2 A: Rob Haddock, a metal-roof consultant and director of the Metal Roof Advisory Group, responds: The culture of fastening through the ridge (crest) or through the valley of the metal-roof profile seems to vary in the continental U.S. from one place to the next, from one contractor to the next, and even from one manufacturer to … Add 12 inches to the length measurement for an overhang of 6 inches at each end of the roof's top and bottom. Measure the length and width in feet, then multiply together to find the … This would be handy when we fabricate our valley flashings. Measure the depth of the eave overhang from the edge of the roof, not the gutter, straight back to the outside wall. The amount of time that it will take will depend upon when they can start, what time of the year it is, and if they have a very busy schedule of their own. Determine the width of the metal you are installing. Measuring for a metal roof begins with getting a ladder. Answer. The final measurement for the calculation will be a length of 26 feet by 20 foot 6 inches wide. You also need to find out if they are available. If the eave is between 12 and 24 inches deep, multiply the roof-line … For trapezoidal roofs, measure the bottom edge, the top edge (also known as the “ridge”), and the … Add 2. For precision, the thickness of the ridge board and any eave overhang should be taken into account when determining the run. How to Repair Valleys on a Roof. Here is a quick overview of how you can measure a metal roof for your home that you can install either on your own, or have a professional do for you. To get started, I need to know only two things. Always try to measure from the ground first in order to keep yourself safe. Roof valleys are troughs that discard runoff water where two sections of sloped roof meet. You need to know how long it is, how wide, and what the pitch of the roof is going to be. Some roofers cut the shingles parallel to the flashing's center … Once you have done that, you will have a handful of businesses that you should consider using. Valleys. Regardless of the situation, it’s always nice to work with a professional that understands what to do and that’s what you get with a local roofer that can install this roof for you. About • Contact • *Disclosure Statement • Legal Statement • Privacy Policy. You will need to go up on top. You also need to be as accurate as possible so as to limit your costs. The hip and valley factor varies according to the slope of the roof, as shown in the table below. Determine Cuts. Use fasteners to attach the panel to the structure, making sure that there is complete compression of the sealant. An open valley relies on metal flashing for protection. 10’/2 = 5′so the run of the valleys is 5 linear feet. The next step is to compare the prices that they are charging for installing a new roof. Our host David Mackey discusses techniques used in installing Valley Panel using the SL-16 standing seam roofing system from American Building Components. Step 3 (Also see the Roof Pitch Multiplier Table.). In our example we will use 24-inch standing seam roofing, so we will divide 360 inches by 24, which equals 15. Step 3: Now, either fax that to 480-768-1514 or put it in PDF format and e-mail it to us using our online contact form . Since S2 is now a rectangle, simple L x W is all that is required. Have a question? A roof’s valley is very prone to leaks, especially if you have an older roof. Still, using metal for roof valleys has proven to be a popular choice among roofing experts. A roof's pitch is determined by how much it rises vertically for every foot it runs horizontally. Use our roof pitch calculator to find the pitch of your roof. In this type of valley the main roof is framed and sheathed as usual and the intersecting roof is framed on top of the main roof. The dormer's pitch should increase to match. In fact, it's 45 degress only if the roof is flat. If it is a substantial pitch to the roof, you are going to be looking at several problems such as maintaining your safety as you are putting the roof on. While the slope of the common rafters are expressed as “X-in-12”, the slope of the hip and valley rafter on the same roof will be “X-in-16.97”. To Calculate a Blind Valley Roof Select Blind Valley from the Roof Type dropdown list or select the corresponding button on … Some of them might be able to come out the same day that you call, or it might be a few days later. If the pitch of the roof is not that steep, you won’t have to worry too much about following. Now lets find the actual length of valley rafters. For many homeowners who are looking to install a metal roof on their house, cost is a huge factor. Find the dimensions of each of the roof’s faces. If you want to install a metal roof on your home, there are measurements that you will have to take. Divide the rise by the run (the run is 12). Click here for our new Roofing Forum! Remember that the heel cut, seat cut, and head cut for a hip and valley rafter will have angles that reflect this difference in slope. Once you have taken the measurements, you will know exactly how much metal roofing that you will need for the job. Divide the length of your roof by the width of the metal. If the roof has a triangular shape, stretch your tape measure along the bottom edge, then measure from the peak point down to the center of the bottom edge. As you can see, S1 and S3 are the same size, but you still need to document all measurement points to verify your material calculation accuracy. This roof valley is a perfect example. Only after getting the estimates from the roofing companies in your area can you make a determination as to who is going to save you the most money on this job. This is certainly not something that you should do on your own. You should do this with someone that can hold one end of the tape measure so you can go to the other ends. After they take the measurements, they can provide you with an estimate as to how much it is going to cost. Installing metal flashing for your roof project is a challenging but essential step to take to ensure that the new roof remains as weatherproof and as strong as possible.The following steps will explain how to install metal flashing in roof valleys. Find the square root of the result. Expressing the same thing using degrees: the roof sections in the above example have a 26.57° slope, while the hip or valley rafter will have a 19.47° slope. Some homeowners do not like the look of open valleys, while others feel the metal accentuates the roof’s shape, particularly if copper or painted flashing is used. Click Here. For example, you should consider working with a professional that can do all of the measurements for you. First of all, most people don’t have the time. As you can see from illustration the roof changes pitch at the porch from a 9/12 to a 3/12 pitch. The amount of money that you are going to spend can be minimized by working with a company that is going to do this for less. From your horizontal measurement (ridge), determine how many rows you will have (say 5.6 rows). It’s almost always a better idea to use a professional roofer if you are going to put a roof in your home. Low Slope Roofs (Slope less than 3:12) Use tape sealant between the valley trim and the panel. The easiest way to measure this section is to divide it up into three different sections: S1, S2, and S3. Corrugated metal is 36 inches wide. Square the result. This one is very good.*. To use this panel length calculator enter whole numbers and decimals only. For instance a 38" panel will have an … We plan to enable the use of fractions at a later time. Roof Online's Quick Reference Library - Click Here! Roof valleys are like gutters with a steep pitch, but the stakes are higher for valleys than they are for gutters. However, if you have gables, and small little areas that need to be measured, this could take a little bit of time. If you must climb onto the roof to measure the space, be sure to use caution. Thus, a moderate “6 in 12” roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Roof leaks are also very common in the winter, when all the snow accumulating on a roof … Visualize the rooftop rising to increase the pitch of the roof. By the way, pitch is measured by picking any point on the roof, place a level on it, measure 12” out from that point (this is called the run) and then down to the roof surface from the bottom of the level (this is called the rise) to see how many inches the roof … You can check businesses that rank local businesses and see what they are saying about this particular company. The cottage has a 7/12 pitch roof and the addition has a 6/12 pitch I now need to cut the old metal back at the intersection to build my valley jack rafters and to then sheath that new … If you have a basic roof, this is going to be easy. See Determining Roof Pitch. See The Best Roofing Tweets from Twitter! In this video, we’ll flash the valley. Asked by Dick August 24, 2016. The Blind Valley roof can be used to calculate valleys for roofs with unequal slopes. An unequally pitched valley rafter is laid out in the same way as the unequally pitched hip. The run of the valley is 5′ and the roof-slope factor for a 5 in 12 roof when multiplying by the run is 1.474. The first is the pitch of the roof. When the widths of the major and minor roofs are equal, two valley rafters of equal length will meet in the center at the ridge of the major roof. Then I use a construction calculator to find the correct length of each rafter. For a roof slope expressed as “X-in-12” (rise-in-run), the hip and valley factor is determined by finding the square root of ((rise/run)² + 2) for the slope of the adjacent roof sections. Roof Slope - Degrees to Roof Pitch (Rise-in-Run), One more thing: if you’re using this table, you should consider getting yourself a construction calculator. For example, standing seam metal roofing is 24 inches wide. Roof measurements are then used to quote any roofing job and completely eliminate the need to re-measure. For regular hips and valleys, where the roof sections have the same slope and meet to form a 90-degree angle:eval(ez_write_tag([[728,90],'roofonline_com-box-3','ezslot_1',112,'0','0'])); The hip and valley factor is a number that is multiplied by the actual run (horizontal distance) of a common rafter to determine the length of a hip or valley rafter. Then, for all of the smaller areas, you will then do the measurement in the same way and so you have a final total. To accurately calculate the area of your roof, you must first determine its slope, or pitch. It can also be used for such things as decorative false gables or chimney crickets. Also, read next about how to measure your roof pitch. Do The Job Right The First Time For contractors, this means all members of your team (sales, production, installation, etc.) Since it is the same size on both sides, you simply have to multiply that measurement by two. The hip and valley factor is a number that is multiplied by the actual run (horizontal distance) of a common rafter to determine the length of a hip or valley rafter. I am now building a 20 x15 foot addition intersection off the middle of the cottage. Measuring for a metal roof begins with getting a ladder. Measure the length of your roof line. In a previous video we covered how to flash roof edges before shingling. However, if you don’t have the time to do so, or if you lack experience, you can always find a professional roofer that can help you out. Step by step: First, clean the debris out of the valley, including sawdust, nails, and whatever … and the homeowner can be on the same page when it comes to the roofing job. Add another 6 inches to the overall width for an overhang of 3 inches for the sides of the roof. Add 2. Repeat the process on the other side of the hip, using the pitch of the hip for the secondary roof (9 5/8 / 18 13/16). I am in the roofing business, and for the life of me I cannot figure out how to calculate the compound angle created by one roof meeting another roof. Square the result. Finding and assessing these companies is very easy to do. The reason why the roof valley is such a vulnerable area of the roof has to do with all the rainwater and/or melting snow that accumulates and flows through the valley of the roof before draining into the gutters.. Find the answers to your questions about roofs and roofing. If you're referring to a dormer roof where two valleys meet from either side then you extend each to about a foot above the dormer peak meets the existing roof. As of 2020, the average price to install metal roofing is $5.97 to $9.85 per square foot. The heel height, overhang, and ridge and fascia boards for both roofs will be the same. Assuming that the dormer and the main roof have the same pitch, the valley between them looks like a 45 degree angle. Calculate the cost of the most popular metal roofs: - standing seam, - corrugated R-panels, - steel or aluminum shingles/shakes, - … We're going to use the 2 ft. square to calculate the angle for the valley panels. However, you need to cut down the middle of the valley so that one side lies … Divide the width by 2 and you have the run of the valleys. Measure a right triangle from the center of the valley at the bottom straight up to the ridge and over to the center of the valley at the top. On a related note, the pitch (properly the “slope”) of a hip or valley rafter will not be the same as the pitch of the adjacent roof sections. How to Seal Metal Roof Valley. How to figure metal roofing. “Provided the rest of the roofing shingles were properly installed and are performing properly, my experience has been that an open valley system holds up better over time,” says Jeff Tessaro of IKO roofing company . When the widths … Second, you may not have the experience necessary, or the tools that will be necessary in order to complete the job. Draw in a fireplace if you have one with its measurements and/or roof vents and the diameter of each one. If you have never used one before, then it’s obvious that you should contact a professional roofing company that can do this for you. Next, find the square footage of the metal roofing panels you want to use. First, measure the length and width of one section of the roof, then measure the distance the roof rises from the lowest point to the highest point. All rights reserved. Flashing should be installed in all of the valleys. Place the square against the rib of the panel that we have installed last and move it up until 17 intersects with the offset cleat. Do not cut them according to a template you have been using for the common rafters. I've made a market 17”, which is calculated by measuring from the inside of the female rib to the outside of the male rib. Repeat, the run, not the length, of a common rafter. If the eave overhang is 12 inches deep, multiply the roof-line measurement determined in Step 1 by 4. Metal can be very happy, therefore you are going to need some type of a crane to get everything to the top. This table provides the hip and valley factor for common roof pitches, as well as the underlying equation for the factor. Divide the rise by the run (the run is 12 ). Multiply the footprint square footage by the multiplier for your roof pitch to find the actual square footage of the roof. I have a 60x20' cottage with an existing metal roof. That flashing is left exposed, so the roof has visible lines of metal running down the valley. The main difference between the two is that valley rafters sit on inside corners, while hip rafters sit on … Copyright © 2014 - 2020, Roof Online. 1. Step 2: We need to know the roof pitch or the slope of the roof. You should do this with someone that can hold one end of the tape measure so you can go to the other ends. There is also the problem of getting all of the supplies to the top of the roof so that you can do the work while you are there. How do valley metal flashings join at top of valley? You will then measure how much it will be for the with all the way to the edge. For a roof slope expressed as “ X-in-12 ” (rise-in-run), the hip and valley factor is determined by finding the square root of ( (rise/run)² + 2) for the slope of the adjacent roof sections. Best practices for sealing the metal roof valley vary based on the slope of the roof. To understand the concept and how all the pieces are laid out and cut, I picture the roof two dimensionally, in plan view. So where two roof sections intersect to form a 90° angle (a regular hip or valley), and each roof section has, for example, a 6-in-12 slope, the hip or valley rafter at that intersection will have a slope of 6-in-16.97. Enter the diameter of the roof ridge vent gap (1"-3") Finally, enter the coverage area (width) of the panels you plan to buy. At this moment, we are stuck on how to bend our valley flashings for a 16:12 pitch roof. It’s going to take you a couple of hours to do all of this research. If the pitch of the roof is not that steep, you won’t have to worry too much about following. Thanks Bob You will need to go up on top. Consider working with a professional that can hold one end of the roof, not gutter. Use a construction calculator to find the correct length of 26 feet by 20 foot inches! Much about following to flash roof edges before shingling another 6 inches wide a to... For common roof pitches, as well as the underlying equation for the sides of the eave is. 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