## hip rafter angle formula

The length of the legs is the length of the common rafter. Jack rafter cut angle: 46.33 mm. So if your roof is a 45 degree angle (that is, for every 12ā³ along the horizontal (run), it rises 12ā³) itās a 12/12 pitch. Calculate hip rafter length using the distance formula; What is the minimum roof pitch for metal roofing? The first thing to do when working out the actual length of a common rafter is determine theĀ horizontal span of the rafterĀ as discussed in the previous page. Pitched Roof Rafter Lengths for Gable, Hip & Lean-to Roof construction How to calculate the length of Common Roof Rafters . When cutting the birds mouth it should only be cut into the roof rafter up to 1/4 of the timbers width (see the red marking on the image below). Length (with overhang): 494.77 mm. If it rises only 6ā³ for every 12ā³, itās a 6/12 pitch. HIP JACK RAFTER:A rafter that runs from the top of the wall plate to a hip rafter at 90Ā° to the wall plate (see Figures 1, 8 and 14). Hip Rafter Drop Formula for any regular hip drop is Ā½ hip thickness times the hip rise factor (16.97 Ć· rise). Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. To lay out my pattern (see illustration below), I first need to determine where the jackās long-point plumb cuts will meet the hip.For this I turn to my framing square (photos above).I use the ādifference in jack rafter length at 16 inches o.c.ā scale (photo, above middle) to arrive at an 18 1/2-inch on-center spacing for the long point on a 7:12 roof (photo, above right). That way you can completely finish all the cutting down on the bench before taking them up and installing them. Calculating the hip length is an important skill to have that will serve you well regardless of occupation. One expression of a hip roof pitch, based on this formula, would be 4:12, meaning a 4 ā¦ Hip roof is a roof with a sharp edge or edges from the ridge to the eaves where the two sides meet. The āriseā is the vertical measurement that indicates how tall the roof ā¦ This Slope and Skew Calculator makes it easy by performing all of the necessary trigonometry for each hanger condition in the roof. Tell us in the comments section below; 5 Things you probably didn't know about Carpentry Pencils, Top 10 Basic Carpentry Skills every newbie should master. For regular hips and valleys, where the roof sections have the same slope and meet to form a 90-degree angle:. To work out the second length of the rafter so that it runs past the brickwork and can have a fascia board fixed to it, we need to work out the overhang measurement. Roof pitch is often expressed as a ratio between rise and run in the form of x:12. Always use the same rafter as the patternĀ to ensure accuracy. The difference between the green span and the purple span below is the addition of the horizontal overhang shown above to allow a fixing for the fascia and soffit boards. Roof Framing Geometry: Trigonometric Formulas Geometrically Measure the distance between the corners of the eaves on one end of the house to obtain the span of the roof. The problem with two bevels though is they are easy to mix up and therefore make a mistake with and they can also move if knocked. It's also worth noting that the seat cut and plumb cut are always 90ĆĀ° from each other. HIP RAFTER MITER ANGLE arctan (cos Common Pitch Angle sin Common ā¦ Hip rafter length: ... Next, you will want to look for a hip roof angle calculator so that you can make sure all of your precision detailing for the roof itself is going to be spot on; getting things like the area and the angles right is going to be so important to doing this kind of job right. = 50.68286 Ā° = 90 Ā° ā angle between ridge and valley trough The Valley pitch angle for the combination of given pitches is 22.75711 Ā°. You don't need a framing square or rafters to calculate the rafter lengths, you can do it all on paper allowing you to calculate all the materials needed to price the job accurately just by knowing the size of the roof and the centres for the rafters. Before you can mark the rafter lengths and layout, check the camber of the timber. Or since the tangent of the Plumb Backing Angle is given by any of the following formulas you can use ā¦ Ā½ Hip Rafter Width Ć sin Backing Angle Ć· cos Common Slope Angle Ā½ Hip Rafter Width Ć tan Backing Angle Ć· cos Hip Slope Angle Ā½ Hip Rafter Width Ć tan Hip Slope Angle Ć· tan Plan Angle The other thing you'll need is theĀ roof pitch/angle. Rafters are generally provide in series, side by side, providing a plateform to support roof decks and roof coverings. This will ultimately define the width of the eaves soffit board as well, so it's important to know what you are going to use for that. of the hip rafter for this unit rise is 18.76". Now, when we turn to the 30ĆĀ° page in the rafter ready reckoner and when looking up the common rafter lengths, one of the things it tells us is; The length of rafter per meter of run is 1.1543. The hip roof framing calculator returns the value of the main rafter, the side rafter, the length of the hip, the height of the knee wall, and the lengths of the jack rafters. So if you know one, you can put a square on it to find the other. Marshall has a Bachelor of Science in biology and mathematics, with minors in chemistry and computer science, from Stephen F. Austin University. Use your roofing square set to the plumb cut to mark the plumb angles down from those points. Click the image to enlarge into a new window. For this example we'll assume the soffit will be 250mm deep. WHAT'S YOUR ANGLE? Assume this distance is 25 feet in this example. To obtain the actual length, the ridge board shortening allowance and the rafter tail It is used over brick external wall, wall plate, over two support and over top of beam. The span of the roof is 25 feet, so the run of the roof is 25 / 2 = 12.5 feet. Once we know any two angles in a given tetrahedron the rest of the angles automatically follow. Hip rafter length: Common rafter length: For many people, being able to get the right kind of hip roof calculator is very important, as knowing how to measure a hip roof is going to be vital to making sure that it turns out well. For example 8/12 on the common rafter but 8/17 on the hip and valleys. The calculation includes results for hip/valley factor, slope factor and the roof slope in degrees. Typically, this is shown on the roof construction plan in the approved building plans. Hip Jack Rafter: A rafter that runs from the top of the wall plate to the hip rafter, perpendicular to the wall plate cripple Jack Rafter: A rafter that runs from a hip rafter to a valley rafter, perpendicular to the roof ridge dormer Rafter: A rafter that sits on top of the main roof without cutting into the main roof. Hip Pitch Angle = arctan( tan (Pitch Angle) * sin ( Plan Angle)) ... Hip/Valley Rafter Backing Angle Chart in feet & inches. You can do this by using a string or chalk line to mark them. The dotted line is how the rafter length measurement is used, measure from the point at the top, down the length and plumb a line there. The "slideshow" shows a 90Ā° eave or ridge angle (or "wall" angle W ) but the development and trig will work regardless of the value of this angle. Roof Pitch Calculator Results Explained. The length from Step 4 was 13.6 feet, and the length from Step 5 was 12 feet, so the sum of their squares is 13.6^2 + 12^2 = 329 square feet. Like this: And thatās it! As you can see we have to multiply the run of the common rafter by the sq. For speed when cutting lots of rafters use a circular saw. This is a direct ratio of hip/valley rise & run to (Ā½ hip thickness = run) & (X = rise or drop). For example, if the ridge beam is 1.5 inches thick, subtract 3/4 of an inch from the overall rafter length. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. Therefore the span in not specified as in the case of the fascia angle formulas. Divide the span of the roof by two to obtain the run of the roof. For regular hips and valleys, where the roof sections have the same slope and meet to form a 90-degree angle:. The picture below shows the first rafter lengths in green which is from the ridge to the wall plate. With the saw bevel angle set to 45Ā°, cutting hips and creepers at the plumb cut angle will produce correct side angles. Place an angle finder against the underside of one of the rafters to obtain the angle of the roof. For example, if a room or section of a building is 20 feet long by 14 feet wide, the lower ends of opposing pairs of rafters attach perpendicular at the 20-foot-long walls, and the upper ends rise to a ridge above tā¦ The roof pitch should be specified on your technical drawings for the job, along with the sizes of the roof timbers. This online truss calculator will determine the all-in cost of your truss based on key inputs related to the pitch, width and overhang of your roof. Thickness: 5 mm. I then cut the long point of the shallow cheek cut angle on this line, flip the board, and cut the same line with the complimentary cheek cut angle (37Āŗ first then 53Āŗsecond). Here we consider two types of hipped roofs (see picture): 1) Pyramid hip roof ā the roof base is a square, roof sides are identical isosceles triangles 2) Hip roof ā the roof base is a rectangle, two sides are identical isosceles triangles and two sides are identical trapeziums. The plumb line along the valley created by the jack rafter is 90 Ā° ā 22.75711 Ā° = 67.24289 Ā°; this is also the Angle on the Compound Face of the jack rafter. With the saw bevel angle set to 45Ā°, cutting hips and creepers at the plumb cut angle will produce correct side angles. Depending on the size of the roof, most hip roofs will have 4-6 short jack rafters that are spaced out every 20 inches (51 cm) between the hip rafters and the king common rafters. First thing to do is to subtract the thickness of the ridgeĀ from the span of the roof so that the ridge will fit perfectly between the two common rafters. 5. I bought a copy of Goss's Roofing Ready Reckoner that a friend recommended for around ĆĀ£20. If you are using a Stanley Quick Square, move the blade to the corresponding notch for the hip rafter. Also, they will both add up to 90 (a right angle triangle is 90ĆĀ°). Marking the 8 will give you a plumb line; 17 a level line. There are minimum roof pitches many tiles like slates for example must be laid on in order to stay put and not leak. Hip to valley; Wall to hip; Hip to valley; The only method that is 100% foolproof to find the values for all jack rafters, no matter what the pitch or even if they are on different pitches is to physically measure the long rafter and the short rafter and then divide the difference by the number of spaces. Often, you express roof pitch as the ratio between the rise and the run in the form of x:12. As a do-it-yourself builder, you can expand your knowledge of basic roof construction by calculating the length of the rafters for a particular roof section or room. This will give us the span for each individual roof rafter: 3265 - 45 = 3220mm (total span less ridge thickness), 3220 / 2 = 1610mm (horizontal span each rafter will coverĀ and before meeting the ridge). Add these to the span we calculated before; Now we need to multiply that by the length in the ready reckoner which was 1.1543. The key to the whole thing is being able to visualize how the angles in this mockup relate to the angles found in the actual roof. There are two quick calculationsĀ to determine the two lengths as shown in the picture above. Click here for more tips on building gable roofs, Click here if you are building a hipped rafter roof, Click here for help with the fascia & soffit boards, Or here to go back to the main roofing page. The run of the roof in this example is 12.5 feet and the angle of the roof is 23 degrees, so the length of a common rafter is 12.5 / cosine 23 degrees = 13.6 feet. Hip rafter backing cut depth (amount of drop): 3.02 mm. Divide the span of the roof by two to obtain the run of the roof. Adding these two measurements to the original span (blue) will arrive at the total span for the second rafter length we need. How to Calculate a Roof Slope. Also it has to be cut to form a point, so to cut a hip raffter plumb cut you need to set the circular saw over so it will cut 45Ā°. If you are building an extension you will probably need to match it with the existing soffit size of the main building. Jack rafters run from the top of the structureās wall to the angled hip rafter, parallel to the common rafters. Unlike rafters for flat roofs, rafters for pitched gable and hip roofs rise at an angle from the outside walls and meet at a ridge. Cut the birds mouth with a circular saw and finish off with a handsaw if needed. Measure the distance between the corners of the eaves on one end of the house to obtain the span of the roof. The diagonal of a square = the length of one side x sq. So in that instance, I work out roughly what the overhang will be at each end of the roof and make sure the rafter tails are long enough to allow for that before cutting the rafters to length. 3. Sometimes it is easy to measure the width and divide it by 4. The Hip End Jacks tab displays a dimensioned side view and top view of the hip roof jack rafters for the hip end side of the hip rafter on an irregular hip roof. We'll cover the purple overhang separately and deal initially with the green triangle in the picture that takes the rafter to the wall plate. Development of the Compound Angle on the Jack Rafter Development of the Compound Angle on the Jack Purlin Development of Hip or Valley Rafter Side Cut Angles There is an order or heirarchy to these developments. Written on: July 14, 2020. The result from Step 6 was 329 feet, so the length of the hip rafter is the square root of 326 square feet, or 18.1 feet. All we do now is use a calculator to multiply 1.610 by the measurement in the book: So, the rafter lengths 1.86m long - Easy! Measure the horizontal distance from a corner of the eave to the end of the roof's ridge. Visualize line 6 as a common rafter, line 5 as a hip rafter, line 3 as the fascia, and line 2 as a ceiling joist. Divide the run of the roof by the cosine of the angle of the roof to obtain the length of a common rafter. If you are using a Stanley Quick Square, move the blade to the corresponding notch for the hip rafter. Hold the tape measure across the width of the timber and keeping the 'zero' end in place, pivot the other end of the tape round until the 8 inch mark meets the timber. Measure the distance between the corners of the eaves on one end of the house to obtain the span of the roof. Hold two rafters up in-situ and check they fit, if good cut the rest of the rafters you need ready to assemble. There are three terms to familiarise yourself with: A Plumb cutĀ - this is an angle to cut that will create a vertically 'plumb' line on the rafter, A Seat cutĀ is a horizontally level cut, so the rafter can sit flat onto the wall plate, A Birds mouthĀ is a combination of the two cuts made so the roof rafter sits tightly onto the wall platesĀ square edge. Hip rafter plumb cut. SQUARE CUT FASCIA: Hip Rafter Miter and Bevel Angle Formulas Miter and bevel are assumed to be cut from the side or plumb face of the Hip rafter. This saves a ton of time and trips up/down the ladder. The fastest way I've found to mark 1/4 of the width when it's not straight forward? You can see in the picture above where the two right angle trianglesĀ are that we use to make the calculations for our rafters. See Hip Cutting ā¦ For a better understanding of the calculation algorithm, consider, as an example, a hip roof of a house with sides of 8 and 12 m, and a ridge height of 2.5 m.The slope angle of the slopes is 35 Ā°, and the hip angle is 45 Ā°. A hip roof mockup cut from a scrap of 4x4 gives you all the pertinent angles, in 3D. Here is the online hip roof area calculator which helps you calculate the hip roof parameters such as roof rise, common and hip rafters length and roof area based on width, height of roof base and the roof pitch (identical for all sides). Solution of Irregular Hip Roof Plan Angle Formula An angle inscribed in a semi-circle is a right angle. To show how easy it is to use, let's imagine the roof has a 3.265m total span from outside to outside of the wall plates, the ridge is 45mm thick and the pitch is 30ĆĀ°. Usage of the Common Pitch Angle and Deck Angle is consistent for the Main Span and Adjacent Span. The final cut to make is the seat cut at the bottom. You can assess this in two ways, either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. A ready reckoner is pretty much a 'rafter length calculator' - a book full of tables for working out the rafter lengths quickly and easily. So if the plumb cut is 45, so is the seat cut. If the plumb cut is 30ĆĀ°, the seat cut must be 60ĆĀ° and so on. It is all well and good having these lengths, but how do they transfer onto the timber to create a roof rafter? If I'm cutting a roof where the wall plate or brickwork aren't perfectly straight/parallel it can be better to leave the rafter lengths too long and then cut them off after the roof is installed. Fig. A hip rafter is a rafter that runs from the end of a roof ridge to a corner of the eaves. The unit length multiplied by the total run in feet is the length of the hip rafter in inches (18.76" 5 93.8", or 7'-9 13ā16"). This calculator returns the first 16 jack rafters. Builder Construction Calculators: Hip Roof Framing Calculator. The drawings are representative of all of the hip end side jack rafters and do not include the overall lengths which are available on the Layout tab. The quadrilateral in plan, bounded by the eaves, Major Side Common Run and Minor Side Common Run, may be circumscribed. With the tape measure hooked onto the top end, transfer your two rafter lengths onto the top edge of the timber. Lengths of roofing timber almost always bow slightly. This theorem states that the length of a right triangle's hypotenuse is equal to the square root of the sum of the squares of the lengths of the triangle's other two sides. The angle at which the roof plane rises will account for a consistent height in inches above the 12-inch horizontal line, and is described as the nominator of the pitch calculation ratio. Slope - The slope of a roof is represented as X/12, where X is the number of inches in rise for every 12 inches of run.This is very useful information for many purposes, especially for roof framing - the slope, sometimes called pitch, is calibrated on speed squares.. Measure the rafter overhang. All the complicated trigonometry calculations are done for you, and there's loads more in there too, like diminishing jack measurements and hip rafter lengths and angles as well. If you are deciding yourself on the pitch make sure it is suitable for your roof covering. Since the rafter is "pushing" on the lower joint, it must also "push" on the apex joint (with 389 lb) to stay in equilibrium. Take for example, a rafter with a width of 175mm, or 7 inches. rt. Instances like that include things like sheds, dormers, timber framed and other structures where there's little chance of getting it wrong (or the walls being wavy). Determining the slope and skew angles related to hip and valley beams can be a challenge made even more difficult when the roof slopes on each side if the hip or valley are different. Hip/Valley Miter Bevel (Cheek Cut) Multiply the rafter thickness (o) side by the hip unit LL factor. of 2. 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. If you prefer to use the mathematical trigonometry method that you would have learned during school, the calculation for the hypotenuse/rafter size using the pitch and run of rafter can be found. Measure the distance between the angled hip rafter and the top of the wall at 20 in (51 cm) increments and cut jack rafters to fit. The formula Backing Angle = arctan (sin Hip-Valley Pitch Angle Ć· tan Plan Angle) will work for any roof configuration of irregular pitches, any angle between Hip eaves or Valley ridges. This will govern the height of your fascia boards, so it is often best to put two rafters up in place and check where you want that to fall so it is easy for you to construct the fascia and soffit section of the roof later. The bottom line represents the imaginary short point of the bevel cuts as well as the marks used to place the hip rafter. Common Rafter Pitch Angle or Common Rafter Plumb Cut Angle arctan (Pitch) or arctan (Rise Ć· Run) The initial values of Pitch Angles are generally given as Over 12 Angle in Plan or Deck Angle measured between the Hip eave and the Hip run, or the ridge viewed in plan and the Valley run. The hip rafter plumb cut is a different angle to a common rafter plumb cut. Hip roof. The Pythagorean theorem allows you to calculate the length of the hip rafter without measuring it directly, which requires you to climb onto the roof. of 2 (1.414) to get the run of the hip rafter. The underside of a rafter is typically available under the eaves of the house or in the attic. Hip Roof Area Calculator. Jack rafter depth: 15 mm. Lets assume for this example from the wall plate to the outside of the brickwork measures 300mm and the soffit size we want is 200mm. We need to hold a spirit level up vertically against the brickwork and measure from the wall plate to the brickwork as well (purple). Take the square root of the result from Step 6 to obtain the length of the hip rafter. Jack rafters layout (left side: ās5-s8, s9-s12, s21-s24, s29-32) Jack rafters layout (right side: ās1-s4, s13-s16, s17-s20, s25-28) Hip rafters layout; Common rafters layout; Roof battens, lath (hip end side) Roof battens, lath (main roof side) Wall plate or inferior purlin cut (corner connection) Roof covering materials layout (hip end) If youāre thinking about replacing your roof with a new one, you will need a roof truss calculator. A hip rafter is a rafter that runs from the end of a roof ridge to a corner of the eaves. Now mark 2 inches onto the timber, which is a 1/4 of 8 (alternatively if metric, hold 200mm across and mark where 50mm falls). W = Angle viewed in plan between Hip eaves or Valley ridges; any value greater than zero up to 180Ā°. Otherwise, if you are building new and will be using UPVC fascia and soffit you'll want to know the sizes that it's available in. This Slope and Skew Calculator makes it easy by performing all of the necessary trigonometry for each hanger condition in the roof. rt. Add the square of the result from Step 4 to the square of the result from Step 5 to obtain the square of the length of the hip rafter. These are used in almost every roof, including a gable end roof, lean to roof and hipped roof as well. Rafter runs from the ridge or hip of the roof to the wall plate of the external wall. Measure the distance between the angled hip rafter and the top of the wall at 20 in (51 cm) increments and cut jack rafters to fit. If you add an eaves overhang dimension, then the calculator will add the amount the rafter sticks passed the wall to the rafter length. 4. 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. So the second rafter length we need is 2.436 metres (round to the nearest mm). Assume for this example that this distance is 12 feet. If, for example, you want the rafter to overhang the edge of your building by 6 inches (15 cm), measure this now. Alternatively, measure the room or section of the building each way to determine which outside walls are longer than the walls at each end. When building a roof, in some instances I will work out the exact overhang needed for the fascia and soffit boards and add that to the rafter lengths already calculated. Starting Hint The run of the hip rafter is the hypotenuse of a right isosceles triangle. The picture below shows how these cuts are used to create the angles that help the timber form the shape of an angled roof rafter; You can see there are three plumb cuts, one at each end plus one for the birds-mouth. Length of roof rafters depending on climatic condition, style, slope and type of structure. Common Rafter Elevation If you are calculating rafter length from the center of the ridge beam (as shown below), you will need to subtract half of the thickness of the ridge beam from the top end of the rafter. You might need a long tape measure to get the span, then; (Total span - ridge) / 2 = individual rafter span. One expression of a hip roof pitch, based on this formula, would be 4:12, meaning a 4 ā¦ Occasionally a hip rafter cannot be dropped (because it is very thick) or part of it needs to be chamfered. Place an angle finder against the underside of one of the rafters to obtain the angle of the roof. Select the following information by using the drop downs to enter values in feet and inches. Determining the slope and skew angles related to hip and valley beams can be a challenge made even more difficult when the roof slopes on each side if the hip or valley are different. Each common rafter span is calculated by subtracting the thickness of the ridge from the total span, then dividing the answer by two. Pythagorean Theorem Find the run of a hip rafter if the run of the common rafter is 10 feet. Jack rafters (cripple rafter) Jack rafters spacing: 60 mm. Set Bevel Gauge. James Marshall began writing professionally in 2006. A hip rafter is a rafter that runs from the end of a roof ridge to a corner of the eaves. Hip to valley; Wall to hip; Hip to valley; The only method that is 100% foolproof to find the values for all jack rafters, no matter what the pitch or even if they are on different pitches is to physically measure the long rafter and the short rafter and then divide the difference by the number of spaces. It's better to make a ply jig (cut a plumb cut on an off-cut of ply or timber around 500mm long and a birds mouth, this can be used to quickly mark rafters once measurements have been applied) or use a roofing or framing square. Determine the direction the rafters rise from opposite outside walls to the ridge. Hip roof framing rafter cut angle template diagram: If using a Circular Saw or Compound Miter saw, set saw bevel angle to 45Ā° to obtain Creeper and Hip side angles. You are ready to set-out and cut theĀ common rafter lengths as soon as the wall plates have been squared, levelled and fixed (strapped) down onto the brickwork. Remember on a hip rafter we use 17 to mark the level cut. Then enter the value of the Run and choose the unit of measurement from the drop-down menu. Written by: Grant D. McKenzie. Plumb cut: A cut on a rafter or other angled framing member that will be plumb vertically when the member is installed. Keep the framing square in the position that it was set in to measure the birdsmouth cut. As in the case of common rafters, this is the theoretical length. Place an angle finder against the underside of one of the rafters to obtain the angle of the roof. In finding the length of the jack rafter, draw the common. Roof pitch is simply the slope created by the rafter. See Saw Miter and Blade Angle ā¦ Slide the framing square until the 6 in (15 cm) mark intersects the line youāve marked for the birdsmouth cut. the horizontal locating angle for hip and valleys for different combinations of roof slopes and intersecting angles. 84. The proper angle for water runoff on a flat roof ; Convert feet to meters manually; Install cedar shingles; HOMEPAGE HOME. That measurement though is horizontal from the end of the rafter to the brickwork (shown in green). Because the hip is generally 1 size wider than the jacks and commons, the seat cut must be deepened to bring the upper edge of the hip down to match the height above plate (HAP) of the jacks and commons. Assume for this example that the angle of the rafter is 23 degrees. Once happy, use one of those as a pattern to cut the rest with. Here are the steps to follow for the roof angle calculator: First, enter the value of the Rise and choose the unit of measurement from the drop-down menu. How do you calculate the length of roof rafters when building a roof? This calculator will help you estimate hip roof parameters, including rafters and roof area person_outline Anton schedule 2011-08-29 17:53:20 One of our users asked us to create a calculator that would help him estimate hip roof parameters, such as rafter lengths, roof rise and roof area. - Method of finding the Lengths of Jack Rafters. Dropping a hip lowers the heel of the hip rafters while backing a hip involves beveling the top edges of the hip rafters. Cutting roof rafters can be done as simply as with just a sharp hand saw and a bevel (or two to save setting them up twice) if that's all you have but it is both labour intensive and time consuming. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. If your walls and wall plate are all perfectly straight and square, you are probably safe to cut the complete rafters in one go on the ground and then take them all up and assemble the roof. You are ready to set-out and cut the common rafter lengths as soon as the wall plates have been squared, levelled and fixed (strapped) down onto the brickwork.

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