plaster; concrete)– deep pockets of saturation ;  \nrequires controlled drying techniques, low vapor pressure, specialty equipment probable Principles of Drying: Remove excess / Evaporation / Dehumidification (ventilation) / Temperature control Extraction tools:  \n• Light wand – perimeter of water loss; extract glue-down carpets; follow-up extraction-stationary tool  \n• Stationary tool (e.g., Water claw ; Flash Xtractor)– subsurface tool; extract carpet/cushion together  \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 –(ft2 x inches deep) ÷ 12” = ft3 water x 7.48 = water volume Evaporation tools:  \n• Airmovers – centrifugal (laminar); axial (high-amperage; low-amperage; focus ability)  \no placement – 1 for every 10-16 linear ft. of wall area; 5-45 degree focus; almost touching wall  \no safety screens – intake and output areas; clean with compressed air; do not block intake  \no electrical safety – lightweight extension cords; three-prong plugs; electrical cord safety  \n• Structural Cavity Drying Systems (SCDS)  \no Vented-ducted (e.g., Turbovents 18”-48” widths; Octi-dry; Air Wolf)  \no injected (e.g., Injectidry; Dri-Force; Omni-dry; Direct-it In)  \n• Floor Drying Systems  \no vented (e.g., Air Wolf)  \no injected – negative air mats/panels (e.g., Dri-Force; Injectidry)  \no air-blanket style  \n• Air Filtration Devices – AFDs (negative air machines-NAM; air scrubbers; HEPA filters)  \n2  \nDehumidifier Ranges: Understanding where temperature, RH, and GPP ratings are out of working ranges  \nType:   Reduced Performance if at or below:  \n\n| Type Dehumidifier | Relative Humidity | Humidity Ratio (gpp) |\n| --- | --- | --- |\n| Conventional | 40% | 55 |\n| Low Grain Refrigerant (LGR) | 30% | 34 |\n| Desiccant (with silica gel) | 10% -­‐ below | 10-­‐15 -­‐ below |\n\n• Refrigerants – Most efficient operating conditions 70º -90º F. (most energy efficient is an LGR)  \n• Desiccants – most efficient with incoming air from coolest/driest air possible; capable of creating greatest pressure differentials (air and vapor pressures); produces low humidity ratio (gpp) important to dry Class 4 materials, dense materials, and complex systems.  \n• Uses - closed-drying environments; multiple layers of materials; security limitations; high outside (and inside) humidity conditions; no ventilation ports; basement areas  \nInitial dehumidification recommendations (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","cbCailIWW3y9PWXJ","https://ap.wps.com/l/cbCailIWW3y9PWXJ","pdf",219860,"English","# Water Category and Classifications\n## Category of Water\n## Class of Water\n# Principles and Tools of Drying\n## Principles of Drying\n## Extraction tools\n## Evaporation tools\n## Air filtration devices (AFDs)\n# Dehumidification and Performance Limits\n## Dehumidifier ranges using temperature/RH/GPP\n## Initial dehumidification recommendations\n# Electrical, Heat, and Energy Basics\n## Electrical terms and conversions\n# Inspection Equipment and Hygiene Measures\n## Moisture and atmospheric inspection tools\n## Chemicals/biocides and HEPA fundamentals","[{\"question\":\"How do water categories differ in contamination risk?\",\"answer\":\"Category 1 originates from a sanitary water source, Category 2 is contaminated and may cause discomfort or sickness, and Category 3 is grossly contaminated with toxins and pathogens. Special situations involve regulated or hazardous materials.\"},{\"question\":\"What are the key classes of water and how do they relate to drying?\",\"answer\":\"Water class reflects quantity and anticipated evaporation rate. Class 1 has the least water, Class 2 involves larger amounts (e.g., carpet, cushion, wall base), and Class 3 includes the greatest amounts (e.g., ceiling, walls, insulation, flooring). Class 4 is specialty drying for dense materials and deep saturation requiring controlled techniques.\"},{\"question\":\"What tools and systems are used for extraction and evaporation during drying?\",\"answer\":\"Extraction commonly uses light wands, stationary tools, self-propelled tools, vacuum squeegees, and submersion pumps. Evaporation uses air movers (with placement and safety guidance) and structural cavity drying systems such as vented-ducted or injected systems, plus floor drying systems and air filtration devices like HEPA-equipped AFDs.\"}]","Study Guide - Applied Structural Drying and Water Damage Restoration | PDF",1790755124]