Minimum roof slope for asphalt shingles

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Roofing Types and Slope Limits Forming Part of Sentence 9.26.3.1.(1) 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 ... One of the most prominent and popular elements of residential architecture is a steep-slope roof. According to the Occupational Safety and Health Administration (OSHA), steep-slope roofs have slopes greater than 4/12 and range from 18.5 degrees to 45 degrees or more. Dec 28, 2018 · Match the roofing on the covered porch with the main roof. Determine the minimum slope of the roof based on the roofing material. The minimum pitch for shingles is 1:6, which is equivalent to 4 ... What is roof slope and does it limit the choice of shingles? Asphalt shingles can only be used on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. The slope of the roof is measured by the vertical rise of the roof to the horizontal run and is expressed as a fraction. A "4:12 roof slope" means the roof rises 4 feet Asphalt, roofing: Asphalt that is refined or processed to meet specifications for roofing. Built-up roofing (BUR): A system of asphalt-impregnated felt plies sealed and surfaced with hot mopping-grade asphalt. BUR is primarily used in low-slope commercial roofing. The felt plies can be organic (e.g., cellulose), fibrous screen or mat, or ... If your roof pitch declines up to 1 inch vertically for every 12 inches horizontally (1:12 pitch), it is a good candidate for rolled roofing as long as you use the concealed nail method of fastening. Otherwise, the safest minimum pitch for rolled roofing is 2 inches of decline per 12 inches of horizontal direction (2:12 pitch). For metal panel roof systems, metal shingles and metal shingle panels, NRCA recommends a minimum of one layer of No. 30 asphalt-saturated felt applied horizontally in shingle fashion on roof decks having a slope of 4:12 (18 degrees) or more. For roof decks having slopes of 3:12 (14 degrees) up to 4:12 (18 degrees), a minimum of two layers of No ... 1507.2 Asphalt shingles. The installation of asphalt shingles shall comply with the provisions of this section. or RAS 115. 1507.2.1 Deck requirements. Asphalt shingles shall be 1 fastened to solidly sheathed decks. 1507.2.2 Slope. Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal ( 17- If old asphalt shingles are to remain in place, nail down or cut away all loose, curled or lifted shingles. Sweep the surface clean of all loose debris just prior to applying the new roofing. Ensure proper size and length of fasteners. If roofing over old wood shingles, cut back the old shingles at eaves and rakes and apply wood edging strips. Roofing Types and Slope Limits Forming Part of Sentence 9.26.3.1.(1) 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 ... Permits issued prior to January 1, 2015, for the replacement of an existing roof with asphalt roof shingles or asphalt composition roll roofing. To find CRRC-rated products that comply with the ordinance, visit the CRRC online Rated Products Directory and search for the minimum required values using the "Minimum Radiative Properties" tab. Roof slope shall be 1:3 or steeper. For slopes 1:3 to 1:6, provide special underlayment requirements. Follow the more stringent of the CAN3 A 123.52 Asphalt Shingle Application on Roof Slopes 1:6 to Less than 1:3 instructions or those of the local building code. F. Never apply asphalt shingles to roof slopes less than 2:12. Sep 11, 2018 · Manufacturers of asphalt shingles recommend a pitch of 4/12 or more, but the absolute minimum pitch is 2/12. Pitch is measured in inches of vertical rise of the roof over one foot (12 inches) of horizontal run. So a 4/12 pitch roof rises 4 inches for every 12 inches of horizontal run. Asphalt shingle roofing is designed to shed water that is flowing downward over its surface, with each shingle overlapping the one below. Furnish and Install new roof boots etc. for all roof penetrations Furnish and Install new aluminum coil stock to cover all fascia and roof trim. Verify Color with Owner. All shingles shall be installed by galv. Roofing nails ____" long Note: 4 per shingle minimum, 6 per shingle in high wind areas and the coast line. OR Stapled with ____" designated in Table R301.2(1), an ice barrier shall be installed for asphalt shingles, metal roof shingles, mineral-surfaced roll roofing, slate and slate-type shingles, wood shingles and wood shakes. The ice barrier shall consist of not fewer than two layers of underlayment cemented together, or a self-adhering Commercial Roofing - Guide to Low-Slope Systems. Other Residential Products (Vents, Siding, Roll Roofing) 1504.4 Ballasted low-slope roof systems. Ballasted low-slope (roof slope < 2:12) single-ply roof system coverings installed in accordance with Sections 1507.12 and 1507.13 shall be designed in accordance with Section 1504.8 and ANSI/SPRI RP-4. 1504.5 Edge securement for low-slope roofs. Low-slope built-up, modified bitumen and single-ply roof ... The International Code Council (ICC) is a non-profit organization dedicated to developing model codes and standards used in the design, build and compliance process. May 11, 2018 · Steep Slope - Roof pitch of 12 or 45 degrees. Medium Steep Slope - Roof Pitch of 9; Medium Slope - Roof Pitch of 6; Medium Low Slope - Roof Pitch of 3 or 4; Note that if your roof has a low slope (below 3 pitch) asphalt shingles are NOT the right material for it. As an example, a roof could rise 5 inches for each 12 inches of horizontal distance. This would be a roof with a slope of 5:12. Roof slope is important because the slope dictates how the roof is applied. The standard application practices detailed in the PABCO® Installation Instructions are intended for roofs with a slope between 4:12 and 20:12. What is roof slope and does it limit the choice of shingles? Asphalt shingles can only be used on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. The slope of the roof is measured by the vertical rise of the roof to the horizontal run and is expressed as a fraction. A "4:12 roof slope" means the roof rises 4 feet Jul 16, 2001 · I have a low pitch, 1.5 in 12, roof over a porch extending from a house with asphalt shingles. Presently, it has a torch down on it. Can I put a standing seam metal roof on the porch roof and over the torchdown? I live in the Seattle area. We may have snow once or twice a year. If so, how do I blend the asphalt shingle unto the metal roof? 4.6 Roof Slope Limitation: Minimum roof slopes must be 2:12 (16.67% slope) for Elite Glass-Seal and Heritage Series Shingles. 4.7 Reroofing: The existing asphalt shingle roof covering must be inspected in accordance with the provisions and limitations of Section 1510 of the IBC, Section R907 of the IRC, or Berkeley Electronic Press Selected Works Apr 01, 2001 · As a result of this experience, I would limit the application of asphalt roof shingles to roofs that are 4/12 and steeper. The National Roofing Contractors Association recommends that asphalt shingles be installed only on roofs with slopes that are 3/12 and greater. The asphalt shingle manufactures recommend that you install asphalt shingles on a recommended minimum of 4 in 12 or greater however most manufactures will warrant their shingles down to a 2 in 12 pitch if the recommended installation method is used. Installation on roof slopes below a 2 in 12 pitch is not recommended at all. Sep 11, 2018 · Manufacturers of asphalt shingles recommend a pitch of 4/12 or more, but the absolute minimum pitch is 2/12. Pitch is measured in inches of vertical rise of the roof over one foot (12 inches) of horizontal run. So a 4/12 pitch roof rises 4 inches for every 12 inches of horizontal run. Asphalt shingle roofing is designed to shed water that is flowing downward over its surface, with each shingle overlapping the one below. Typically, low slope metal roof systems vary in weight from 40 to 135 pounds per 100 square feet, making them among the lightest roofing products and the easiest to install. A lightweight roofing system also places fewer demands on a building’s structural support system, an important consideration in earthquake-prone areas. May 02, 2011 · Minimum slope is commonly listed on the material, at least 1/2-inch per linear foot of roof, though many types require a greater angle. Some manufacturers of mineral surface roll roofing specify a ... LOW SLOPES:All roof shingles applied to a low slope deck (2" to below 4" per foot) require the use of CertainTeed WinterGuard® Waterproofing Shingle Underlayment, or its equivalent,* applied over the entire deck surface. Consult the WinterGuard and individual shingle application instructions for details. Finding the right products for your low-slope roof. Residential low slope roofing can generally be divided up into two broad categories: larger flat roofed applications (low slope) such as residential condominium complexes, row homes, and town houses and smaller applications such as residential porch and garage transitions from the main home where the slope of the roof changes dramatically ... Asphalt shingles shall be used only on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. 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 Section R905.2.7. Notice the roof valley at the left side of the screened porch, which is an addition. The slope of it is low. Was built with a permit, I’m told. What are the rules on the use of asphalt shingles on low-sloped roofs. I seem to remember that < 4/12, 2 layers of felt should be used (could not confirm that in this case). At what slope are shingles not allowed? What would you estimate the slope of ... tip of each successive shingle row with the valley line decreases as a roof plane’s slope increases. Most archi - tectural asphalt shingles have a specified offset distance designated by the manufacturer. If the offset distance is specified, the dimension may not be achieved unless the first shingle in each row is trimmed. Therefore, it is abso - Minimum roof slopes must be 2:12 (16.67% slope) for the laminated shingles described in Section 5.1 of this Report. 6.1 Underlayment and Ice Barriers: For roof slopes greater than 4:12, the roof deck must be covered with a minimum of one layer of underlayment as described in Sections 7.2 and 7.3 of this Report. GOOD ROOFING PRACTICE STEEP-SLOPE RE-ROOFING ASPHALT SHINGLE ROOFING 1:3 (4/12) AND GREATER Revised January 6, 2011 1 DECK 1.1 General a) Application of asphalt shingles directly over rigid insulations is not permitted. b) Asphalt shingles must be applied to wood decking. For re-roofing applications to