It would be really cool to see another SU Demo showing how to draw in SketchUp an Irregular H/V Roof with the proportionate offset and square shouldered H/V Rafters. . The valley rafter was as you said close enough according to the string level and square. How do I make it seamless? Start your subscription today and save up to 70%. Elegant rustic christmas decor with fir branches, white roses, a candle lantern. See if it reminds you of your brother's formula that you lost.Let URL = the Unit Rise of the lower pitch roofLet URH = the Unit Rise of the higher pitched roofThen the Unit Rise of the Hip or Valley is equal to= (.7071 x URL x URH)/sqrt( (URL)+ (URH) - 1.4142 x URL x URH)In you example, URL = 6 and URH = 9Substituting these unit rises into the formula, we getUnit Rise of Hip/Val = (.7071 x 6 x 9)/sqrt(36 + 81 - 1.4142 x 54) = 5.99Therefore, the Pitch of the hip or valley would be 5.99/12, or for all practical purposes, 6/12.Does that look familiar? JavaScript is disabled. Why stand around on the jobsite scratching your head when you can cut an entire virtual roof in the comfort of your own home.The true power of Sketchup is revealed when you can cut an entire complex roof system on the ground then hoist it all upstairs for a perfect fit (lumber inconsistencies aside). I am going to sit down with it and do some paper work on it as I am dying to know it inside out. Another option would be to raise the current kitchen roof to match the new roof, but as it joins the neighbours roof, we would have to just raise our side and somehow join it to the neighbours lower one. On the other hand, you can opt for cemented roof patterns which are covered by other roofing material. You can install a shallow pitched roof over your existing flat roof, add a trussed ranch-style roof to convert to cathedral walls, or even build a new floor and install the pitched roof above that. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. June 18, 2019, 10:35 am. Do not sell or share my personal information. In an effort to make the formula easier for the average guy to use, I eliminated it by expressing it as .7071 instead, as a factor in the numerator of the fraction.In other words, 1/square root(2)= 1/1.4142= .7071As far as the shortening and setback go for the cut at the top of the hip or valley, let me say this. Hopefully by that time I'll have learned enough about the process to post a viable follow up. Do not include the sheathing thickness, that should be part of the overall overhang dimension, as that is how rafter lengths should be calculated from.). *Jim,First, I want you to get the hips and valleys at the 90 corners correctly cut.The plumb cut on the hips and valleys is 5/12, not 5 3/4 /12. Brejnik team consists of qualified and trusted: Architects, Interior Designers, Appraisers / Lenders, Trades & Suppliers, Geo-technical engineers, Structural Engineers, Arborists, Landscape Architects, Pool & Water Feature. Dictionary of architecture and building construction. Hooking trusses or rafters that are already in location on a 24\" layout, makes sure you don't end up with problems when sheathing.5:21 - 6:15 Pulling numbers for rafter numbers.All of my numbers were pulled from long-point of the 63* on a 45* to long-point of the 6/12 head cut at the top of the ridge. If the 2 roof pitches involved were both the same, then the hip would bisect the corner angle, forming two equal 67 1/2 angles with the plates. Truth is, Irregular H/V Rafters can be put in either way, Centered of Shifted, but If you want the roof to be easier to construct, and fit together absolutely perfect, then it is my opinion that the shifted method is better. Your observation is correct about the H/V line meeting the inside corner of the fascia instead of the outside. Truer words are seldom spoken than the quote in your most recent comment: "There is more to these roofs than "meets the eye"." Your tutorials on using SketchUp are very good but your understanding of the Irregular Geometry is slightly off. Or at least at the same time. Splitting the difference does NOT give the correct hip pitch. Again, you'd want to ensure that the ridge of the new gable intersects the previous one at the same height. What do I do if FedEx delivered someone elses package? The roof pitch can change, but the units of run, 12 for a common and 17 for the hip remain constant. Go to Solution. I have only built one roof where a hip was joining two different pitch roofs at the corner of a house. Add 12-inch to the length. Potted ferns on front door. The valleys can be placed either at the top or bottom of each section so that they overlap with one another. This simplifies to (SQR(R2^2+R1^2))/R2. Pavilion roof: A low-pitched roof hipped equally on all sides and centered over a square or regular polygonal floor plan. On the View Control Bar, for Visual Style, select Shaded. Realized made math error refigured and I'm going with a 5/12 instead.jim. I watched both parts of the FHB tutorials about this model (linked below) with great interest. *Jim,No problem.Roof framing is what I do for a living Jim, and I enjoy the math that is associated with it, and enjoy talking about it with others like yourself.I worked out a formula for the Unit Rise of a hip or valley that occurs when two different roof pitches intersect at a 135 inside (valley), or outside (hip) corner. It is the most popular roof type. Amsterdam: Elsevier/Architectural Press, 2008.304, crow-stepped, corbie stepped, stepped gable, List of commercially available roofing material, "Rainbow roof | Article about rainbow roof by The Free Dictionary", https://en.wikipedia.org/w/index.php?title=List_of_roof_shapes&oldid=1129678825, Short description is different from Wikidata, Articles with unsourced statements from December 2014, Creative Commons Attribution-ShareAlike License 3.0. Roofing over an existing roof is also called reroofing or an overlay. Also, I don't use the perpendicular shift dimensions for locating the "Footprint", I use the right angle leg dims, of the scaled triangle, (found along the plate lines from the corner). Read on to find your favorite flower pot ideas that will add a pop 30+ Green Christmas Tree Decorations. Fit rafter board into the U-shaped hangers and nail it in place. Install shed rafters from the ledger board to the outer wall, using metal rafter hangers, which attach to the ledger board with screws or nails. This information should be the secret "clue" for the placement and rotation of the Hip Rafter as you demonstrate the Hip roof construction in your tutorials. This means that one intersecting roof is built on top of the other. It's looking like I'm going to have to eat a slice or two :-), "You could do it like this (centered), . Installing a new roof over an existing one can only be done if you have shingles because you can only put shingles over shingles. Measure the length of the joined area. 02-24-2023 03:33 AM Two pitched roofs different slopes joining together Hi Everyone, Quick question, can someone help me with this, please? As I recall, the last time I worked on a real roof like this it was cold, VERY windy, and the lumber wasnt straight. 5 Jun. Can a roof have 2 different pitches? Can't find what you're looking for? Autodesk does not warrant, either expressly or implied, the accuracy, reliability or completeness of the information translated by the machine translation service and will not be liable for damages or losses caused by the trust placed in the translation service. Autodesk does not warrant, either expressly or implied, the accuracy, reliability or completeness of the information translated by the machine translation service and will not be liable for damages or losses caused by the trust placed in the translation service. Ask the community or share your knowledge. The roof framer would need to use his quality conscience to decide what, if anything, should be done to correct it. ; as shown in your SU Demo.). The hip and valley pitch would be 7 9/16"/12 or on your speed square, that would be a 10.7 hip, just a little under the 11 mark.Using a framing square that would be about 10 11/16 / 17.Ken, I have only built one roof where a hip was joining two different pitch roofs at the corner of a house. Ken's answer in step three of 2.6833 is correct when using 2.6833 and 12 on your framing square. Things you will need: Working gloves Measuring tape Permanent marker Screwdriver Circular saw Metal snips Metal screws 2-by-4 and 1-by-1 lumber Butyl caulking 12-inch aluminum flashing Shingle Shingle remover Saw Roofing nails Underlayments Metal snips Procedures: Shed roof is your best option I think. Bonnet roof: A reversed gambrel or Mansard roof with the lower portion at a lower pitch than the upper portion. Apply sealant over exposed nails on the last strip. To Illustrate this using SketchUp and your models dimensions, draw a right triangle with one leg at 25' 9-3/8" and the other leg length at 17'2-5/8", now scale the triangle down so the hypotenuse is reduced to 1-1/2" (or the thickness of the H/V Rafter) I will then use this scaled down triangle to properly place the H/V footprint, in SketchUp virtually as well as on the job reality too. This page was last edited on 26 December 2022, at 16:37. Not including fascia thickness in the overhang dimension in the Tale of Two Pitches model was something I realized late in the modeling process. Prepare a flashing material in the width of approximately 12-inch. Checkout this next video clip to look into the what and why of soffit conditions generated with off-angle roof construction. It is the process where roofers install a new roof over your existing one, i.e. The ridge is the highest point on a roof, and youll hear professionals occasionally refer to it as a peak. Your depth of knowledge and insight will benefit any who invest a little time to read our dialog. Usages vary from region to region, nation to nation, and from one builder or architect to another. Can't find what you're looking for? Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page. 2. Is there a substitute for septic systems? Step 2) Find the square root of the sum of the squares of the unit rises, square root(3+6)=square root(9+36)=square root(45)= 6.7082, Step 3) Divide the result of step 1, by the result of step 2.18/6.7082=2.6833, Step 4) multiply step 3 by 172.6833x17=45.6161, Step 5) divide the result in step 4 by 12, Step 6) put the answer in step 5 over 17. Do you happen to have a good recipe for humble pie? Welcome to Autodesks Revit Architecture Forums. Trusted, in-depth guidance from the pros for framing a durable, code-compliant house. I've long lived by the credo: "If it takes a little work to make something a lot better, it's worth it. Complex roof cutting is part of why I love Sketchup so much. When we change one of the two roof pitches to make them unequal, the path of the hip will swing away from the bisected line, towards the steeper plate. the "one" and the "six" as compared to a diagonal line joining the lower right to upper left corner on the face of the "one" on that dice.Sincerly Maurice. June 7, 2022; certified financial therapist To unjoin roofs, click Modify tabGeometry panel (Join/Unjoin Roof). An inspirational, peaceful, listening experience. The most common parameter is to maintain an equal ridge height over building sections with differing spans. joining two pitched roofs together. Cutting all rafters on the ground makes sure we aren't slipping on sawdust up above.8:00 - 15:40 Installing rafters.Nailing the rafters on the layouts done earlier on, and down at the sleeper. from the existing trusses.You want to continue the roof layout from an existing location to ensure the roof sheathing goes down without conflict. If there is viewer interest I will draw and upload a roof framing model to clarify how wall and rafter framing would be configured to meet this design criteria. Only two ways you can do that is bring that out as a third hip, just like the two big ones. I drew it right here on this paper! For any other 2 roof pitches, just substitute the new unit rises for 3 and 6 in the above steps. Measure the offset in SU and you'll see it is less than 1/2". (And use "Face -to-Face" of stud walls for the rough frame dimensions. *(If the building has equal width overhangs then the spans should include the overhangs, including the fascia thickness.). Just use R1 on one side and sqroot of the sum of the squares all divided by R2 on the other side of the square. Pretty Home Office Ideas For 10+ Front Entrance Plants Ideas. *Tool Shed,Your figures are very close and I'm sure the roof came out nicely using the figures that you mentioned.The actual bevels are 39 for the 12/12 jacks and 51 for the 9 3/4 /12 jacks. Thanks for the detailed answerI really appreciate it. jack the ripper documentary channel 5 / ravelry crochet leg warmers / joining two pitched roofs together. Attach the first horizontal rafter to the main beam. Go to Solution. You can join roofs to other roofs or walls, or unjoin them if they were previously joined. If necessary, use the ViewCube to spin the design to facilitate selecting the wall or roof edges. If I do a "Part III" as you suggest I can address this to help eliminate confusion. This is a dialog window which overlays the main content of the page. "Span Roof". I appreciate your input on this topic. How to Calculate Rafters for Intersecting Roof Planes the Easy Way, Model and Measure Part One: Hip Rafters Demystified by Visualizing in SketchUp, Expert insights on techniques and principles. I was taught to split the different pitches thus coming up with the hip pitch. (The old German Carpenters did them both ways.) Pick the section where two edges will cross. For those with existing casual knowledge in using Sketchup, I think it is important to emphasize the point Mr. Jackson made about using the temporary top bevels on the ridge beams. Each roof will be slightly different. If I had the calculator, I wonder if I would have spent the time educating myself with the help of the kind guys who answered my query. Another approach (my approach) is to draw the rafters first without a ridge beam; as if they are simply mitered at the peak. 2023 The Taunton Press, Inc. All rights reserved. Compare with. If you had the forethought to make the common rafters into components then you just cut one back and they all cut back. Add 12-inch to the length. . This forum discussion should start fulfilling that requirement. The 17-in. . I fixed the fascia position by "re-cutting" rafters to make the roof planes line up. Doesn't make sense to me!). to achieve equal fascia height and projection on your unequal slope intersection roof you have to raise your minor roof walls the difference of fascia elevations. I searched through the forum, but i couldn't find a solution that worked, everything i. In this episode I'll go through and show you how to join two roofs together to form a valley. I can't see how or why the offset is necessary though. Solved by barthbradley. Also, when building an Irregular with Equal Ridge heights, the tangent of the plan angle is (Minor Span/Major Span). You are correct. *Ken I find your formulas very interesting and helpful. And fixing them will show you something's about unequal pitches that you have missed. When framing Irregular Hip/Valley Roofs, the H/V Rafter members are not equally split by the sheathing lines. Pyramid roof: A steep hip roof on a square building. Pick the section where two edges will cross. *Maurice, All hips do not intersect the ridge at a 45 degree angle - only when they are equal pitches is that true. Sign up for eletters today and get the latest how-to from Fine Homebuilding, plus special offers. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. nov 1, 2021. You could convert to any base by dividing by twelve and multiplying by the new base you want to use and using this result and the chosen base as your two numbers on the square. And when using your steps one through three it is exactly what he came up with. figure is arrived at by calculating the diagonal in a 12-in. is tuff hedeman still married,