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HomeBuildHow To Build A Roof Truss Calculator

How To Build A Roof Truss Calculator

Major Differences Between Our Roof Calculators And Programs And Other Analogues

ROOF RAFTER CALCULATOR – Estimate Rafter Length, Cost and Quantity

There is no need to download construction calculators to your computer that is the main difference from many similar paid programs.

All necessary calculations are performed by using a carefully calibrated, complicated calculation algorithms. The results are presented in a comprehensible form .

The technical drawing of the roof will save a lot of time for creating a similar project of your own.

3D visualization of structural elements of the roof and rafter system, implemented in the calculator, is necessary for visual representation of the future structure. It goes without saying, that 3D visualization of the future structure is extremely important and helpful in the construction.

Theres one more indisputable advantage you can add website page with roof calculator of necessary type to your bookmarks in any browser and use it as you need. You can download the result of calculation in any possible format or print it.

Roof calculator online tool is performed on the basis of building standards, Building code and GOSTs adopted in Russia and worldwide, according to international practices of modern construction.

What Are Roof Trusses

Roof trusses use straight pieces of wood to form triangles, which then support heavy loads commonly. A roof truss bears the weight of the buildings roof. The parts of the triangles experience tension and compression, but they will not yield under the load.

Why are these so popular now?

Well, there are a few reasons. Most importantly, roof trusses are economical they use construction materials efficiently and allow for easy transportation and assembly, especially compared to other roof structuring options.

As you begin learning about roof trusses, youll find that the trusss structural height must be larger than the height of similar structures that use solid beams rather than triangles. This isnt a disadvantage, but rather another advantage. The size of the beams, and their angles, allow for excellent roof drainage and water tightness.

What A Roof Truss Calculator Does

A very basic online roof truss calculator requires the span of the roof , the pitch of the roof , and overlap as a measure in inches and sixteenths of an inch). For the person who is building their home for the first time, it might be a better option to order pre-made trusses.

Homebuilders need to know the roof span and whether or not there is a roof or attic mounted heating and air conditioning apparatus. The truss manufacturer needs to know whether the attic area will be used as living or storage space and the architectural details planned for the roof. Additionally, the contractor needs to communicate the number of windows and doors as a proportion to the total wall area. The other information required by the manufacturer includes the wind exposure category, the building category, the desired pitch of the roof, and the building plans. You better be sure of the roof truss calculator you need so to make sure you get a good return on your investment.

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Different Types Roof Truss

Bowstring roof trusses

Usually, bowstring trusses are large and arched. Just like aircraft hangars and warehouses buildings have a weight that is supported by the bowstring trusses of the roof. These types of buildings need little open space. With metal sheets or other materials for the outside roof, there are multiple beams that build an arch. From such types of roofs, water runs off easily. For other types of trusses, there is actually no need for a ridge cap.

Duel pitched trusses

The design of the standard triangular truss is like two sides slope up to the apex that is of the above along with the struts that are leading down from it. To make up the base of the triangle they are attached to a horizontal beam. Struts are also known as upper chords. These upper chords are of various lengths. It makes the off-center apex. For support, this allows plenty of unobstructed open space by poles.

Gambrel Trusses

In appearance, gambrel trusses are just like the barn roofs. Generally, there are two types of upper chords. One is longer than the other. Just like the dual pitch variety, they meet at the apex of the truss. There is sufficient space for the living room because of the steep sides. This can be used as an attic for storage purpose. To include an upper floor under the roof a gambrel roof truss allows this for your home. For large windows, there is also an extra room that has a brighter and attractive appearance inside the room.

Why is roof trusses needed?

Truss Form Existing Roof Dimension Calculator

Truss Calculator

To use the Truss Form Existing Roof Dimension Calculator:

  • Enter your existing heel size OR rafter size
  • Enter two of the Span/Height/Pitch fields. The tool will calculate the missing field.
  • Between calculations, click the field to clear or use the reset button to clear all fields
  • *This tool assumes roof with a central ridge position. This tool is intended a guide only. All measurements should be double checked by an experienced designer.01706 212 23801785 282 833Northern Office

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    Request A Calculation Or Quote Today

    With more than 75 years of combined experience in truss manufacturing, were quick to provide thorough, reliable pricing estimates. We promise to hide no costs, cut no corners, and leave no stone unturned when it comes to meeting your needs. All of our quotes also consider critical environmental factors, client needs, and fast turnaround times.

    At Hitek Truss Design, we provide calculations and estimates for:

    • Roof Trusses
    • Floor Trusses
    • Custom Truss Designs

    To begin building your roof truss quote, call or request a bid online. Were ready to start your journey to the perfect truss construction project in Hernando, citrus, Pasco, Sumter, Hillsborough, Polk, Marion, and Pinellas counties.

    What Is The Most Common Roof Truss

    A fink truss is the most common type of truss used, especially on homes and pedestrian buildings. The truss has an internal web configuration shaped like a W to give the ultimate strength to material ratio for spans from around 5m to around 9m in span which covers the majority of domestic dwelling being built today.

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    How Do You Measure Truss Size

    Youll typically need a buddy to help you measure truss size. Place two ladders at each end of the area youll be measuring. While your assistant holds the other end, pull a tape measure along the top plate of the house to determine the length and write down the measurement in feet. To determine the width, repeat the process on the width of the top plate.

    How To Calculate Rafter Length

    Steel Truss Calculation – The easy formulas you need to use

    This rafter length calculator lets you calculate roof truss dimensions using two slightly different sets of variables. It all comes down to what information you already have. Usually, that is either the pitch or the rise of the roof. What is more, the formula used to calculate roof truss dimensions is one you probably know very well – it’s the exact same formula you use to describe a right triangle – Pythagoras!

    The formulas we used are the following:

  • For calculations based on the roof rise:
  • rise² + run² = rafter length²,

    Meaning that:

    rafter length = .

  • For calculations based on the roof pitch:
  • The formula used to calculate rafter length from roof pitch is, in fact, the same as the one above. The one difference is that we need to calculate the roof rise using the pitch first. So what you need to do first is to get the pitch, using the following formula:

    rise / run = pitch,

    Expressed as a percentage, meaning that:

    rise = run * pitch.

    We can merge these two equations to get a single rafter length formula based on roof pitch:

    rafter length² = ² + run²

    rafter length = ² + run²)

    rafter length = run *

    If you’re unsure about the terms such as roof run and rise, refer to the illustration below:

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    Calculating Rafter Length From Pitch

    If you dont have the rise of the roof, you might know the pitch based on the manufacturers recommendations for the type of roofing you plan to use.Dont worry because that is still enough information to calculate the rafter length using a quick and simple ratio.

    Imagine the desired pitch is 4/12. This is equal to a right-angled triangle with a base of 12 inches and a rise of four inches. The length of the hypotenuse of this triangle is the square root of the equation a2 + b2 = 12 + 4 = 144 in + 16in = 12.65in. Because the length of the span and rafter are measured in feet, youll want to convert 12.65in to 1.06 ft. The length of the hypotenuse of this small triangle is therefore 1.06 ft.

    Suppose the base of your roof is measured as 40 feet. Now set up the following calculation: Base of triangle = base of roof. After plugging in the numbers, you get 1/40 = 1.06/x . Solving for x, you get x = = 42.4 feet.

    Now that you finally have the length of the rafter, you have two options for finding the rise. Take the time to set up a similar ratio or you can solve the Pythagorean Theorem equation. When you choose the second option, you know that the rise is equal to the square root of c squared a squared, where c is the rafter length and a is the span. This means the rise equals root 40 ) = root 1797.8 1600) = 14.06 feet.

    How To Use Our Roof Truss Design Calculator

    Wondering how to achieve that perfect roof truss design in your home – and how much it will cost?

    Our roof truss design calculator will help you determine some of the details, including dimensions and basic principles of construction. Take a look below to find a starting point for your roof truss budget.

    An important note: Every truss calculation will be completely unique based on your roofs specific size and dimensions. Its vital that you use your exact measurement rather than estimates from other projects or homeowners.

    Our handy roof truss design calculator calculates the rake length of your roof by using the span, overhang, and pitch measurements.

    • Pitch This is the incline of the roof. It will be expressed as a fraction. If you think back to your early geometry classes, you might remember that the pitch of a triangle is the rise over the run.
    • Span This is based on the total footprint of the house and the distance between two exterior walls.
    • Overhang This is the part of the roof that extends beyond the exterior wall of the home.

    Simply enter the measurements and our handy tool will calculate your rake length instantly.

    Our truss calculator computes the best dimensional method to connect the pieces of the truss. This will be done with steel joints and a bridge, added to support the weight of the entire truss.

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    What Dimensions Do You Need

    This is where our expertise comes into play. The average roof truss project costs between $7,200 and $12,000 and much of that price discrepancy comes from the number of materials used and, therefore, the projects dimensions.

    To help you out, weve created a handy tool that calculates the rake length of your roof. In other words, this roof truss calculator uses the span, overhang, and pitch dimensions to calculate a rake length. Using this information, you can better estimate how much the roof truss design will cost and what materials you will need.

    Common Roof Trusses: Everything You Need To Know


    Roof trusses have overtaken rafters as the most popular way to create a roof frame. And theres good reason why trusses have become more popular – theyre cheaper, more convenient, and extremely versatile.

    In this article, we break down what exactly roof trusses are and explain some of the most common types used in order to help you get insight into what kind of roof trusses you may want to use for your roof construction project.

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    Just Enter The Dimensions And Get An Accurate Calculations Of The Roof

    User is not required to have any knowledge in construction or to think about how to calculate the roof for better cost avoidance.

    You just need to enter properly the basic measured parameters and to select type of roof material and type of roof.

    All calculations, such as calculating the area of roof, the length of rafters or the number of purlins – all this information will be presented just in few seconds.

    How To Build Roof Trusses For A Shed

    The roof trusses for sheds are one of the most vital pieces to design. These consist of 2 rafters that will hold up the structures roof. Once completed, the roof trusses are installed and lifted onto the top part of shed frames.

    The trusses you require may depend upon the sheds length. The longer your shed is, the more roof trusses you will have to make. The good thing about roof trusses is that they are simple to construct.

    Step #1

    Begin by determining the measurements of the roofs slope. This will be the rafters length. If your roof has a long slope on one of the sheds side, one of your rafters should be longer.

    So, know the number of the roof trusses youll need, then double the number for you to acquire the number of the rafters youll need when building the roof trusses.

    Step #2

    Cut the rafters from 2×4 piece of wood. Cut it to the length you require and add the plumb cut to its ends. This plumb cut should be a 45-degree angle cut.

    Step #3

    Cut the bottom cord of the roof trusses.

    Step #4

    Make the gussets, which are the half-inch thick plywood pieces that will cover the 3 ends of the roof trusses.

    Step #5

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    Roof Trusses Are Convenient And Reliable

    Weve listed out six of the most common roof trusses, but there are many more types on the market. From metal roofs, to asphalt shingles, to vaulted ceilings and flat roofs, there is likely a truss that can help you get the job done.

    Roof trusses are versatile, cost-effective, and convenient. Working with an experienced architect or structural engineer is the best way to guarantee that youll find the right trusses for your home and meet your building code requirements.

    Information Needed For The Roof Truss Calculator

    Truss Calculation

    Consideration of the use of the space underneath the roof is necessary as some types of truss allow for significant attic or storage space, such as the gambrel truss, which is commonly found in structures with lofts. Other types of trusses, for example, the scissor truss, allow for no attic space. Prior to the use of a roof truss calculator, many of which are available online or at your local roof truss manufacturer, one must know the type of truss that is going to be constructed. Each different type of truss requires different measurements for entry into the roof truss calculator.

    Once a design or type of roof truss has been chosen, it is time to come up with the measurements needed to build or purchase the trusses. The first step is to measure the length and width of the building. Next, the wall height and roof pitch need to be determined. Finally, measure the gable overhang and the eave overhang. These calculations can then be entered into a roof truss calculator to obtain the data needed for the construction project.

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    How To Calculate Truss Count And Roof Truss Cost

    As you know, you can use this tool for more than just figuring out rafter length and other truss dimensions! Our roof truss calculator can also help you plan out your roof project by estimating the truss count, showing you expected cost of the materials, and finding the installation cost. So, to answer the question “How many trusses do I need?”, it uses the following equations:

    • truss count = /24) + 1,

    Rounded up to the closest whole number .

    To calculate the costs, we use the following two formulas:

    Including installation costs:

    • total costs = truss count * single truss price + cost per time unit of work * duration of work

    Excluding installation costs:

    • total costs = truss count * single truss price

    If you’re unsure about the terms such as the on-center spacing, refer to the illustrations below:

    Roof Framing Is Not As Hard As It Looks

    Image source: The Spruce

    The whole process is rather complicated, but when you break down designing, measuring, cutting, and hammering everything together into small, digestible parts, framing a roof can be DIY.

    Of course, this guide merely scratches the surface of roof framing. We don’t get into the nitty-gritty of building codes, gable studs, and roof sheathing. However, these fundamentals ideally provide a solid foundation for a gung ho roof framer.

    Keep in mind that you can skip most of these steps by opting for pre-fabricated trusses. For those who would rather not spend on delivery, recruit additional labor for installation, and seek to hone the waning craft of roof framing, rafters are the way to go.

    With enough experience, framing even a complex hip roof with hip rafters, jack rafters, and the like should come somewhat intuitively.

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    What Is Roof Truss

    During construction or renovation usually, roof trusses are fabricated from wood and frame house roofs. To construct the rest of the roof there are different types of trusses to support all the other materials. They provide support and distribute the load to the exterior walls. There are different types of trusses that are commonly used.


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