Downspouts should be included in the cost estimate from your contractor. ft. 875” for 701-828 pages. Stramit Commercial Eaves Gutter is suitable for: varying degrees of rainfall and roof sizes. Choose Your Settings. Those who have metal or tile roofs should also think of 6-inches as the minimum size requirement. Gutter Size = (2,000 sq. Half RoundBeaded Deep FlowVictorian OgeeMoulded OgeeBullnose. Step 1: Enter you house/building/structure ground dimensions, including roof overhangs (if your roof has overhangs, ADD [overhang width * 2] to each house side that has an overhang). For the gutter calculator click here. The size of the downspout should be constant throughout its length. 00. The minimum pipe size needed for a catchment area of 23 m2 m 2 is calculated to be 23 cm2 c m 2 using the rule of thumb in Equation 6 as shown below: The needed cross-sectional area of gutter is 23 cm2 c m 2. However, it’s important to consider other factors, such as the size and material of the gutters. Small Roof (Less than 1,000 square feet) Larger buildings will need longer gutters. Method used The method used is based on the flow chart Fig 3. The 6” SAF Gutters are specifically designed for industrial & commercial buildings. Aug 14, 2023 · The first step in choosing the right gutter size is to calculate your roof’s surface area. 67 inches. 2 m), and the ratio of gutter depth to width is 0. 1200 in. Oct 24, 2023 · How To Use Roof Replacement Cost Calculator. F525 XPERT® Gutter. A gutter system for commercial use with a high rainfall carrying capacity and a curved base for improved self-cleaning and minimal build-up of water and dirt. Instructions & Notes: This program incorporates a simplified version of calculating the roof catchment area, and makes no allowance for rain shadow effects from vertical faces. We are among the top-rated service gutter contractors in Malaysia. 67-inch gutters for your residential property. Our custom rain gutters are reliable and will add to the appeal of your commercial property or home. Step 3: Find the Maximum Rainfall Intensity. Shingled Roofs. Nov 29, 2023 · So if you're printing through IngramSpark, you'd set your inside margin to . Residential and commercial roofs come in various shapes and sizes, so measuring accurately is crucial. Another reason that you would need 6-inch gutters, would Nov 24, 2020 · The scenarios can range from sizing gutters to reduce cost to testing extreme rainfall events to reduce risk. Opting for a 5-inch gutter is generally a good idea if you live in a dry climate where it doesn’t rain How To Calculate The Size Of A Gutter. Tile can be set higher above the roof line than other materials, causing the runoff to go farther. The bigger the gutter, the more water it can hold. Step 1: Calculate the Roof Area. Feb 6, 2024 · How to Use the Gutter Slope Calculator. Residential downspouts are commonly 2x3 or 3x4 inches, while commercial buildings may use larger ones. 1285 F: 33O. The app will provide SMACNA compliant options for rectangular duct with dimensions up to 120-inches for applications to ten-inch water gage (positive or negative). Let's get started! 1. Oversized downspouts will come at an additional cost. DIY QUOTE 10% OFF. Example: 40 ft. Feb 1, 2024 · Five-inch K-style gutters use 2-inch by 3-inch downspouts. 3 Plastic Tubing Drainage Chart and should be used for estimating purposes only. Contact us today to learn more about our metal panel trim options. Downspouts should be constructed with conductor heads every 40 ft (12. Standard box gutter sizes often range from 100mm to 200mm in width and 75mm to 150mm in depth. At The Guttermen Commercial, we have 2 different sizes of Seamless K Style gutters for you to choose from: 7-inch and 8-inch. 9 in 12 to 11 in 12 1. Steel guttering is heavy and must be To limit the effects of thermal expansion in gutters, 50 ft. 1 4. 24″. Keep in mind that these are general guidelines, and it’s always best to consult with a professional to determine the ideal gutter size for your specific home. This ensures that gutters are installed or Gutter Calculator. Roof pitch is expressed as the inches Apr 30, 2024 · Using the Gutter Cost Calculator is straightforward: Enter the length of the gutter needed in feet. Multiply the surface area by the pitch factor to find the rain collection area for your roof and you can buy the right size guttering. Get accurate results and stay within NEC guidelines. Trying to choose the appropriate gutter and downpipe sizes can be too much of a hassle. X 12 in = 480 in. This app allows you to create table driven solutions using the methods and formulas covered in SMACNA’s HVAC Duct Construction Standard (Metal and Flexible). $ 29. Weight (In pounds) THESE CALCULATORS ARE FOR INFORMATIONAL PURPOSES ONLY. This adjusted size helps you figure out the right gutter size for your home. Increase the pitch of the gutter. Determining the number of downspouts revolves around a general rule of thumb: for every 30 to 40 feet of gutter, install a single downspout. 1, and the rainfall intensity in your Also, of great importance is the size of your gutters and this matters a lot for how well they will work. (see below) Calculate the adjusted square footage by multiplying the square footage of the gutter’s drainage area by the roof pitch factor and the rainfall intensity. 125 aluminum interior strap they may be ordered with an optional support bracket. Voltage (V): Denotes the voltage across the gutter, measured in Volts (V). These downspouts can be either shaped like a K or have a Take a look at the significance of choosing the right downspout size for effective rainwater diversion from a home's roof to prevent damage. 12 in 12 or higher 1. 4-in-12 to 5-in-12. All gutter systems in the UK should be designed to BS EN 12056-3:2000 Gravity drainage systems inside buildings. Therefore, get rid of your guttering problems by giving us a call! Metal Roof Doctor is here to help. A common gutter style is usually 5 inches wide, while 6 or 8-inch sizes are available for larger roofs. The capacity of a sloped rectangular gutter may be approximated by using a gutter cross section area not less than that of a semicircular gutter and a depth to width ratio of at least 0. While there is a standard size of the gutter, there is a trend towards larger gutters. The industry’s first estimator showing the reduction of installation labor for Southwire® Cable-in-Conduit (CIC) compared to pulling cables into PVC ducts. This may be deepened if loc is less than 60mm. The size of your roof plays a pivotal role in determining the capacity your gutters need to handle. While a temperature controller is recommended for all heat tracing applications, in this case it should be considered essential. The standard is about ¼ inch per 10 feet. See full list on saf. 6 in 12 to 8 in 12 1. In general, 5-inch gutters are usually enough, but areas with heavy rainfall might need 6-inch gutters. Flat Roof Calculator. These are as follows: . When To Consider 7- or 8-Inch Gutters. The calculator helps ensure accurate measurements, thereby reducing wastage and cost overruns. 5. The correct size depends on gutter capacity, roof pitch, and rainfall intensity. 425. In most climates, gutters are installed in one of two standard size widths: 5-inch or 6-inch. . The right box gutter size for your home (or business) depends on factors like the type and size of your roof, and what the weather is like where you live. 2021 Part 3 Storm Water Drainage. Suggested Price . Multiply the surface area by the pitch factor to find the rain collection area for your roof. = Definition. Gutter Style gutters are typically K-Style and Half-Round Styles though custom profile are available. X 480 in X 5. Since the slope is 6 in. Flag Thickness (inch): Input the thickness of the flag in inches. (217 sq. 0 Inches per Hour. This tool is crucial for individuals in the construction industry, especially those dealing with roofing systems. Determining the Right Gutter Size. That is how much rain a roof can drain during the most intense rainfall. Round downspout sizes range from 3 inches to Jul 27, 2023 · Assume your roof area is 2,000 square feet, and the recommended slope is ¼ inch per 10 feet. curve with the shape of an elongated 'S'. Industrial roofing often requires larger gutter sizes to manage the substantial water runoff efficiently. This measurement is taken from the top opening of the gutter. Steel-built structures, listen up! The 7-inch gutters are your go-to. Downpipes must—. The important thing, is to ensure that each section of gutter, from the sump to the high point, drains the correct roof catchment area. How the Aluminum Gutter Roofing calculators are essential tools for roofing contractors and DIY enthusiasts alike. For reference, two of the most common gutter sizes are the 5-inch and 6-inch variants. Length(m)Width(m)Additional Area(sq m)Roof PitchRoof HeightAngle(degrees)Area(sq m) Step 3 - Enter Gutter Details. Rainline gutters are available in two shapes and five sizes. Select your unit type, cost type (by bag or by the yard/meter), bag size, cost and desired waste amount. The design is typical of the OGEE gutter system that incorporates a double. For domestic rainwater gutters calculations contact David Roy. Measure the length of the gutter for downspout Commercial and Industrial Wiring and Raceway Calculator. In April 2024 the cost to Install Gutters starts at $9. MBCI supplies gutters for our commercial steel panel systems. Use 100-Year Rainfall Stats to Size Your Buried Downspout System. 5 Downpipes — size and installation. They are available in various sizes, with commonly used sizes starting from 7 inches and can be customized to meet specific requirements. Ensure gutters handle the calculated rainfall volume for proper drainage. Let’s talk about how these sizes affect the water flow. 28#. Larger gutters, with their higher water holding capacity, need fewer downspouts. This will calculate capacities for an eaves gutter to BSEN 12056 Part 3. Six-inch gutters use 3-inch by 4-inch downspouts. Southwire's cable tray fill calculator takes the guesswork out of your project. This free online box gutter calculator will size box gutters and rain water heads in accordance with the Australian Plumbing Code AS/NZS 3500. Use the following calculator to help determine what length of cableand how many clips you need. 5″ and your gutter to . 39#. 1. A is 6 in/hr(152 mm/hr), the length of each gutter section is 40 ft. Overcurrent Protection Size Copper wire 75°C Terminal Conductor size based on 75°C terminal rating [110 These calculations are based on the Manning’s Roughness ASAE EP 260. (12. Proper installation and maintenance are crucial, with indicators of Enter larger gutter widths in the yellow boxes to find out how wide your gutters need to be given the length that you want to go between downspouts. Features and Benefits; Warranty: 20 year, 110 mph Excel Warranty. Re 3TM CIC Labor Saving Calculator. 44 - $14. Notes on using the Simplified Box Gutter Calculator. 6-Inch Box Gutters. Consult a Water Table Management Professional for design criteria information. 5” for 151-300 pages. Use the formula A = L x W where A is area, L is length and W is width. 1 AS/NZS 3500. A gutter is to be located on one of the 120 ft. 877-387-4218. If there are gutters, make note of the number of downspouts. Heat Tape Calculator for. (c) be selected in accordance with the appropriate eaves gutter section as shown in to . = 1200 in. 25 x 12) = 6. Step 3. Factors that need to be taken into account when choosing the size and style rainware for your project: size Jan 18, 2024 · For each gutter profile size and style, there’s a standard downspout size that’s made to fit with it like two pieces of a jigsaw puzzle. Gutter Sizing Step 2 – Research historical rainfall data. Rainware items available: two K gutter profiles for residential and light commercial applications, as well as custom gutters and custom downspouts. Dec 24, 2023 · Most homeowners report spending an average of $950-1,200 to install 100 ln. To convert that cross-sectional area to the diameter of the pipe, remember that the formula for the area of a Standard Box Gutter Sizes. You can choose the size, color, weight, and material for your box gutters. Follow these 3 simple steps to make the process seamless and efficient. LYSAGHT® products have been made in Australia for 100 years. 375” for 24-150 pages. But can be used for anywhere in the world provided you know the rainfall intensity requirements for your local area. The cost of downspouts will also be calculated by the linear foot. For rectangular or square roofs, you can simply . 625” for 301-500 pages. If you’re uncertain whether your building will experience excessive runoff for the 6-inch gutters, sizing up is a prudent choice. We take careful measurements, calculate proper gutter sizing and slope, use durable metal hangers spaced every two feet, and neatly seal all seams. Meets requirement for bigger roof catchment area. com or call 800-558-2162. 2 m) to admit air and prevent vacuum. By inputting the length of the gutter run and the height differential between the start and end points, the calculator provides the ideal slope. These calculators can quickly and accurately estimate the amount of roofing material needed for a given project, as well as provide estimates for costs and labor requirements. Step 2: Find the Roof Pitch Factor. 5” deep. 6 m) sides. (15. Determine your roof pitch. (35. 05. Curb Height (inch): Enter the height of the curb in inches. However 100 Years Celebration. However, in drier areas, 5″ half round gutters may be suitable. Calculates the area of an upper roof allowed to drain onto a lower roof via a spreader. Downpipes are available in four sizes: 75mm, 87mm Two Calculators are available . Use for joining our 6" commercial box gutter sections in Kynar Steel at a 90º internal corner. Home; Select a Size. Price: $25. We have carried out the calculations detailed in the standard for some of the main roof/gutter/outlet configurations normally associated with industrial and commercial buildings. The exact size required will depend on the factors mentioned above. Call us today at (855) 974-4669 or fill out our contact form and get a free quote. YOUR SALES REPRESENTATIVE WILL BE ABLE TO ADDRESS INDIVIDUAL PRICE AND QUANTITY CONCERNS. Dec 27, 2019 · However, the best way to make sure that you’re getting the correct size every time is to have a professional perform the assessment for you. Calculators for designing eaves gutters, box gutters, downpipes, pipes and open channels etc to Australian Standards. Ask gutter suppliers what size gutters will be needed to handle that amount. 4 in 12 to 5 in 12 1. Select a gutter type (K-Style, Half-Round) that matches your home’s design. Industrial series gutters and downspouts: 7in, 8in, 9in, 10in or 12in. At Klean Gutters Midwest, we can help you find a gutter solution that’s 100% right for your home. For commercial buildings that fall between the size of an average home and a larger structure like a warehouse, 6-inch box gutters emerge as the ideal choice. Input the cost per foot of the gutter material. (b) be located as close as possible to valley gutters; and. Gutter Calculator. STEP 4: INSTALL THE INSIDE STRAPS by hooking into the gutter’s hemmed edge. (15 m) is a practical maximum gutter length to be served by a downspout. This will calculate the size of chutes and hoppers draining from a flat roof to downpipes on the exterior of the building to BSEN 12056 Part 3. The most common size of K-style gutters for residential homes is 5 inches and 6 inches, though larger 7 and 8-inch options are available. Apr 11, 2023 · 1. ) / (0. (a) not serve more than 12 m of gutter length for each downpipe; and. Note any valleys in the roof (C) that exist where the heat cable will be installed. (790 sq m). Adaptations can be made. Its design features a lower front allowing water to overflow as required by the National Construction Code 2019. 5" gutters come with 2"x3 Standard residential gutter size is 5” wide for K-style gutters. Rainware by ATAS serves as a functional and attractive detail to roof systems. Calculating how much concrete you need for a curb or gutter has never been easier. Mar 28, 2024 · Now that we’ve covered the factors to consider, let’s discuss the recommended gutter sizes for various roof types. Minimum Top Opening Width Max Allows for any number of downpipes an up to 40 pipeline sections. Maximum rainfall intensity is also an important factor in determining the right roof gutter sizing. Step 5: Choose the Right Size Gutter. The standard size of commercial gutters is 6-inches. Divide the inch per hour watershed of the roof by the 5-minute rainfall intensity. If you have a 6-inch K-style gutter, you will Jan 24, 2024 · Multiply your roof’s size by a pitch factor (based on your roof’s pitch) and the maximum rainfall intensity. 0 m) can affect drainage capacity. In this formula: Current (A): Refers to the electrical current flowing through the gutter, measured in Amperes (A). Drainage Pipe Required (minimum diameter): Totals - Cost To Install Gutters. Thus each of the four downspouts will serve a 2338 sq ft. Kynar Color Option. Our custom box gutters come in 6″, 7″ and 8″ sizes and are made on the job site exactly how you want them. Feb 12, 2024 · A gutter slope calculator is a digital or physical tool designed to help homeowners and professionals determine the optimal slope for their gutter systems. To estimate costs for your project: 1. 75” for 501-700 pages. By providing these parameters, you can quickly calculate Nov 16, 2015 · Once you know pitch, you can find your roof-pitch factor in the table below. 3. K-Style sizes will typically range from 5" to 6". The result provides the recommended Without the gutters, water will fall and collect at the base of the home. Pitch Pitch factor. Feb 16, 2023 · Standard Gutter Sizes. As a general rule, eGutter™ recommends for roof areas that exceed 2800 square feet, a 6" K Style size with a 3"x 4 You can simply use our free gutter calculator here to estimate seamless gutter. For a simple gable roof, make two separate calculations for each slope. Rainware. Menu. Common gutter sizes for industrial facilities range from 6 inches to 8 inches in width, with downspouts measuring 4 inches to 6 inches in diameter. 10. 40 ft. 3:2003Downpipe and sump depth from Fig I4, with minimum sump depth 150mm. But here’s the twist – it’s closely linked to your chosen gutter size. Half Round: 100mm, 125mm, 150mm, 190mm and Rectangular 136mm. Add downspouts. Gutter Length(m)Number of OutletsEndCenterEven SpacingIrregular SpacingLeaf guardCorner Between Outlets. Determine the surface area of your roof. Style E. Available in a plain or ribbed finish, the Commercial Eaves gutter is roll-formed in lengths ranging from 500 to 9000mm. Style A. Details: All Commercial Gutters are custom sized and available in a variety of profiles to fit your building requirements. Allowable Width, Slope, Height and Length of Box Gutters. Amazon, however, has suggestions depending on the number of pages. Contact us at 017-485 8073 to schedule your free site inspection today. So that each section of gutter will not exceed 50 ft. This number will tell you what size gutter you’ll need. When it comes to 5-inch and 6-inch K-Style gutters, the standard downspout sizes available are 2 x 3 inches, 3 x 4 inches, and 4 x 5 inches. Gutter size. For further assistance, please email us at info@metalera. Maximum durability, dimensional stability, leak resistance. 8. 7" and greater are appropriate for churches and larger commercial buildings. Style C. 136O [email protected] Jan 24, 2024 · To choose the right gutter size: Measure the roof’s total square footage. At Storm Master, we want to be sure you are satisfied SMACNA GUTTER INSTALLATION INSTRUCTIONS. 100 ft. The size of a box gutter is usually defined by its width and depth. 08 per linear foot. 13 in of rain = 2,954,880 Total cubic inches of water. However, these dimensions can be customized according to the requirements of the building and the expected rainfall in the area. 30% bigger with 530mm overall girth. Manufactured in 10’ lengths with a heavy duty . For example, if your roof is 40 feet long and 20 feet wide, you area will be 800 square feet. Commercial grade gutters and downspouts: 4in, 5in, 6in or 7in Jul 22, 2023 · An Aluminum Gutter Coil Calculator is a digital tool designed to calculate the length of an aluminum gutter coil. Commercial downspouts. Gutter Width (inch): Specify the width of the gutter in inches. wide x 100 ft long. Example 4. If draining to a sump with a side overflow, somewhere along the box gutter use this calculator. Metal-Era recommends that you verify all data obtained. Enter the length of the gutter in feet into the designated field and click the “Calculate” button. 0 Cubic Feet. This will help you choose the right size guttering. The gutters outlet capacity should suit the downspout capacity. Step 4: Find Adjusted Square Footage. of gutters by a contractor. 75. The plan area of this building is 8500 sq ft. Larger gutters may require 3×4-inch downspouts for optimal drainage. X 12 in. If you have a 5-inch K-style gutter, you will need a 2 inch by 3-inch downspout. Increasing the pitch increases a gutter’s handling capacity, but the gutter may look askew over a long run. The results of the calculations are shown in a series of tables. Data Source: Peak Runoff Rate: 0 Gallons per Minute (GPM) 0 Cubic Feet per Second (CFS) Peak Runoff Volume: 0 Gallons. The calculator applies the formula GS = 0. May 26, 2024 · Commercial Box Gutters: Commercial box gutters are designed to handle large volumes of water typically associated with commercial buildings or structures with extensive roof areas. Consider local maximum rainfall intensity. On the high end, metal gutters such as Copper or Zinc cost as much as $2,500-$4,000 for 100 linear feet, while prices for budget friendly vinyl gutters can be as low as $500-600 (for DIY install). Offset of more than 10 ft (3. Using the Gutter Slope Calculator is a breeze. The code limit is 150mm for DP's and 26,800 sq mm for flat eaves gutters The program will calculate the size and number of downpipes (downspouts, leaders) required, and the eaves gutter sizes for any roof. You can choose a downpipe size and calculate the number required, and the corresponding Eaves Gutter size. Jun 4, 2023 · The size of the gutter and inch k style gutter you choose will depend on several factors, including cost, estimate, rain gutters, seamless gutter, the volume of water, diameter, and common sizes. Also, you can calculate the required number of downspouts based on square foot measurements and consult a gutter sizing calculator for more accuracy. Flat to 3-in-12. When that happens, you need a larger gutter system to catch the water. ft. Calculates all the flows and pipe sizes. com 2100 Case Pkwy N, Twinsburg, Ohio 44087 Toll Free: (877) 55CAMPO P: 330. Based on this calculation, you would need 6. 1. May 20, 2024 · In this article: Why Gutter Size Matters. This size sits squarely in the middle of the box gutter spectrum, designed for larger commercial buildings that surpass the 6-inch capacity. In South Africa, the most commonly used gutter sizes are the 125 mm residential and 150 mm industrial gutters (measured front to back at the widest point). Flat to 3 in 12 1. Adjust calculations for the roof pitch. This calculator uses the equations that are laid out in the SMACNA handbook. (152 mm/m), factor 1. The calculator instantly computes the total cost based on the length and cost per foot, saving time and ensuring accurate budgeting. Use our Cost Calculator for cost estimate examples customized to the location, size and options of your project. Click the “Calculate” button to get the total cost estimate. Gutters that are rounded are typically 6” wide and are 3. Aug 23, 2022 · Start by taking the area of roof. Apr 28, 2024 · The formula used to calculate the size of electrical gutters is relatively straightforward: Gutter Size (mm2)=Current (A)×Voltage (V)×Constant Factor. The above recommendations assume that you have properly sized downspouts every 40 feet. Enter the Diameter of the pipe (inches): Enter the Grade (%): %. For more background, NZMRM have an old article on the Calculator called "Gutter and Downpipe Design". Use our product calculator to get an accurate estimate for what it will cost to protect your house with our gutter systems. 75” deep. /ft. Nov 23, 2023 · Guideline for Downspouts Based on Gutter Size. Feb 3, 2024 · The standard for medium to small commercial gutter needs is 6”. (868 sq m). 12 9/16″. Remember, two gutter lengths can share the same downspout, so if you calculate the max gutter to be 40 feet, you could put a downspout halfway in an 80 foot length. 3. The highest durability comes from 24 gauge galvanized steel or heavy aluminum. 6 Roof Drainage. Striking a balance, this size provides ample capacity to manage water runoff effectively without being excessively large. Effective cross-sectional area of 22,000mm2. A 5” wide gutter is 3. We ensure downspouts drain water at least 5 feet from your foundation to prevent water damage. 3 . The NZMRM CoP provides details on roof drainage design and what drives the Calculator in the CoP section 5. Five-inch gutters will normally use 2 x 3 inch downspouts; six-inch systems use 3 x 4 inch downspouts. Half-round gutters use rounded downspouts. An expansion joint will be installed in each gutter between the downspouts. Greater effectiveness. 10 is used (Table 1-1), making the design area 9350 sq ft. Miter Galv 24g 6" Commercial Box Kynar Finish 90º Inside. All miters are fabricated from the same Kynar 500® Steel as matching gutter sections. Next, include 100 Year 24 hours rain amount. For example, if your gutter’s drainage area is 1,000 square feet, your pitch factor is 1. 2 m), three downspouts will be used with 2 gutter expansion joints. Inside straps should be installed at 30” centers and alternate with the support bracket. and rivet it ‘s back leg to the gutter (DO NOT NAIL) with 1/8” x 3/8” aluminum rivets. That is, if you decide to include vertical faces on all Safintra supplies a popular range of aluminium and Aluminium Zinc gutters. Length (ft): Enter the length of the curb and gutter barrier in feet. Using roofing calculators for simple calculations can save a tremendous amount A length with a * denotes that the power delivered by the cable is more than enough to bring the pipe to your chosen setpoint. 5 * (L / 10), where GS is the gutter slope and L is the length of the gutter. 2. This calculator serves as an information source only. FL-1000. Products Selection. That will show how much water a gutter will have to drain. Apr 13, 2022 · These downspouts come in 2 inches by 3 inches and 3 inches by 4-inch options. Steel offers exceptional durability for commercial purposes. This free online box gutter calculator will calculate the size of box gutters, and sumps with a side overflow, in accordance with the Australian Plumbing Code AS/NZS 3500. Roof drainage, layout and calculation (AMD 17041), 2000. For half-round gutters, 6-inch gutters are the standard and more than capable of handling the harshest weather conditions. In plastic K Style, 5 inch guttering will drain up to 5520 ft², 6 inch up to 7960 …. Sep 4, 2023 · How to Use the Calculator. Materials Used for Commercial Guttering. Read More. Curved base allows the gutter to practically clean itself Range of easy fix guttering accessories 26″. Largest spacing (m) Step 4 - Select the Gutter and Outlet. 125″. Unique gutter design ensures long-lasting sturdiness and reliability. This Gutter Sizing section provides 4 steps to properly size a commercial gutter & downspout configuration for SAF Perimeter Systems commercial gutter designers, contractors, and building owners: Gutter Sizing Step 1 – Determine roof area to be drained. Questions? Call Us. ht tu wr am dq hb hd cy og dt