--- title: What is Roof Underlayment? (Video) description: Ready for a roof replacement? If so, you need to know about all the materials that make up your roof. One of these crucial materials is your roof's underlayment. In this video, you're going to learn what roof underlayment is, what it's used for, the types of underlayment, and more. image: https://www.billraganroofing.com/hubfs/what-is-roof-underlayment-video.png --- [Skip to main content](https://www.billraganroofing.com/blog/roof-underlayment-types-synthetic-felt#maincontent) - Follow Us - [ Facebook ](https://www.facebook.com/billraganroofingnashville/) - [ LinkedIn ](https://www.linkedin.com/company/bill-ragan-roofing-company) [«  View All Posts](https://www.billraganroofing.com/blog) [Video](https://www.billraganroofing.com/blog/topic/video) | [Underlayment](https://www.billraganroofing.com/blog/topic/underlayment) | [Roof underlayment](https://www.billraganroofing.com/blog/topic/roof-underlayment) # What is Roof Underlayment? (Video) May 14th, 2026 | 2 min. read - Share This Article - [**](https://www.facebook.com/sharer/sharer.php?u=https://www.billraganroofing.com/blog/roof-underlayment-types-synthetic-felt) - [**](https://twitter.com/intent/tweet?text=What+is+Roof+Underlayment%3F+%28Video%29&url=https://www.billraganroofing.com/blog/roof-underlayment-types-synthetic-felt&via=) - [**](https://www.linkedin.com/shareArticle?url=https://www.billraganroofing.com/blog/roof-underlayment-types-synthetic-felt&title=What+is+Roof+Underlayment%3F+%28Video%29&summary=Ready+for+a+roof+replacement%3F+If+so%2C+you+need+to+know+about+all+the+materials+that+make+up+your+roof.+One+of+these+crucial+materials+is+your+roof%27s+underlayment.+In+this+video%2C+you%27re+going+to+learn+what+roof+underlayment+is%2C+what+it%27s+used+for%2C+the+types+of+underlayment%2C+and+more.+) - [**](mailto:?body=https://www.billraganroofing.com/blog/roof-underlayment-types-synthetic-felt) ![What is Roof Underlayment? (Video)](https://www.billraganroofing.com/hubfs/what-is-roof-underlayment-video.png) ![Bill Ragan](https://www.billraganroofing.com/hubfs/Bill%20on%20hiking%20trail.png "Bill Ragan") [Bill Ragan](https://www.billraganroofing.com/blog/author/bill-ragan) ** Print/Save as PDF ### What is Roof Underlayment (Video) Video watch time: 3 minutes 41 seconds 00:00 - Intro 00:44 - What is Underlayment? 01:14 - Why is Roof Underlayment necessary? 01:41 - What are the main types of roof underlayment? 02:09 - Synthetic Underlayment 02:27 - Ice & Water Shield 02:56 - Summary of Key Points 03:18 - Outro   ## What is roof underlayment? Underlayment is a felt (15 lb or 30 lb) or synthetic material installed over your decking to provide additional protection if water gets underneath the roofing materials. It's one of the most crucial components of a roof system.   In this video, you'll learn what roof underlayment it is, why it's necessary, the different types,, and more.  After watching this video, don't forget to check out the next video on the roofing components: [Drip Edge](https://www.billraganroofing.com/blog/what-roof-drip-edge-materials-types). [![New call-to-action](https://no-cache.hubspot.com/cta/default/3406853/54aa3963-da66-453d-b8b6-0bf1d6a40900.png)](https://cta-redirect.hubspot.com/cta/redirect/3406853/54aa3963-da66-453d-b8b6-0bf1d6a40900) #### Table Of Contents ## Related Articles [### What To Keep In Mind When Buying Natural Roof Materials November 8th, 2022|1 min read ](https://www.billraganroofing.com/blog/what-keep-in-mind-buying-natural-roof-materials) [### Luxury Asphalt Shingles Pros and Cons November 3rd, 2022|1 min read ](https://www.billraganroofing.com/blog/luxury-asphalt-shingles-pros-cons) [### How Long Do Asphalt Shingle Roofs Last? 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August 11th, 2022|1 min read ](https://www.billraganroofing.com/blog/how-property-cleaned-up-during-after-roof-replacement) ```json { "@context" : "https://schema.org", "@id" : "https://www.billraganroofing.com/#roofing-contractor", "@type" : "RoofingContractor", "address" : { "@type" : "PostalAddress", "addressCountry" : "US", "addressLocality" : "Nashville", "addressRegion" : "TN", "postalCode" : "37204", "streetAddress" : "2969 Armory Dr., Suite 300" }, "description" : "Award-winning Nashville roofing company specializing in residential roofing services, including roof replacements, roof damage claims, gutters, and more backed by a lifetime warranty.", "founder" : { "@type" : "Person", "name" : "Bill Ragan" }, "foundingDate" : "1990", "geo" : { "@type" : "GeoCoordinates", "latitude" : 36.1038435, "longitude" : -86.7535011 }, "logo" : { "@type" : "ImageObject", "url" : "https://www.billraganroofing.com/hs-fs/hubfs/assets/logo/bill-ragan-roofing-company--logo.jpg?width=200&height=83&name=bill-ragan-roofing-company--logo.jpg" }, "name" : "Bill Ragan Roofing Company", "priceRange" : "$, $$, $$$", "sameAs" : [ "https://www.facebook.com/billraganroofingnashville/", "https://www.instagram.com/billraganroofing/", "https://www.youtube.com/@theroofingchannel", "https://www.linkedin.com/company/bill-ragan-roofing-company", "https://www.yelp.com/biz/bill-ragan-roofing-nashville-2" ], "telephone" : "+1-615-242-0333", "url" : "https://www.billraganroofing.com/" } ``` ```json { "@context" : "https://schema.org", "@id" : "https://www.billraganroofing.com/#website", "@type" : "WebSite", "inLanguage" : "en", "name" : "Bill Ragan Roofing Company", "publisher" : { "@id" : "https://www.billraganroofing.com/#roofing-contractor" }, "url" : "https://www.billraganroofing.com/" } ``` ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "articleSection" : "Video", "author" : { "@type" : "Person", "name" : "Bill Ragan", "url" : "https://www.billraganroofing.com/blog/author/bill-ragan" }, "dateModified" : "2026-05-14T15:18:49+00:00", "datePublished" : "2026-05-14T15:17:10+00:00", "description" : "Ready for a roof replacement? 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