Having fixed the rise and run by the square for the common rafter, take 17 in. This menu option allows you to set the width of the hip rafter. This is because hip rafters rise from the corners of the building at a 45 degree angle diagonal. These roof framing books were written to make complex roof framing simple. The hip roof framing calculator returns the main rafter, the side rafter, the length of the hip, and the lengths of the jack rafters. A regular hip has equal slopes on all sides while an irregular hip has different slopes on the main roof and hip end roof. How to determine hip ridge length and wall layout blue. Hip roof framing calculator with rafter angle cutting templates and setout plans metric. From your average hip roof calculator to something more specific like a hip roof rafter calculator, there is plenty to consider with this kind of calculation. To get results you need to provide roof base dimensions length and width and roof pitch we assume it is identical for all sides. The complete pocket reference to roof framing 2nd edition. In this article, we also have a lot of pics usable. Hip valley line length inches hip valley line length ratio jack step down each rafter. When you first calculate the offsets for the hip and valley you get all the information you need.
This section is from the book hicks builders guide. Rafter span tables use these tables to determine lengths, sizes and spacing of rafters based on a variety of factors such as, species, load, grade, spacing and pitch. Unequal pitch roof trigonometry calculating unequal pitched roofs is easy if you know what trigonometry functions to use. How to lay out a hip rafter explained by a holly hill sc home. For larger roofs though, i use a roofing ready reckoner. You can use it as a simple equal pitched gable rafter calculator or use it to calculate unequal pitched gable roofs with unequal plate heights. Beveling unequal valley and hip rafters fine homebuilding. These hip rafters run at a 45 angle from each corner of. One theory ridge line for all roofs that take into account different pitches, rafter width, seat cut hap change in sectional dimensions of sheeting due to pitch, different spans and different wall heightsand only enough tjis to cut one span. The rafter tools app irregular hip rafter function calculates the correct king common rafter length for unequal pitched hip rafter roofs. The octagon roof framing 4 butt hip rafter method calculator will calculate the rafter lengths for the octagon 4 butt hip rafter method. Timber porn and it pretty much stayed a porn book on stereotomy geometry until i read through. This slope and skew calculator makes it easy by performing all of the necessary trigonometry for each hanger condition in the roof. Measure or calculate the horizontal distance the rafter.
If youre framing a gable roof on a new house, or building a shed or even a doghouse with a gable roof, youll need to cut a number of roof rafters. Let me explain a hip rafter rises from the corner of a building at a 45 degree angle and if the carpenters used the same hap on that rafter as he did the commons the corner of the rafter would rise up above the plane of the roof causing a hump. You can use the old layout method or a calculator to do this. The image at left shows a hip rafter with a run of 4 8 12 the span. Today, i use a calculator to find rafter lengths and angles. Unequal pitched gable rafters with unequal plate heights. Hip roof framing hip to common to ridge join diagram. It builds on knowledge and skills acquired during basic roof framing.
The subtle though important issues about hip valley placement that youve highlighted in our ongoing dialog on the tale of two pitches saga have inspired me to follow your suggestion to do a follow up post showing the offset method of framing an offangle hip roof system. Rafter tools for android apps calculator octagon roof framing. 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. There are two parts to the text, part 1 hip and valley roofs and part 2 broken hip and valley roofs, which address the following.
Side or cheek cuts for valley, hip or jacks are determined according to principles developed in sec. Use our online rafter length calculator to quickly compute the length of the shed roof rafter by entering the measurements of overhead, length of roof span, pitch or angle. Height above plate hap hip rafter calculator sbe builders. To obtain the actual length, the ridge board shortening allowance and the rafter tail.
Unequal pitched tables chappell universal square first. A rafter that runs diagonally from the top of the wall plate to the roof. Irregular hip framing formulas variables major pitch minor pitch major run jack rafter spacing formulas eave. Valley jack rafters run roofs, but they are quite rare and require special framing from the valley rafters to both ridges. The blind valley roof can be used to calculate valleys for roofs with unequal slopes. Hip rafter backing offset main perpendicular to hip rafter run line. How to measure roof rafters including the pitch and birds mouth seat cuts captioned duration. B unequal pitched rafter tables for the first time the history of the framing square, the chappell universal metric square provides comprehensive unequal pitched rafter tables that include. Stair tangent for iphone this iphone app is for rough frame carpenters that dont build stairs everyday, but could use an stair app calculator to check their stair building calculations. Values may differ slightly from those determined by the pythagorean theorem and proportion. Print full scale paper templates cut and fold over wood to mark and cut angles. The plumb cut or down bevel is the same as that of the common rafter on the long side of the hip, shown at d on the line a d. With the rafter tools android app youll be able to.
This hip rake wall can be calculated using rafter tools, plan a calculator. A bevel set in the angle where they join the hip line f b will give the bevel across the back. Hip rafter drop for roof plane alignment equal pitched roofs only. The heel height, overhang, and ridge and fascia boards for both roofs will be the same. Jan 29, 2020 devers hip rafter canted hip rafter, top edge of hip rafter rotated into the roof surface plane. This will be the second of a series of three videos if. If you are making repairs to your roof or installing a completely new roof, you will need a rafter calculator to help you figure out rafter lengths.
The difference is that well use 17 instead of 12 to lay out the hip. I have referred to this book for years and it hasnt failed me yet. Hip valley cripple jack rafters are placed between the valley and hip rafters. To find the cut of the hip rafter set off on the perpendicular the run of the common rafter on the short side of hip c a. Deduct half the thickness of the ridge from the span length this length is the correct measurement from the top plumb line to the birdsmouth plumb line. Hip and valley pitch in inches of rise per unit of run. Visit the roof framing page for more information on cutting roof rafters, and visit the roof pitch calculator for determining rafter lengths based on rise and run. Rafter line length calculator deduct half the thickness of the ridge from the span length this length is the correct measurement from the top plumb line to the birdsmouth plumb line. One of users asked us to create calculator which will help him estimate hip roof parameters, like rafter s lengths, roof rise and roof area. The long hand math, even with a calculator or rafter tables, was mind numbing to tie it all. A ready reckoner is pretty much a rafter length calculator a book full of tables for working out the rafter lengths quickly and easily. 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. In this video i show you how to layout and cut hip and valley rafters.
The unequal pitched gable rafters is a very useful tool in roof framing. I would like to know how figure the pitch, length and offset of the hip on an unequal pitch hip roof i am cureently framing a hip roof and the plans call for an 11inch pitch on two sides a 7. When you have rafters of unequal pitch meet at a hip or valley, and assuming you are aligning the tops of the rafters with the top of the hip or valley, the bottoms of the rafters will be at different heights. To remove this center ridge piece, you can lengthen 2 only opposing common rafters by and butt their tops together in the center. Unequal pitch roofs are hard enough to design and when you add equal overhang you have really kicked it up a notch. Height above plate matching rafter calculator height above plate rafter calculator height above plate hip rafter calculator with equal or unequal pitchs bowed bay window rafter calculator with unequal overhang runs circular tower structural ring rafter calculator octagon tower structural ring rafter calculator. 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. Hip and valley roofing building inspections brisbane qbis. Unequal pitched gable rafters with unequal plate heights you can use it as a simple equal pitched gable rafter calculator or use it to calculate unequal pitched gable roofs with unequal plate heights. Rafter tools is an android app with functions to calculate complex roof framing angles that other roof framing calculators cant and dont offer. How to lay out a hip rafter explained by a holly hill sc home inspector. The dimensions and angles in the sketch below were solved using the online calculator. Shows how to frame any type of roof in common use today, even if youve never framed a roof before. View the hip rafter offset blog for more examples of the hip rafter offset line on unequal pitched roofs.
In this video i will look at how to calculate the length of the ridge on a simple hip roof. Such as png, jpg, animated gifs, pic art, logo, black and white, transparent, etc about home plans. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. Ply sheathing angle and cut setback both sheet orientations sheathing hip cut calculator hip roof ply cut angle diagram 18. Includes using a pocket calculator to figure any common, hip, valley, or jack rafter length in seconds. How to layout and cut hip and valley roof rafters youtube. The pitch of the unequal hip rafter can be expressed in relation to either the main roof or the secondary roof.
Hip and valley roofing the text provides subject matter related to more detailed hip and valley roofs. It is perhaps one of the simplest styles of roofing, and is often combined with gables or other. Once youve temporarily supported the ridges with a few common rafters, you can lay out the hip rafter. Includes result for hip valley factor, slope factor and the roof slope in degrees. The chappell universal square provides for the first time, comprehensive unequal pitched tables that include. With one number on our square you can frame a roof or a solar panel support, or layout stairs, cabinets, trim work, or many other construction projects. To do this, your best bet is definitely finding a good hip roof construction calculator so that you can work it all out in a timely and simple fashion. Valley rafters valley rafters run at a 45 angle to the outside walls of the building. Easy rafters does not calculate a complete four sided hip roof, but rather calculates the common, hip, and jack rafters for one end of a hip roof. Hip roof calculator hip roof calculator you searching for is available for you on this website. An intersecting roof with unequal spans requires a supporting valley rafter to run from the inside.
Hip roof is a roof with a sharp edge or edges from the ridge to the eaves where the two sides meet. As in the case of common rafters, this is the theoretical length. Rise and run means that a 612 pitch roof has 6 of rise vertical for each foot of run horizontal. Online tools for commercial and residential framing. Hip roof framing rafter cut angle template diagram. Hip rafter backing offset adjacent perpendicular to hip rafter run line. A hip rafter is laid out just like a common rafter with a few twists. This calculator will help you estimate hip roof parameters, including rafters and roof area. Speed the job of rafter or angle layout by using our rafter angle square. Since the angle of intersection changes with every change of pitch, it is hardly worth while developing a constant to be used on the tongue in framing hip and valley rafters on irregular pitches. The examples in this article use the same rafter lengths described in that earlier piece those required for a standard 812 hip roof on a 22x57foot building. If the hip is not backed this is the amount to lower the seatcut of the hip to have the corner edge of the hip plane in with the sheathing common rafter ll major side majll. Any roof which has 4 sides, all of which slope upwards to meet at a seam at the top of the roof, is a hip roof.
Both the common rafter and the hip rafter will have the same run using the layout method. Hip roof framing calculator with rafter angle cutting. A sketchup model helps clarify how various rafters and framing components are assembled in an off angle hip and valley configuration. Once you know the appropriate lengths, you will be able to determine the total cost of your roof project. Enter the value for the roof width outside to outside in feet, inches, and fraction, inches and fraction, or use the inches box to enter a value in decimals if. Enter the value for the roof width outside to outside in feet, inches, and fraction, inches and fraction, or use the inches box to enter a value in decimals if that is your preference. Jul 09, 2017 how to layout and cut hip and valley roof rafters doublewide6 repairs llc. The roof rafters provide integral structural support to the roof. Lay device on incline and hit start measuring to directly measure pitch. How do you figure the length and angles of the cuts on an uneven roof for the hip rafter reply. B f shows hip rafter in position for finding the length and bevel of the jacks on the long side of the hip.
Common rafter length spreadsheet framing contractor talk. A valley rafter follows the line of intersection between a mainroof surface and a gableroof addition or a. Hip roof area calculator calculate roof rise and area. For example, in an equal hip roof with an 8 12 pitch, the pitch of the hip rafter would be 8 17. The unit length multiplied by the total run in feet is the length of the hip rafter in inches 18. To calculate the length of a hip rafter, multiply the unit length by the number of feet in the total run of a common rafter. Our square has a handy 6 rule for quick measurements and scribing. Bastard hip common run equalunequal overhang collapse. With a square roof, the ridge becomes a square center piece kingpost with side lengths equal to common rafter thickness.
The formulas below use the law of sines to calculate the unknown length or angle. Calculating common rafters with a construction calculator is fairly easy, but to be a master carpenter you need more roof framing angle information then the construction calculators offers. Hip valley rafter roof angles for equal and unequal roof pitches for any. A hip roof is a rectangular roof that slopes on all four sides. The correct way to calculate the minor pitch king common rafter. This is the horizontal distance measured between the outside face of the wall frame, for a. To make the overhang come out equal to the regular pitch side which is usually the front and back hip you simply have to raise the irregular hip roof side to match. Hip roof framing calculator accepts unequal rafter pitches. Each page has a different table depending on the pitch angle of your roof with all the figures you need. This height above plate rafter script calculator will return the h.
Hip roof framing calculator with rafter angle cutting templates and setout. Complete instruction book and rafter length tables. Irregularunequal pitch hip roofs with equal overhangs. Select the following information by using the drop downs to enter values in feet and inches. If the hip is not backed this is the amount to lower the seatcut of the hip to have the corner edge of the hip plane in with the sheathing common rafter ll major side majll majspan majllratio. But here it will be different, since the hip rafter doesnt lie at 45 degrees to the commons. How to lay out a hip rafter explained by a holly hill sc. All of the roof framing functions are case studies from my book holy grail of roof. I have been reading will holladays book on this subject and im still very confused. This calculator helps you make the rafters of the suitable sizes required for your roofing. The reason i asked if easy rafter will calculate the unequal overhangs is for the placement of the hip and to figure the pitch of the hip so that the top of the hip will plane in with both the 11incg pitch side and the 7. To do this, your best bet is definitely finding a good hip roof construction calculator so that you can work it all out in a. Mar 22, 2017 how to calculate unequal slope rafters. For a good straight fascia, add an extra inch or 2 to the tails of all your rafters total.
Consequently, they are the same length as the hip rafters. If you can find the book residential carpentry by john capatosto, you will be able to find all the step methods needed for cutting rafters, including shortening the rafter for the width of the ridge, both common and hip. To get results you need to provide roof base dimensions. View the hip rafter plumb mark line shift blog for more examples of the hip rafter plumb mark line shift on unequal pitched roofs. Billy hope this helps you construction master pro calculator example building is 30. Rafter is a sloping beam usually wood that supports a pitched roof.
How to calculate rafter lengths for gable, hip and valley. Explore framing complexities that result when roofs of two different pitches intersect. Calculating rafter length starts with a few basic inputs that you will need to gather. Calculate the length of a rafter from the roof slope ratio of inches per foot, and a building width measurement. Our roof rafter calculator tools are handy for calculating the number of rafters needed, rafter length calculator, lineal feet of rafter, board feed in ridge and subfacia,and the total board feet in the roof. Stair tangent for iphone this iphone app is for rough frame carpenters that dont build stairs everyday, but could use an stair app calculator to. Online tools for commercial and residential framing sbe builders. Span for the main rafters measure from outside of wall to outside of wall. Once again, the construction master serves as an indispensable tool for figuring each rafter cut. Can they still layout and cut a hip rafter without the use of these tools. Nov 09, 2012 i have a hip roof with a 1212 pitch on the main side of the roof while the end is an 1812 pitch. The saint andrew cross purlin rafters need to be laid out using the draw down roof surface method.