Cuts and bevels for common, hip, valley, jack, and purlin rafters. Hancock 0731647033, 9780731647033 hancocks roof books, 19 an easy to read handy pocket guide to roof construction, measurements and details. Includes result for hipvalley factor, slope factor and the roof slope in degrees. Calculations for roof frames, roof cuts and rafter lengths. Rating is available when the video has been rented. A carpenters framing square includes some tables stamped right into the tool itself. 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. M easure the rafter length along top edge of rafter. This book puts the answers right at your fingertips every length, every cut.
Well known throughout the industry as the little red roofing book, it can be or should be found in every roofers toolbox. Circular stairs, conventional rafters, round bays, all the calculations and tips are. Hes proclaimed for years that the best method for finding the correct lengths for hip rafters and laying out the back bevel angles, hip rafter side cut angle, was in the swansons blue book. Download roof cuts and rafter lengths, alexander webster. Plumb cut, typically called the ridge cut, at the top end of the rafter. The instructions outlined below show the stepbystep procedure to follow for basic roof construction. Roof cuts and rafter lengths by hancock boffins books. Birdsmouth, which consists of two cuts a horizontal seat cut and a vertical shoulder cut. To find the location of the rear lentil for the rafters, use a framing square. Now, when we turn to the 30 page in the rafter ready reckoner and when looking up the common rafter lengths, one of the things it tells us is. Like the hip rafter, it extends diagonally from the top plate to the ridge. 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. A series of tables giving the full length of all rafters for any span for 48 different pitches. Irwin rafter square reference guide complete instruction book.
Start your mark at pivot point, marking along top edge of square. Roof cuts and rafter lengths by hancock, 9780731647033, available at book depository with free delivery worldwide. Well known throughout the industry as the little red roofing book, it can be or should be found in the back of every roofers ute. The book is always available for reference and the smart phones calculator can be used to figure your rafter lengths right there on the job. Once you located where the mark falls on the 2 x 10, measure the distance and be sure to add 10 for the overhang. 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. Cuts are given with framing square layout and degree settings for cuts with skilsaws, and with degree settings for compound miter or radial arm saws. This gives the top plumb cut, to fit against ridge. Also cuts and bevels for gable and cornice mouldings, accompanying each of the 48 pitches with illustrations. Fulllength roof framer a series of tables giving the full length of all rafters for. This 88page pocket size edition is in metric, updating all the old calculations, and it is a very easy.
Shiften or swansons blue book richard birch and i are having a discussion on shiften. With the tape measure hooked onto the top end, transfer your two rafter lengths onto the top edge of the timber. Mark end plumb cut on the tail end of rafter using the. A series of tables giving the full length of all rafters for any span, for 48 different pitches. To the above determined lengths, add an allowance for the bottom plumb cut as well as the miter allowance if used, to get the overall. Obviously, when one has all the necessary rafter lengths written on the plans, the puzzle has been solved and it is time to arrange the rafter material on racks to mark layout for gang cutting. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak.
This calculator helps you make the rafters of the suitable sizes required for your roofing. Today, i use a calculator to find rafter lengths and angles. Hes proclaimed for years that the best method for finding the. How to calculate rafter lengths for gable, hip and valley. Cut one end of each 2 x 8 rafter to get the necessary length desired. On the framing square blade face, using the common rafter length per foot run line in the table, look along the blade under the inch number 18 we see 21. Roof cuts and rafter lengths hancocks 10th edition is a very popular, best selling book. Using the 7 inch rise table and our 15 run, the common rafter length is 17 43. The tail or eave overhang must be added to the rafter length.
Common rafter calculator rafter dimensions plumb cuts. Pivot s1uare to where number 5 on common scale lines up with same edge of rafter as pivot point. Roof pitch calculator calculates pitch, rafter length. This means that for every 1m the rafter travels horizontally, the angled length of the roof will be 1.
The part of the rafter that sits on the wall plate is known as the birds mouth. Roaddog and on a lighter note from a finish carpenter who cuts a roof now and then. Well known throughout the industry as the little red roofing book, it can be or should be. Add whatever length you want for a tail or eave to the rafter lengths given in the table in the back of the book. Use your roofing square set to the plumb cut to mark the plumb angles down from those points. Finding a valley rafter length example 5 on roof example illustration. Rise and run means that a 612 pitch roof has 6 of rise vertical for each foot of run horizontal. Layouts and degree settings are given for cuts that always give roof framers. Make the final decorativeedge cut using a template as before with a saw, touch.
Use the diagrams on this page as a reference when inputting rise and run, and while interpreting the calculated results. The picture below shows the first rafter lengths in green which is from the ridge to the wall plate. The plumb or ridge cut is made at the top of the rafter. Illustrated english hawkesbury city council library service. How to measure, cut and install rafters howtos diy. To determine the finished height of the ridge beam, add the rise.
Once you know the length of the rafter, how do you. An easy to read handy pocket guide to roof construction. Become a faster, more accurate, and more efficient roof framer with the rafter book. With rafter depth of 200 and birdsmouth depth of 29 the rise from top of wall to top high end of rafter 744. Books, images, historic newspapers, maps, archives and more. Rafter is a sloping beam usually wood that supports a pitched roof. Lets figure the rafter length for an 18 in 12 roof. 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. To determine the finished height of the ridge beam, add the rise m and the y height. The roof pitch calculator calculates slope, pitch, angle and rafter lengths, based on input of rise m and run r. It will help you with plumb and side cuts for hip and rafter, down and side purlin cuts and more.
Visit the roof framing page for more information on cutting roof rafters, and visit the roof pitch calculator for. The methods given for calculating the lengths of rafters, and for laying out and cutting them, are easy, accurate, and quick. Framing square rafter table guide how to figure roof rise. Complete instruction book and rafter length tables. How to use a rafter square the rafter square, or speed square, does more than mark perpendicular lines. Locate these rafter terms in the illustration below.
Improved methods for laying out and cutting hip and valley rafters are alone worth the price of the book. The article is titled common rafter framing not the definition of pitch. I would recommend buying this book along with the roof framers bible as a set. How to measure roof rafters including the pitch and birds. Tail cut, which may be cut plumb or square, depending on how the eaves are detailed.
If there is a noticeable gap, then it should be a red flag for investigation. Roof cuts and rafter lengths book, buy roof cuts and rafter lengths. Cuts and bevels for common, hip, valley, jack and purlin rafters. On the squared end of the purlin draw a plumbline, as at a b. This is the rafter length from the top cut to the seat plumb mark. A hip rafter is called for only when framing a hip roof, but a valley rafter is needed on both hip and gable roofs whenever roof planes intersect.
This valley will be the same length as the hip rafter for the 28. It looks like no matter whether i install the hips or commons first that i. Well known throughout the industry as the little red roofing book, it can be. Full lentgh roof framer is a book full of rafter cuts, sheating cuts,rafter lengths,info on irregular roofs, ect both the estimator and carpenter will find this book handy. Used by carpenters union apprenticeship programs from hawaii to new york. Calculate the length of a rafter from the roof slope ratio of inches per foot, and a building width measurement. Price new from used from hardcover, 1975 please retry. I can do it no problem for a regular hip, but this one has got me scratching my head. John, my biggest problem is that i dont know how to figure the hip rafter lengths for this roof. Jackrafter for hip or valley to be marked 12xg inch, or same as main rafte,r and 12x 512 inches, as shown on fig. To the above determined lengths, add an allowance for.
Measure back 57 to form plumbcuts, giving rafter top length of 2466. Then, use a pencil to trace the outside edge of the framing squares tongue. The roof framers field manual blue palmetto home inspection. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. 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. Having obtained the lengths of the first two adjacent jackrafters at the toe of the hip rafter, by the graphic or other method, measure the difference between their lengths, and keep adding this difference for the subsequent ones.539 1223 702 1366 1280 671 993 986 253 383 721 293 163 547 506 691 607 919 1112 473 1474 1066 68 1153 645 865 91 1081 1409 990 253 689 342 208 971 1135 879 717 58 953 138 393 1011 698 1405 957