{"id":610,"date":"2025-04-24T20:02:11","date_gmt":"2025-04-25T02:32:11","guid":{"rendered":"https:\/\/arizonaroofer.net\/wpaz\/?page_id=610"},"modified":"2026-03-18T13:58:01","modified_gmt":"2026-03-18T20:28:01","slug":"built-up-roofing-systems-bur-roofs-in-arizona","status":"publish","type":"page","link":"https:\/\/arizonaroofer.net\/wpaz\/built-up-roofing-systems-bur-roofs-in-arizona\/","title":{"rendered":"Built-Up Roofing (BUR)"},"content":{"rendered":"<style>.kb-row-layout-id610_115e58-18 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id610_115e58-18 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id610_115e58-18 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:var(--global-kb-spacing-lg, 3rem);padding-right:var(--global-kb-spacing-md, 2rem);padding-bottom:var(--global-kb-spacing-lg, 3rem);padding-left:var(--global-kb-spacing-md, 2rem);grid-template-columns:minmax(0, 1fr);}.kb-row-layout-id610_115e58-18 > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id610_115e58-18 > .kt-row-column-wrap{padding-top:var(--global-kb-spacing-md, 2rem);padding-right:var(--global-kb-spacing-md, 2rem);padding-bottom:var(--global-kb-spacing-lg, 3rem);padding-left:var(--global-kb-spacing-md, 2rem);grid-template-columns:minmax(0, 1fr);}}@media all and (max-width: 767px){.kb-row-layout-id610_115e58-18 > .kt-row-column-wrap{padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-right:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-md, 2rem);padding-left:var(--global-kb-spacing-sm, 1.5rem);grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id610_115e58-18 alignnone wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-1-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column610_dc31de-7c > .kt-inside-inner-col,.kadence-column610_dc31de-7c > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column610_dc31de-7c > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column610_dc31de-7c > .kt-inside-inner-col{flex-direction:column;}.kadence-column610_dc31de-7c > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column610_dc31de-7c > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column610_dc31de-7c{position:relative;}@media all and (max-width: 1024px){.kadence-column610_dc31de-7c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column610_dc31de-7c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column610_dc31de-7c\"><div class=\"kt-inside-inner-col\">\n<h1 class=\"wp-block-heading\" id=\"h-built-up-roofing-bur\">Built-Up Roofing (BUR)<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-history-and-evolution-of-built-up-roofing-bur-from-tar-and-gravel-to-today-s-modern-multi-ply-systems\"><strong>The History and Evolution of Built-Up Roofing (BUR): From Tar and Gravel to Today\u2019s Modern Multi-Ply Systems.<\/strong><\/h2>\n\n\n\n<p>When it comes to proven performance, few roofing systems can match the legacy of&nbsp;<strong>Built-Up Roofing (BUR)<\/strong>. With origins that trace back over 100 years, BUR has remained a reliable flat roofing solution for commercial buildings across the country\u2014including right here in Arizona\u2019s sunbaked climate.<\/p>\n\n\n\n<p>This article walks you through the&nbsp;<strong>complete history of BUR<\/strong>, how it works, and why it\u2019s still relevant in today\u2019s roofing industry.<\/p>\n\n\n\n<p>Built-up roofing is one of the oldest <a href=\"\/wpaz\/single-ply-roofing\/\">flat roofing systems<\/a> still in use today, and it\u2019s often considered alongside other flat roof options depending on durability and redundancy needs.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-origins-of-built-up-roofing\">The Origins of Built-Up Roofing<\/h2>\n\n\n\n<p>Built-up roofing can be traced back to the&nbsp;<strong>mid-1800s<\/strong>, when early forms of \u201ctar and paper\u201d roofs were developed in response to the need for durable waterproofing on flat and low-slope buildings.<\/p>\n\n\n\n<p>Back then, BUR consisted of alternating layers of&nbsp;<strong>coal tar pitch and felt<\/strong>, applied in multiple plies and topped with gravel or slag for protection. These early systems were labor-intensive and messy\u2014but they worked. The combination of layers created redundancy and waterproofing that outperformed other flat-roof methods of the time.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-growth-of-bur-through-the-20th-century\">Growth of BUR Through the 20th Century<\/h2>\n\n\n\n<p>As construction technology improved throughout the&nbsp;<strong>20th century<\/strong>, so did BUR systems. By the&nbsp;<strong>1920s\u20131950s<\/strong>, coal tar was gradually replaced by&nbsp;<strong>asphalt-based bitumen<\/strong>, which was easier to work with and safer to install.<\/p>\n\n\n\n<p>Key improvements included:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Higher-quality felts<\/strong>&nbsp;made from fiberglass or organic mats<\/li>\n\n\n\n<li><strong>Hot-mop asphalt kettles<\/strong>&nbsp;that made application faster and more uniform<\/li>\n\n\n\n<li><strong>Gravel surfacing<\/strong>&nbsp;that helped reflect UV rays and protect against foot traffic<\/li>\n\n\n\n<li><strong>Cold-applied systems<\/strong>&nbsp;that reduced fumes and fire risk<\/li>\n<\/ul>\n\n\n\n<p>By the&nbsp;<strong>1970s<\/strong>, BUR was the dominant flat roofing system across commercial real estate\u2014from warehouses and hospitals to schools and office buildings.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-a-built-up-roof\">What Is a Built-Up Roof?<\/h2>\n\n\n\n<p>A Built-Up Roof is a&nbsp;<strong>multi-layered system<\/strong>&nbsp;made of alternating plies of roofing felt (reinforcement) and bitumen (asphalt or cold adhesive), finished with a protective top layer. This top surface might be:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gravel (commonly called a&nbsp;<strong>tar-and-gravel roof<\/strong>)<\/li>\n\n\n\n<li>Mineral-surfaced cap sheet<\/li>\n\n\n\n<li>Reflective coating<\/li>\n<\/ul>\n\n\n\n<p>The multiple plies work together to create a&nbsp;<strong>redundant waterproofing barrier<\/strong>, which is why BUR is often considered a \u201cfail-safe\u201d system\u2014if one layer fails, others continue to protect the building.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"540\" height=\"398\" src=\"https:\/\/arizonaroofer.net\/wpaz\/wp-content\/uploads\/2026\/01\/BUR-roofing-1030x759-1-540x398.png\" alt=\"\" class=\"wp-image-1006\" srcset=\"https:\/\/arizonaroofer.net\/wpaz\/wp-content\/uploads\/2026\/01\/BUR-roofing-1030x759-1-540x398.png 540w, https:\/\/arizonaroofer.net\/wpaz\/wp-content\/uploads\/2026\/01\/BUR-roofing-1030x759-1-300x221.png 300w, https:\/\/arizonaroofer.net\/wpaz\/wp-content\/uploads\/2026\/01\/BUR-roofing-1030x759-1-768x566.png 768w, https:\/\/arizonaroofer.net\/wpaz\/wp-content\/uploads\/2026\/01\/BUR-roofing-1030x759-1.png 1030w\" sizes=\"auto, (max-width: 540px) 100vw, 540px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-common-problems-with-built-up-roofing-bur\">Common Problems With Built-Up Roofing (BUR)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Blistering caused by trapped moisture between plies<\/li>\n\n\n\n<li>Alligatoring and surface cracking as systems age<\/li>\n\n\n\n<li>Long-term ponding water due to inadequate drainage<\/li>\n\n\n\n<li>Aging felts losing flexibility over time<\/li>\n<\/ul>\n\n\n\n<p>While built-up roofing is known for redundancy and long-term durability, most failures are related to age, moisture trapped between layers, or chronic ponding water rather than normal foot traffic. Proper drainage, periodic inspections, and timely repairs play a much larger role in BUR performance than surface wear alone.<\/p>\n\n\n\n<p>Buckling in built-up roofing systems is often caused by thermal movement and trapped stresses, similar to the conditions that lead to <a href=\"\/wpaz\/how-to-repair-buckles-on-an-asphalt-roof\/\">roof buckling in asphalt systems.<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-modern-bur-roof-systems-still-standing-strong\">Modern BUR Roof Systems: Still Standing Strong<\/h2>\n\n\n\n<p>Although newer technologies like single-ply membranes and spray foam roofs have gained popularity,&nbsp;<strong>modern BUR systems remain widely used<\/strong>\u2014especially in buildings requiring high durability and proven performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What Makes Today\u2019s BUR Systems Better?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Advanced Reinforcements<\/strong><br>Today\u2019s plies use fiberglass mats or polyester scrims for improved strength and dimensional stability.<\/li>\n\n\n\n<li><strong>Modified Asphalt Options<\/strong><br>Many BUR systems now include&nbsp;<strong>polymer-modified bitumen (like SBS or APP)<\/strong>&nbsp;for added flexibility, UV resistance, and durability.<\/li>\n\n\n\n<li><strong>Cool Roof Surfacing<\/strong><br>Modern BURs can be finished with white or reflective coatings to comply with&nbsp;<strong>Title 24<\/strong>,&nbsp;<strong>LEED<\/strong>, or&nbsp;<strong>Energy Star<\/strong>&nbsp;requirements.<\/li>\n\n\n\n<li><strong>Cold-Applied BUR<\/strong><br>Eliminates the need for hot asphalt and open flames, improving jobsite safety and reducing odor\u2014ideal for sensitive locations like schools and medical centers.<\/li>\n<\/ol>\n\n\n\n<p>In some cases, building owners compare built-up roofing with <a href=\"\/wpaz\/polyurethane-foam-roofs\/\">spray foam systems<\/a> when prioritizing redundancy, insulation value, and long-term maintenance strategy.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-bur-roof-installation-how-it-works\">BUR Roof Installation: How It Works<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Base Sheet<\/strong>&nbsp;\u2013 Mechanically fastened or adhered to the roof deck<\/li>\n\n\n\n<li><strong>Multiple Ply Sheets<\/strong>&nbsp;\u2013 Typically 3\u20135 layers of asphalt-saturated felt or fiberglass, applied with hot asphalt or cold adhesive<\/li>\n\n\n\n<li><strong>Flood Coat<\/strong>&nbsp;\u2013 Final layer of asphalt applied across the entire surface<\/li>\n\n\n\n<li><strong>Surfacing Layer<\/strong>&nbsp;\u2013 Gravel, mineral cap sheet, or reflective coating to protect the system from UV, fire, and traffic<\/li>\n<\/ol>\n\n\n\n<p>BUR systems can range from&nbsp;<strong>3-ply to 5-ply or more<\/strong>, depending on building needs and warranty specifications.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-why-built-up-roofing-is-still-a-great-fit-for-arizona\">Why Built-Up Roofing Is Still a Great Fit for Arizona<\/h2>\n\n\n\n<p>In a climate like Arizona\u2019s\u2014with intense sunlight, monsoon rains, and high temperature swings\u2014BUR has several advantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Superior&nbsp;<strong>UV protection<\/strong>&nbsp;(especially with gravel or cool roof surfacing)<\/li>\n\n\n\n<li>Excellent resistance to&nbsp;<strong>thermal shock<\/strong><\/li>\n\n\n\n<li>Time-tested in high-heat and flat-roof environments<\/li>\n\n\n\n<li>Ideal for large&nbsp;<strong>commercial and industrial roofs<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-common-applications-of-bur-roofing\">Common Applications of BUR Roofing<\/h2>\n\n\n\n<p>BUR is a go-to system for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Office complexes<\/li>\n\n\n\n<li>Shopping centers<\/li>\n\n\n\n<li>Public institutions (schools, universities)<\/li>\n\n\n\n<li>Hospitals and medical buildings<\/li>\n\n\n\n<li>Industrial and warehouse facilities<\/li>\n<\/ul>\n\n\n\n<p>Its redundancy and durability make it a smart investment for&nbsp;<strong>mission-critical buildings<\/strong>&nbsp;that need dependable, long-term waterproofing.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-maintenance-and-longevity\">Maintenance and Longevity<\/h2>\n\n\n\n<p>With proper maintenance, a BUR system can last&nbsp;<strong>20\u201330 years or more<\/strong>. Key maintenance practices include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Regular inspections for ponding water or surface damage<\/li>\n\n\n\n<li>Recoating or re-graveling as needed<\/li>\n\n\n\n<li>Prompt repair of blisters, splits, or membrane separations<\/li>\n<\/ul>\n\n\n\n<p>Because of the system\u2019s multi-layer design, minor issues often don\u2019t lead to leaks\u2014giving building owners more time to react.<\/p>\n\n\n\n<p>Because roof condition, drainage, and structural capacity all influence whether a built-up system is appropriate, a <a href=\"https:\/\/thunderbirdroofing.com\/roof-inspections\/\">professional roof inspection<\/a> is usually the best place to start.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-final-thoughts-built-up-roofing-isn-t-going-anywhere\">Final Thoughts: Built-Up Roofing Isn\u2019t Going Anywhere<\/h2>\n\n\n\n<p>BUR might be one of the oldest flat roofing systems, but its&nbsp;<strong>time-tested performance<\/strong>, adaptability, and strength make it as relevant today as ever. Whether you\u2019re covering a warehouse in Phoenix or retrofitting an older commercial property, a modern BUR roof can deliver the&nbsp;<strong>durability, protection, and value<\/strong>&nbsp;your building needs.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-text-align-left has-theme-palette-5-color has-text-color has-link-color wp-elements-ed49f6376fb0fef376ed3d5597af72c2\">Professional installation and inspection services in Arizona are available through&nbsp;<a href=\"http:\/\/https\/\/thunderbirdroofing.com\">Thunderbird Roofing Systems<\/a>.<\/p>\n<\/div><\/div>\n\n<\/div><\/div>\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Built-Up Roofing (BUR) The History and Evolution of Built-Up Roofing (BUR): From Tar and Gravel to Today\u2019s Modern Multi-Ply Systems. When it comes to proven performance, few roofing systems can match the legacy of&nbsp;Built-Up Roofing (BUR). With origins that trace back over 100 years, BUR has remained a reliable flat roofing solution for commercial buildings&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-610","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Built-Up Roofing Systems | BUR Roofs in Arizona | Thunderbird - Arizona Roofer<\/title>\n<meta name=\"description\" content=\"Discover the history and benefits of Built-Up Roofing (BUR) systems. 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