This means two inches of vertical rise for every twelve inches of horizontal run (17% slope) per IBC code. Minimum Pitch/Slope of An Asphalt Shingle Roof Shingles of all types need to have a slope to function properly. roofing contractors workmanship warranty. But this extra life and aesthetics comes at a higher price and is more expensive than all 3 types of roof membranes. This isnt a big deal, but its just something to keep in mind when choosing your roofing material. Shingles require a specific pitch to work correctly. It might not be obvious to see the slope measurement. Keep in mind that neither metal shingles not corrugated metal panels are suitable options for low-slope or nearly flat roofs. (Note: In Florida, CertainTeed will waive the requirement of applying starter shingles along the roof rake if all of the following conditions are met: The applicable building code requires that asphalt roof shingles be embedded in an 8-inch-wide bed of asphalt roofing cement applied along the roof rake edges. 2004-2022 IKO Industries Ltd., IKO Industries, Inc., and their affiliated and related entities. That's because shingles are designed so that the slope allows water to shed off. What is the minimum pitch/slope for a metal roof? Install the shingles at roughly 9 degrees and use a slope to be precise. TPO (thermoplastic polyolefin)is a single-ply white membrane used in both commercial and residential roofing. Asphalt shingles shall have the minimum number of fasteners required by the manufacturer, but not less than four fasteners per strip shingle or two fasteners per individual shingle. To ensure complete satisfaction you should make final color selections from several full size shingles and view a sample of the product installed on a home. After that, well get to the minimum roof pitch for asphalt shingles and the reasons why you cant use them on a low slope pitch. NRCA 's recommended minimum roof slope guidelines . Under the ideal conditions, a standing seam metal flat roof could last for 50 years. A word of caution: if you have a roof that is just above the minimum pitch, you still may better off using a different product than shingles. roofing contractors workmanship warranty. When installing asphalt shingles, you. Even the installation process is pretty much the same. . And, the A standing seam metal roof is a great roofing material for a flat roof. Remember that a qualified roofer may be able to present you with a wide range of options if asphalt shingles are not appropriate. But before you do, theres a lot you need to know/learn for your upcoming roofing project. Slope Limitations: On low-slope roofs, which include 2:12 up to 4:12 pitch, felt courses should overlap a minimum of 19 inches. Not only will the shingles not do their job properly, but the manufacturer also wont stand behind their product because the installation instructions werent followed. A handy roof slope estimator can help you determine if your roof slope is likely too low for shingles. For over 30 years, the team at Bill Ragan Roofing has helped thousands of homeowners in the Nashville area find the right roofing material that fits their budget and situation. "I recently had my roof replaced and Bill and team did an excellent job! Some roofers cover their bases by applying ice and water . 1503.6Crickets and saddles. For metal panel roof systems, NRCA recommends slopes of 1/2:12 or more for structural panel systems and 3:12 or more for architectural panel systems. Normal shingle installation is allowed for all roofs with a pitch of 4/12 and above. Request a FREE roof inspection, and protect your family and your home investment this hurricane season. Weve provided thousands of homeowners with an experience rare in the roofing industry, and we know we can do the same for you. This is something yourlocal roofing contractordoes during their inspection for your upcomingroof replacement. The Complete Guide to Purchasing a Roof has all the information you need for your roof replacement and ensures you make all the right buying decisions. But if you're going for shakes, you'll need to . Apply 1" spots of asphalt roofing cement under each corner and at about 12" to 13" in from each edge. You can still try to get the problem fixed with yourroofing contractors workmanship warranty. If your roof is less than 2 vertical units (inches or feet) up for every 12 horizontal units out, its considered low slope. The only major difference is that PVC is slightly more flexible and has been around longer than TPO. How Much Should A Roof Slope. While roofs with a 4/12 pitch and steeper are ideal, the minimum roof pitch for shingles is 2/12. You'll follow the manufacturer's directions (usually printed on the package) for low slope conditions. Minimum Pitch/Slope of An Asphalt Shingle RoofShingles of all types need to have a slope to function properly. But why cant you put shingles on a low slope or flat roof? The 2/12 number is rise over run or two units of vertical for every 12 units horizontal. Its in the form of a ratio thats calculated by the number of inches or feet it rises vertically for every 12 inches or feet it extends horizontally. The minimum requirement is 2/12. On steep-slope roofs (4:12 and steeper), upper courses of felt underlayment should overlap lower courses by at least 2 inches. Minimum thickness of the outside edge of plastic caps shall be 0.035 . Even the installation process is pretty much the same. Asphalt shingles continue to be the most widely installed roof covering option in North America. Some building codes allow as low as a 2" slope with asphalt shingles if additional steps are taken. Standing water on the roof can eventually seep under shingle edges. What is the minimum slope for asphalt shingles with single layer underlayment? And at the very end, youll get a complete roof replacement guide that gives you all the information you need to know about a replacement. A roof with such a slope has quite the angle to let water and snow run. You are required to have a double layer of asphalt saturated felt paper or a single layer of ice & water shield under your shingles. It has better aesthetics with more color options and is longer-lasting than the membrane roof systems. Use a membrane roofing system for roof slopes less than 4:12 (1:3). It is common to install shingles at a roof pitch of 4/12 as the 2/12 roof pitch rule is only a minimum. This provides a double layer of underlayment across the entire roof. Building codes may play a role in whether or not you can have asphalt shingles installed on your roof. We do install shingles on these in between pitches but special application measures must be taken in this middle ground. Its in the form of a ratio thats calculated by the number of inches or feet it rises vertically for every 12 inches or feet it extends horizontally. In recent decades, home designs have tended toward steeper roofs, but there are many instances where a house may have a lower roof slope, or a portion of the roof that is at a lower slope. If your roof is less than 2 vertical units (inches or feet) up for every 12 . But if they were willing to ignore installation instructions, I guarantee they wont stand behind their work. However, since it is not that steep, the flow will not be as quick as the steeper roof. But, Lile continues, for double-layer T-lock or double-layer individual lock-down shingles, the minimum valley slope should be 5" in 12". by Ryan Nielsen | Apr 21, 2013 | Buying Tips. PVC (polyvinyl chloride) is also a single-ply white membrane used in commercial and residential roofing. Be aware; I dont recommend trying to get on your roof to measure its pitch. Well begin this article with a quick overview of what roof pitch is. For asphalt shingles, which are popular because of their ease of installation, durability and low cost, the minimum pitch is 2:12 on a roof deck that must be solidly sheathed. The minimum slope for a shingle roof ranges from three-pitch to nine-pitch. It is common to install shingles at a roof pitch of 4/12 as the 2/12 roof pitch rule is only a minimum. As long as its properly installed and your attic is adequately ventilated, theres no reason you shouldnt get at least 30 years out of your standing seam metal flat roof. Additional underlayment protection with special application methods are required when asphalt shingles are installed on a low slope roof, following the manufacturer's application instructions. In actuality, the minimum pitch for shingles recommended by some manufacturers is 2:12, not 4:12. Fill out ouronline form or contact 214-321-9341. This number corresponds to the number of inches of rise in a 12-foot run. A 3" per foot slope is considered low, but may be acceptable if a double layer of felt is used. What is the recommended roof pitch? This could not have gone more smoothly. However, due to manufacturing variances, the limitations of your monitor resolution and the variation in natural exterior lighting, actual colors may vary from the images you see. While its used mostly for commercial properties, EPDM is still used in residential roofing. We do not recommend the application of our roof shingles directly to any type of roof insulation, including perlite or fiberglass, foam, wood fiber, or similar products. The minimum requirement is 2/12. In fact, the National Roofing Contractors Association advises only using shingles on roofs within this range to prevent leaks and protect roofs, especially in regions that experience high annual snowfall and rain. LinkedIn and 3rd parties use essential and non-essential cookies to provide, secure, analyze and improve our Services, and to show you relevant ads (including professional and job ads) on and off LinkedIn. Do you need a freeestimate for your roof? Asphalt shingles shall be fastened to solidly sheathed decks. If your answer is yes, then we have just the guide you need. Wouldnt it be great if things like cost, roofing material options, the components that make up a roof, and more were all in one place? There are differing opinions as to the minimum slope for a roof, but the generally accepted minimum is 3/12. Learn more in our Cookie Policy. You can update your choices at any time in your settings. Like TPO, you can expect to get 25 years out of a PVC flat roof as long as its installed properly. A shingle roof, like this North Dallas garagein the photo above, may have a failure, no matter how good a job the installer did. A.J. PVC (polyvinyl chloride) is also a single-ply white membrane used in commercial and residential roofing. and slope, except metal cap nails shall be required where the ultimate design wind speed, . One of those specifications involves the pitch and slope of the asphalt shingle roof. Below we give you the best roofing materials for a low slope or flat roof. If you have a roof thats 2:12 or steeper, youre good to go with your asphalt shingle installation. This types of roofs will usually have a pitch of :12. For asphalt shingle, clay and concrete tile, metal shingle, slate and wood shake and shingle roof systems, NRCA recommends slopes of 4:12 or more. The minimum requirement is 2/12. Under the ideal conditions, a standing seam metal flat roof could last for 50 years. Flat roofing materials like TPO, PVC, EPDM rubber, or others should be used on any slope with a pitch of less than 2/12. Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal (17-percent slope) or greater. This allows for panels to expand and contract freely when the metal panels go through thermal expansion. So, that begs the question, Whats the minimum roof pitch for asphalt shingles?. Below we give you the best roofing materials for a low slope or flat roof. That works out to about nine degrees if that works better for you. What is the Minimum Roof Pitch for Asphalt Shingles? Because its a black membrane, I wouldnt recommend using it over a bedroom or living space because itll absorb the heat. IKO assumes no responsibility for errors that may appear on this website. The International Building Code recommends using asphalt shingles only on roofs with slopes over 2:12. Now you know the 4 best roofing materials for a low slope or flat roof. But why can't you put shingles on a low slope or flat roof? This means two layers of roofing paper must be attached to the roofing deck and under the . Any slope lower than 2/12 will often require the use of roofing materials like single-ply membranes or built-up . A qualified roofer best will be the best choice for calculating your roofs slope. Asphalt shingles are the most commonly used roofing material in the country. And at the very end, youll get a complete roof replacement guide that gives you all the information you need to know about a replacement. appointment at your property. Shingles arent meant to hold or have sitting water on them. This minimum slope requirement can be found in the installation instructions for almost every manufacturer and in many building codes. R905.2.1 Sheathing requirements. Because of this durability, you can expect to get 25 to 30 years out of a fully adhered 0.060 thickness EPDM flat roof. And of course, their ease of installation and adaptability to just about any roof shape is another reason for their success. For asphalt shingles, a slope of 2:12 has long been considered the minimum acceptable for use on a roof. For all Owens Corning shingles, roofing nails should penetrate into the wood deck by a minimum of -inch or completely through the roof deck by a minimum of 1/8-inch. This is something your local roofing contractor does during their inspection for your upcoming roof replacement. To view or add a comment, sign in. A standing seam metal roof system is a series of metal panels that are locked together at the seams or seamed mechanically. The minimum pitch for shingles is 1:6, which is equivalent to 4 inches rise to 24 inches run. To help understand the issue better, lets take a look at how roof slope is measured and other considerations. What is the minimum pitch/slope of an asphalt shingle roof? Heres Your Complete Guide to Purchasing a Roof, so youre able to make all the right decisions for your upcoming roof replacement. Flat vs. Pitched Commercial Roofs: Which Is Your Best Option? Explore the rest ofour websitefor more educational tips. Shingles of all types need to have a slope to function properly. Because of this durability, you can expect to get 25 to 30 years out of a fully adhered 0.060 thickness EPDM flat roof. Now you know you cant install asphalt shingles on a low slope or flat roof. This is known as 2:12 slope. The minimum roof slope permitted for issuance of an asphalt shingle roofing Warranty Certificate is 4:12 (1:3). To maintain your warranty, the minimum pitch for asphalt shingles should be NOT less than 3 in 12 (18). HeresYour Complete Guide to Purchasing a Roof, so youre able to make all the right decisions for your upcoming roof replacement. The 2/12 number is rise over run or two units of vertical for every 12 units horizontal. PVC and TPO are also very similar in their characteristics besides their chemical make-up. . Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal (17-percent slope) or greater. No matter what, dont install asphalt shingles if your roofs pitch is below a 2:12. One of those specifications involves the pitch and slope of the asphalt shingle roof. Select Accept to consent or Reject to decline non-essential cookies for this use. BUILDINGS EXPERIENCE . (As always proper safety equipment and precautions must be followed when working on any roof). Minimum Pitch/Slope of An Asphalt Shingle Roof Shingles of all types need to have a slope to function properly. installed) and architectural ($5 to $15 per sq.ft. Plywood shall be a minimum of 3/8" thickness and . . Give us a call today. As long as itsproperly installedand yourattic is adequately ventilated, theres no reason you shouldnt get at least 30 years out of your standing seam metal flat roof. If your existing roof has shingles on it and its time to re-roof, you can very likely use shingles again, but on questionable lower slopes its best to confirm the slope is above the 2:12 minimum just to be sure. They provide excellent weather resistance, great value and, now more than ever, a tremendous range of beautiful designs and color blends. If a roof slope rises, say, 4 inches when measured 12 inches along the bottom of a horizontal roof truss, the roof slope is said to be 4:12; i.e., 4 inches of rise per 12 inches (one foot) of run. Having new asphalt shingles installed on a roof in need of repair can oftentimes improve the energy efficiency of your home and, of course, its a big cosmetic improvement. No matter what, dont install asphalt shingles if your roofs pitch is below a 2:12. At slopes below 2:12, a granule-surfaced asphalt membrane can be installed, and many are available in colors to complement the shingle colors. This eliminates the possibility of ponding water after a rainstorm. Determine the minimum slope of the roof based on . 1507.2.1 Deck requirements. 2022 Bill Ragan Roofing CompanyAll Rights Reserved. A qualified roofer will be able to let you know whether asphalt shingles are appropriate for your house. But there are certain situations where they cant be installed. Now we want to do the same for you. ROOF SLOPE / ROOF DECKS: Never apply asphalt shingles to roof slopes less than 2:12. Asphalt shingles should never be applied to roof slopes below 2:12 (2" of vertical rise for every 12" of horizontal run, or 9.5). So, that begs the question, Whats the minimum roof pitch for asphalt shingles?. The 2/12 number is rise over run or two units of vertical for every 12 units horizontal. The Minimum Roof Pitch for Regular Shingles. Roof pitch refers to the steepness of a roof as a ratio relative to absolute flatness. Code interpretation: This section implies that asphalt shingles shall only be applied on roof slopes of 2:12 or more. The black membrane also wont get as dirty as a white membrane if you can see it from a window. While its used mostly for commercial properties, EPDM is still used in residential roofing. In many building codes, allowances are made to permit applications of asphalt shingles to low sloped roofs. Organic roll roofing can be installed on roofs with a minimum slope of 1 inch and, while asphalt roll roofing can be installed on a 2-inch slope in an emergency, a minimum slope of 3 inches is recommended. You can still try to get the problem fixed with your roofing contractors workmanship warranty. Roof pitch is simply the steepness (angle) of your roof. Learn what the minimum slope for an asphalt shingle roof is, the difference between sloped and flat roofs and how to calculate the slope of any roof. What is the minimum Pitch/Slope of an Asphalt Shingle Roof? The minimum roof pitch for shingles is a 2:12 pitch. . But before you do, theres a lot you need to know/learn for your upcoming roofing project. What slope do you need for shingles? If you want to know whether you can improve the look of your home with asphalt shingles, they can give you all the information you need to make that determination and ensure that the installation is done correctly. The minimum roof pitch for shingles is a 2:12 pitch. For roof slopes from two units vertical in 12 units horizontal (2:12) up to four units vertical in 12 units horizontal (4:12), double underlayment application is required in accordance with . That works out to about nine degrees if that works better for you. The minimum requirement is 2/12. Asphalt shingles continue to be the most widely installed roof covering option in North America. If you have a roof thats 2:12 or steeper, youre good to go with your asphalt shingle installation. According to this code, the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. The minimum requirement is 2/12. Asphalt shingles shall be used only on roof slopes of two units vertical in 12 units horizontal (17-percent slope) or greater. Some manufacturers recommend two layers of #15 felt to be lapped 18" on such roofs. You might think you can avoid problems by ignoring the installation instructions to save money. A minimum pitch of 3-in-12 or even 4-in-12 will normally be required. Asphalt shingles can only be used on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. What is the Minimum Slope for an Asphalt Shingle Roof. {{cta(554e69d1-0e82-4060-80ef-b83fbcab0001)}}, AJ Wells Roofing & Construction5651 Colcord AvenueJacksonville, FL 32211, General Contractor License: #CCC1328871 & #CGC1511202, 2019 All rights reserved | Designed by Get Em Tiger. Type of Roofing Minimum Slope Maximum Slope Asphalt Shingles Low slope application 1 in 6 no limit Normal application 1 in 3 no limit Built-up Roofing Asphalt base (without gravel) 1 in 25 1 in 2 Asphalt base (gravelled) 1 in 50(1) 1 in 4 Coal-tar base (gravelled) 1 in 50(1) 1 in 25 Cold process 1 in 25 1 in 1.33 Cedar Shakes 1 in 3 no limit Roof pitchis simply the steepness (angle) of your roof. It also establishes a shingle's minimum Class A . R905.2.2 Slope. Please refer to our Legal Notices for U.S.A. or our Legal Notices for Canada. Mike, The usual slope for asphalt shingles is a 4" or greater rise for every horizontal foot of run. PVC and TPO are also very similar in their characteristics besides their chemical make-up. Asphalt Shingles Minimum Roof Slope (Roof Pitch) | R905.2.2 Asphalt shingles can only be installed on roof slopes of 2:12 or greater. The standard establishes prescriptive minimum and maximum values for asphalt shingles' masses and physical property values. Some people recommend not installing asphalt shingles on slopes below 5/12, but a skilled roofer may well be able to make this work. The slope of the roof is measured by the vertical rise of the roof to the horizontal run and is expressed as a fraction. To finish this article off, youll learn the 4 best roofing materials for a low slope or flat roof since shingles wont be an option. Not only will the shingles not do their job properly, but the manufacturer also wont stand behind their product because the installation instructions werent followed. The challenge with very low sloped roofs is simple gravity. Roofing shingles can still be installed on a low sloped roof, provided that minimum roof slope for shinglesas met the requirements. It is not that hard to calculate, actually. EPDM is extremely durable and is basically like having a bulletproof rubber roof system. The minimum roof pitch that you should install shingles at is 2:12. Steep-Slope Roof Systems Asphalt Shingle Roof System: Manufacturer ten (10) year Non-Prorated and forty (40) year Prorated warranty shall both be specified for new construction or re-roofing Projects. All rights reserved. Closed-cut shingle valleys work fine with strip shingles, and laminated asphalt shingles. For roof slopes from two units vertical in 12 units horizontal (17% slope) up to four units vertical in 12 units horizontal (33% slope), double underlayment application is required. TPO (thermoplastic polyolefin) is a single-ply white membrane used in both commercial and residential roofing. The minimum pitch required for shingles is 2/12 which means for every 12 inches, the roof rises 2 inches. Can you shingle a 1.5 pitch roof? That works out to about nine degrees if that works better for you. The inclinations of this roof will be from 1:12 to . If your roof is less than 2 vertical units (inches or feet) up for every 12 horizontal units out, it's considered low slope. What is the Minimum Slope for an Asphalt Shingle Roof The short, simple answer is 2:12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
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