Hip roof framing calculator with rafter angle cutting templates and layout. If you are using a stanley quick square, move the blade to the corresponding notch for the hip rafter. Cuts and bevels for common, hip, valley, jack, and purlin rafters. I am considering building a small structure at my lake cabin that has a hip roof. To get the framing square setting for an irregular hip and valley rafter you have to know the mathematical height of ridge and the run of the hip in the same units of measurement. Hip roof area calculator calculate roof rise and area. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak. Choose which end of your rafter you want to be the top. View the irregular hip roof valley rafter framing blog for how to layout the hip rafter backing depth mark and the hip rafter side cut mark for hip rafter side cut angles. 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. 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 45. There is a scarcity of information relating to the solution of three dimensional angles as required for bevel corner angles for tapered bins, hoppers, chutes, towers, spires, masts and other tapered structures, and for hip and valley roof framing angles, and practically no prepared tables for ready reference. Horizontal span of rafter inches,run roof pitch inches rise, e.
The size of the ridge board and hip and valley rafters is prescribed as are the connections of these members. Hip unit rise run plan angle unit rise 2 hip drop adjustment material width. C7 inside valley angle in excess of 90 c8 full inside valley angle. Layouts and degree settings are given for cuts that always give roof framers. A ready reckoner is pretty much a rafter length calculator a book full of tables for. Cross multiply to get the plumb cut framing square setting. The amount of load carried by the valley depends upon the how the surrounding roof is is framed. Since both the hip and valley rafters run at a 45 angle to the common. Improved methods for laying out and cutting hip and valley rafters are alone worth the price of the book.
How to lay out a hip rafter explained by a holly hill sc. For plumb hip rafters, the hip rafter backing angle and roof sheathing angles define the cut on the timber. Use it to calculate pentagonal, hexagonal or octagonal roofs. Roof types, development of plan shapes and member positions are explained. Hip roof framing calculator with rafter angle cutting templates and setout. Thus, there are hip jack rafters and valley jack rafters. 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. The methods given for calculating the lengths of rafters, and for laying out and cutting them, are easy, accurate, and quick. Hip roof framing calculator accepts unequal rafter pitches. 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. For common rafters and jack rafters the planlength and the run of the rafters are the same.
Hip roof is a roof with a sharp edge or edges from the ridge to the eaves where the two sides meet. How to calculate rafter lengths for gable, hip and valley. You can use a framing table or website to calculate your rafter lengths. There is no problem in laying out these angles on the rafters as long as you keep in. Timber framing angles calculated from bartok, hawkindale, martindale and mckibbengray hip valley. A rafter extending from plate to hip rafter at right angles to the plate in plan view. 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. With the saw bevel angle set to 45, cutting hips and creepers at the plumb cut angle will produce correct side angles. Here is the reason you drop a hip and valley rafter if you look at where the hip touches the corner of the building you will see it has to move 12 the width of the hip towards the ridge to line up with the common seat cutso if the hip is 1 12 wide it would have to move 34 foward. Includes result for hip valley factor, slope factor and the roof slope in degrees. The rafter tools app has support for any roof eave angle from 30 to 180 as well as irregular hip roofs. Hip roof framing hip to common to ridge join diagram ply sheathing angle and cut setback both sheet orientations sheathing hip cut calculator hip roof ply cut angle diagram 18.
View the hip rafter roof plane alignment blog for more examples of the hip rafter plumb mark line shift on equal pitched roofs. This gives additional strength and allows extra width for nailing on the jacks. However, they should be 2 wider in their nominal dimension. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter. 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. We use volunteer labor to build and this book will cut our roofing costs by 50% just by making it easy for us to cut our own roofs without hiring contractors or buying trusses. Hip rafter layout a hip rafter is always cut from wider stock than the common rafter.
Here is the reason you drop a hip and valley rafter if you look at where the hip touches the corner of the building you will see it has to move 12 the width of the hip towards the ridge to line up with the common seat cutso if the hip is 1 12 wide it would have to move. 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. In this video i show you how to layout and cut hip and valley rafters. Wfcm has no definition for hip or valley, but it does for hip beam and valley beam. Exact lengths of all rafters including all regular and irregular hips, valleys, commons, and jacks. Center to center rafter spacing inches rafter thickness. Jan 09, 2020 mark the plumb cut at the top of the rafter. On a hip, the ridge cut is a little different from the commons because it must fit between two commons figure 3. All of the roof framing angles we use are based on these three angles. That ridges, and hip and valley rafters be sized as beams only for pitches of 3. 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. Rafter tools is an android app with functions to calculate complex roof framing angles that other roof framing calculators dont offer. 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. To use this rake wall calculator scroll left in rafter tools until the rake wall angles calculator is displayed.
How to layout and cut hip and valley roof rafters youtube. Hip and valley factor table this table provides the hip and valley factor for common roof pitches, as well as the underlying equation for the factor. The hip ends are triangular in shape and the sides have a trapezoid shape. Hip or valley rafter kindle edition by fred faridnia author format. How to do rafters in metric commons, hipsvalleys and.
Jul 02, 2012 see how the construction master pro contractor calculator s builtin rafter solution keys let you quickly and accurately calcul. Common plumb to plumb line length inches common line length ratio. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. A hip or a valley is where two roof slopes intersect, forming a peak or a depression. If a table of unit lengths of hip or valley per foot of run of common rafter is available, fig. Then, use a pencil to trace the outside edge of the framing squares tongue. See how the construction master 5 contractor calculators builtin right triangle solution keys let you quickly and. If you compare a like size, species and condition rafter from 802. Inch rise, run and the tables in the back of this book are all that are needed to layout rafter lengths and cuts for common, hip, valley and jack rafters. Holy grail rafter tools for android apps calculator. Roof framing calculations portland community college. Rakewall key finds the stud sizes based on entered right triangle values and the stored oncenter spacing. The diagram above depicts the crosssection of a typical prescriptive roof consisting of the rafters, a ridge board, ceiling joists and collar ties.
If you enter a value for the ridge board then half of this amount will be subtracted from the rafter length. Set the framing square on top of the rafter beam, with the tongue facing the top of the rafter. Hip valley miter bevel cheek cut multiply the rafter thickness o side by the hip unit ll factor. For example, a shed has a 312 pitch roof with a outside wall dimension of 10 feet. Hip roof framing rafter cut angle template diagram if using a circular saw or compound miter saw, set saw bevel angle to 45 to obtain creeper and hip side angles. Calculates the lengths of common rafters, jack rafters, and hip 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. Common rafters are shortened 12 the ridge thickness. 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. Segmental arches gothic arches lofting ellipses groin vaults hip rafter offset for hexagon and octagon roof framing roof framing polygon angles. Hip and valley rafters perhaps the sizing problems of hip and valley rafters is caused by misreading the code. Hip and valley roof compound angle formulas and geometry. This hip rake wall can be calculated using rafter tools, plan a calculator.
The plumb or ridge cut is made at the top of the rafter. First you need to calculate the hip rafter offset along the eave line. That is, if the run of the common rafter is 10 feet, the run of the hip rafter is the hypotenuse of a right triangle whose sides are 10 feet. It is used to identify the centre line positions for the purpose of calculating rafter set out length and the rise of the roof. 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.
They are also the same thickness as common rafters. Lots of illustrations and easytofollow example problems. Hip rafter valley rafter valley jack dormer a dormer rafter section b dormer rafter section all cuts on this roof can be made by using the appropriate inch rise number on the rafter square. To find the run of a hip rafter, find the diagonal of a square whose sides are equal to the run of the common rafter. Print full scale paper templates cut and fold over wood to mark and cut angles. Charts are helpful because the factors for hips and valleys are listed, which is useful for cutting rafters on the hip or valley. Select the following information by using the drop downs to enter values in feet and inches. Online tools for commercial and residential framing. Do not make the mistake of trying to multiply by the run of the hip or. Valley roof the valley roof option is used to calculate valleys for 90 degree intersecting roofs with equal slopes and wall plates at the same height. Also it has to be cut to form a point, so to cut a hip raffter plumb cut you need to. Irwin rafter square reference guide complete instruction book.
This slope and skew calculator makes it easy by performing all of the necessary trigonometry for each hanger condition in the roof. The heel height, overhang, and ridge and fascia boards for both roofs will be the same. 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 and valley roof compound angle formulas and geometry 11242007, 11.
Gives rafter runs to locate ridges and framing points. Then form a ratio of those number with the rise on top. Rafter run outer wall this should be measured starting from the center of the roof span, and then extending to the very edge of the exterior wall. This book saves your calculator batteries and reduces the roof to a series of arithmetic calculations. Hip and valley rafter sizing the building code forum.
A hip rafter is laid out just like a common rafter with a few twists. Span for the main rafters measure from outside of wall to outside of wall. See all formats and editions hide other formats and editions. The total rise of hip and valley rafters is the same as that of common rafters. The blind valley roof can be used to calculate valleys for roofs with unequal slopes. This app also displays the the hip, rafter, jack rafter and foot cuts and these can be transferred in the following ways simply scribe from your smart phone screen to you roofing materials. The structure will look a little bit like the one shown in figure 1 source, but with a steeper roof pitch. The layout of a hip rafter is the same in principle as the layout of a valley rafter.
The hip rafter plumb cut is a different angle to a common rafter plumb cut. For example, if you use 2 6 common rafters, use 2 8 hip. Today, i use a calculator to find rafter lengths and angles. A series of tables giving the full length of all rafters for any span for 48 different pitches. Hip roof framing calculator with rafter angle cutting. Plan angle unit rise tan plan angle hip unit rise run 12. There are a lots of ways of calculating the common rafter lengths and the hip valley rafter lengths. You can use a framing table or website to calculate your.
How to lay out a hip rafter explained by a holly hill sc home. How to do rafter calculations commons, hipsvalleys, jacks. The hip and valley factor is determined by finding the square root of riserun. Jack rafter calculator works with different pitches. Calculate the length of a rafter from the roof slope ratio of inches per foot, and a building width measurement. A hip roof is a rectangular roof that slopes on all four sides. The inclined rafters at either end of the ridge will brace the roof. This means that for every 1m the rafter travels horizontally, the angled length of the roof will be 1. Valley rafter a nomath approach to valley plates whether youre tying in new gable dormers or adding a chimney cricket during roof framing, giving the valley jacks a place to land is an easy task with these stepbystep instructions. Jul 09, 2017 how to layout and cut hip and valley roof rafters.
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