[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-669975-105":3,"detail-sidebar-cat-0-en-105":80,"doc-detail-669975-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":73,"head_meta":75,"extra_data":77,"updated_unix":79},105,"en","roof-slope-guide","Roof Slope Guide","","Roof Slope Guide explains how to select the optimum roofing profile when roof slope is a key design variable. It focuses on drainage performance, supported by regional rainfall intensity considerations and a 100-year ARI rainfall basis. The guide covers major slope factors including economy, safety, drainage, services, durability, aesthetics, and wind resistance, with practical methods for estimating effective flow areas and roof run length.",{"@graph":14,"@context":72},[15,34,55],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/technology/","Technology",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/roof-slope-guide/669975/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/roof-slope-guide/669975.png","ImageObject",300,407,{"name":42,"@type":43},"8796093062539","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-04","2026-11-01",true,{"@type":52,"interactionType":53,"userInteractionCount":30},"InteractionCounter",{"@type":54},"ViewAction",{"@type":56,"mainEntity":57},"FAQPage",[58,64,68],{"name":59,"@type":60,"acceptedAnswer":61},"What key factors are considered when choosing roof slopes?","Question",{"text":62,"@type":63},"The guide lists economy, safety, drainage, services, durability, aesthetics, and wind resistance as major factors for roof slope selection.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"What rainfall basis is used for roof slope and drainage capacities in the publication?",{"text":67,"@type":63},"All capacities are based on rainfall intensity of a 100 year ARI for a 5 minutes duration.",{"name":69,"@type":60,"acceptedAnswer":70},"Why does maintaining the minimum roof slope matter for durability?",{"text":71,"@type":63},"Minimum fall must be maintained across the whole roof to prevent ponding, which traps dirt and moisture and increases exposure-related degradation.","https://schema.org",{"og:url":32,"og:type":74,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":76,"canonical":32},"index,follow",{"doc_id":78,"site_id":7},669975,1793565452,{"code":4,"msg":81,"data":82},"success",[83,87,91,95,100,104,109,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":84,"show_sort_weight":85,"slug":86},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":88,"show_sort_weight":89,"slug":90},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":92,"show_sort_weight":93,"slug":94},"Exam",70,"exam",{"id":96,"doc_module":4,"doc_module_name":25,"category_name":97,"show_sort_weight":98,"slug":99},5,"Comic",60,"comic",{"id":101,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":102,"slug":103},6,50,"technology",{"id":105,"doc_module":4,"doc_module_name":25,"category_name":106,"show_sort_weight":107,"slug":108},7,"Healthcare",40,"healthcare",{"id":110,"doc_module":4,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},8,"Research & Report",30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":96,"slug":129},19,"General","general",{"code":4,"msg":81,"data":131},{"doc_id":78,"user_id":132,"nickname":42,"user_avatar":11,"doc_module":4,"category_id":101,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":133,"file_id":134,"file_url":135,"file_type":136,"file_size":137,"view_count":30,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":110,"language":138,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":139,"faqs":140,"seo_title":141,"seo_description":12,"update_tm":79,"read_time":117},8796093062539,"D E S I G  \nROOF SLOPE  \nN G U I D E  \nDG – RS  \nROOF SLOPE GUIDE  \nSelecting the optimum roofing profile for applications where roof slope is a key consideration. Incorporates detailed regional rainfall intensities.  \nImportant note  \nThe information contained within this brochure is intended for general use and information only. Before application in a particular situation, Stramit recommends that you obtain appropriate independent qualified expert advice confirming the suitability of product(s) and information in question for the application proposed. While Stramit accepts its legal obligations, be aware however that to the extent permitted by law, Stramit disclaims all liability (including liability for negligence) for all loss and damage resulting from the direct or indirect use, or reliance on, the information provided in this brochure.  \nRoof slope factors  \nThe major factors when considering roof slopes are  \n• Economy • Safety  \n• Drainage • Services  \n• Durability • Aesthetics  \n• Wind resistance  \nThis guide focuses particular attention on drainage and gives comprehensive information on the drainage characteristics of Stramit®’s range of roofing profiles. This, along with rainfall data for major locations, will enable easy selection of the best product for each application.  \nEconomy  \nRoof slope can have a significant effect on the cost of a building. The extent of this effect is dependent on building size and proportions. Generally the longer the roof slope and the lower the building height the greater the cost reduction from minimising roof slope. These savings are in the wall structure and wall cladding. It should be realised however that increasing the roof slope sufficiently could reduce wind pressures and lower the roof structure cost.  \nDrainage  \nDesign basis  \nAll roof slope/drainage capacities in this publication are based on rainfall intensity of a 100 year ARI (Average Recurrence Interval) of 5 minutes duration.  \nThe effective flow areas of roofing profiles are conservative. They are based on water being limited to the depth fully below each profile anti-capillary feature, and further reduced by a freeboard allowance. Recent tests at University of Technology, Sydney on several Stramit® profiles have confirmed the adequacy of the data.  \nRoof run length  \nThe roof run length is the combined length of roofing run contributing to water flow in anyone sheeting pan (or trough) at the lowest edge. If roof penetrations or spreaders are present it is likely that the maximum roof run length will exceed the distance from the ridge to the eaves.  \n(Note – if practical place roof penetrations towards the top of a roof slope where water flow is less significant.)  \nWater flow is complex. However a simplified method of estimating water flow is generally satisfactory. The illustration shows a typical roof arrangement where two penetrations influence the roof run length in various sheeting pans. Although the nominal roof length is 30m, the Maximum Roof Run Length is 44m in this case. This increase will be lower if water is re-directed back into the original pans below the penetrations.  \nridge  \n\n| 6\u003Cbr>16\u003Cbr>30 | 6 | 6 | |  | | | |  | 6\u003Cbr>16\u003Cbr>30 |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n|  |  |  | 6 |  |   6 | 6   |  | 6\u003Cbr>12 |  |\n|  |  |  | 12 |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  | 10\u003Cbr>24 | 10\u003Cbr>24 | 22\u003Cbr>36 |  |  |\n|  | 16\u003Cbr>24 | \u003Cbr>| 22\u003Cbr>30 |  |  |  |  |  |  |\n|  | 38 | 14 | 44 |  |  |  |  |  |  |\n\neave  \nCurved roofs  \nSpring-curved convex roofs can provide an excellent solution to roof drainage, particularly on large roofs. A convex curve approximates the increasing volume of water along the roof run and therefore can lead to efficient structures. Information on spring-curving of Stramit profiles can be found in the publication Spring Curving Guide.  \nVariable pitch roofs  \nOn very large roofs drainage can lead to increases in roof slope and consequ","cbCaiml0DfoKfOZ6","https://ap.wps.com/l/cbCaiml0DfoKfOZ6","pdf",5896415,"English","# Roof Slope Factors\n## Economy\n## Drainage\n### Design basis\n### Roof run length\n### Curved roofs\n### Variable pitch roofs\n## Durability\n### Minimum slope\n### The benefit of additional slope\n## Wind Resistance","[{\"question\":\"What key factors are considered when choosing roof slopes?\",\"answer\":\"The guide lists economy, safety, drainage, services, durability, aesthetics, and wind resistance as major factors for roof slope selection.\"},{\"question\":\"What rainfall basis is used for roof slope and drainage capacities in the publication?\",\"answer\":\"All capacities are based on rainfall intensity of a 100 year ARI for a 5 minutes duration.\"},{\"question\":\"Why does maintaining the minimum roof slope matter for durability?\",\"answer\":\"Minimum fall must be maintained across the whole roof to prevent ponding, which traps dirt and moisture and increases exposure-related degradation.\"}]","Roof Slope Guide | PDF"]