But I'm having a problem with the design of the join , and making this waterproof. It's looking like I'm going to have to eat a slice or two :-), "You could do it like this (centered), . To clarify the offset H/V method I'll "build" and upload an additional off-angle roof model to compare the similarities and differences between the two methods discussed here. Ensure strips are wide enough to cover nails. Ken's number are correct, but where did the 17 come from?? Remove the shingles and underlayment on the edges of both pitches. Start your subscription today and save up to 70%. 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. I will check however. Thanks again.jim. Cross gabled: The result of joining two or more gabled roof sections together, forming a T or L shape for the simplest forms, or any number of more complex shapes. 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. joining two pitched roofs together. Go to Solution. When framing Irregular Hip/Valley Roofs, the H/V Rafter members are not equally split by the sheathing lines. Pick the section where two edges will cross. 1) If the H/V rafters are not backed, the H/V rafters should not be equally split from the Hip/Valley line in plan-view. How do you combine two roofs? ( the same thing that occurs at a 90 corner when 2 different roof pitches are involved)It just so happens, because of the ratio of the roof pitches that you have, 6:9, that the hip will swing to The roof framer would need to use his quality conscience to decide what, if anything, should be done to correct it. 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.e. You can join a roof to the top face of another roof and the wall below that roof if you select the wall as the target. 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? For example, if the 2 roof pitches involved were 3/12 and 6/12, the correct hip pitch is not 4.5/17. How do you tighten a loose recliner footrest? To translate this article, select a language. Then you have to cricket both sides between the existing hips and the new one. Measure and mark the connection: Measure and mark the point where the two roofs will meet. Your observation is correct about the H/V line meeting the inside corner of the fascia instead of the outside. *Ken describe-rarelyCrazy thing is you got me through that one in February and now in March I'm faced with a similar situation, This time though it is a 9/12 into an 11/12. While raising wall heights can indeed make the fascia line up, all other things being equal, it would make the ridge heights differ by the same amount. Another by-product of this roof configuration is varying soffit heights and widths which require further design decisions. You can join roofs to other roofs or walls, or unjoin them if they were previously joined. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. After you sketch walls and a roof for your design, sketch another roof that you want to join to the original roof. I can't see how or why the offset is necessary though. Realized made math error refigured and I'm going with a 5/12 instead.jim. Passmore, Augustine C. (1904). Do you happen to have a good recipe for humble pie? 4) Type of Join and the structure to hold the roof together Well, there are many join types that you can consider. 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. The other is to get the fascias to line up. For instance, you can opt for a wooden base structure and place the rooftop on it. The new roof will need to be cut to the right angle so that it fits snugly against the roof. Even though this is a small roof the steps are still the same f. . *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. *Jim,That was pretty amazing. Well, here's what you need for joining two roofs with different heights. The second roof line isn't fully integrating into the first, as shown in the attached photo the main roofline is fully roofed underneath the existing roof. Davies, Nikolas, and Erkki Jokiniemi. It sounds complicated but in practice it isn't. Pick the section where two edges will cross. ), Even with SketchUp, and drawing Irregular H/V Roofs, it helps to know the proportions of the roofs to construct everything perfect. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. And because the modern circular saws can be set to match cheek-cut bevels, this tool geometry is a big part of the ease with which these rafters can be accurately marked and cut (*processed). *Hi Art,No question is ever dumb. For a better experience, please enable JavaScript in your browser before proceeding. Inspection The first thing that you need is to do a thorough inspection and have an idea of the overall situation of the joining area. 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. . Or you can find the angle and cut both roofs? Solids Tools make quick work of cutting complex angles on virtual jack, hip, and valley rafters. How Do You Tie Two Roofs Together? Install f. (And use "Face -to-Face" of stud walls for the rough frame dimensions. Have "sum more" fun. Fit rafter board into the U-shaped hangers and nail it in place. I agree it would be a great resource for the learning process. *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. I should have adjusted things at the time as now you've nearly convinced me I should re-work the model. joining two pitched roofs together2nd battalion, 4th field artillery regiment. Read on to find your favorite flower pot ideas that will add a pop 30+ Green Christmas Tree Decorations. 02-24-2023 03:33 AM Two pitched roofs different slopes joining together Hi Everyone, Quick question, can someone help me with this, please? Thanks in advance. This seems to be an ideal application of the principal. I'm sure you may be hearing fromn me.jim. Your in-depth and wide ranging experience from work and business along with extensive knowledge of SketchUp is always an asset to the discussion here. Shed roof is your best option I think. Elegant rustic christmas decor with fir branches, white roses, a candle lantern. A valley joint, the two overlapping sections of roofing material, is cut to form an inverted V-shaped ridge. 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. Joining two sloping roof sections together, such as in the case of a shed or gable roof, then. Determine where the two roof edges will cross and add 12 inches to that length. Make sure to hold your rafter fill flush to top of ridge.15:41 - 18:50 Bracing / Support for over-framed roof.This varies structural engineer to structural engineer. Establish the pitches. Grandpa and my dad always used "12" for everything, never calculated, just eyeballed the hips and jacks and cut in place with a handsaw, always getting within 1/4" of centers. 5 Jun. 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. (?). This forum discussion should start fulfilling that requirement. It's possible to work out a mathematical formula for any situation, but why bother, when you only need it about once in a decade? Thanks for sharing at The Digital Jobsite. *Dumb DIY question. Although uncommon, there are situations where architectural parameters require off angle hip and valley roof construction. (i.e. Solved by barthbradley. A valley joint, the two overlapping sections of roofing material, is cut to form an inverted V-shaped ridge. The result is better understood by looking at the original geometry of the problem. *(If the building has equal width overhangs then the spans should include the overhangs, including the fascia thickness.). Thanks for "stopping by" the Digital Jobsite. If you had the forethought to make the common rafters into components then you just cut one back and they all cut back. The most common parameter is to maintain an equal ridge height over building sections with differing spans. 1. For most typical conventional roof framing they would be processed almost as easily as a common, the length derived using the same "Effective Run" base dimension as used to calculate the Commons. A roof with two slopes that meet at a central ridge. Another approach (my approach) is to draw the rafters first without a ridge beam; as if they are simply mitered at the peak. Thanks Mr J. and who've participated in this discussion so far something tells me its not over yet :-), Placing the fascia to plane to the outer edge is all that was needed to fix the "A Tale of Two Pitches" SketchUp demo assembly. There are many roof styles, but the most common are gable, which. Cross hipped: The result of joining two or more, Bell-cast (sprocketed, flared): A roof with the shallow slope below the steeper slope at the eaves. And, the same geometry found at the plane of the intersecting plates can also be found at the plane of the top of the ridge board. how do I combine those 2 pitched roof so thy run smoothly? Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. Think of it as a diagonal line joining two planes of a dice from a lower corner to a upper corner i.e. Potted ferns on front door. joining two pitched roofs together. This is a dialog window which overlays the main content of the page. Since I've personally not framed this type of roof using the offset method it may take awhile to put the Digital Jobsite Blog post together. run, as opposed to the 12-in. Add 12-inch to the length. The first step is to make a scale drawing of the entire roof locating the exterior walls ridges and. building an unequal slope intersection is an essential part of becoming a journeyman carpenter. It also helped me to understand the point you raise: Soffit width and fascia height can be made equal by adjusting the roof pitch and rafter bearing height. I was taught to split the different pitches thus coming up with the hip pitch. Start your subscription today and save up to 70%. Add decking atop the roof and nail on metal flashing where the shed roof joins the existing roof. Can't find what you're looking for? ), learns a lesson in the process of teaching. To maintain a consistent ridge height in these situations the roof pitch must be adjusted. We (he) spent about an hour or so working out the fomula for me and I put it in my lunch box and lost it. 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. He can out woodwork, drywall tape and finish me hands down. It was fun to build this roof framing model considering the Great Weather, Straight Lumber and a fully functional Board Stretcher available at The Digital Job Site. Measure the offset in SU and you'll see it is less than 1/2". This simplifies to (SQR(R2^2+R1^2))/R2. Hopefully by that time I'll have learned enough about the process to post a viable follow up. I hope this helps with your "Shift Vs. I have enjoyed reading the theory and practical application to a somewhat seemingly simple framing question. Before you can join two roofs together, then one of them will need to have a valley cut into it that is large enough for this material to be placed in between and seamed together at different angles. "Smooth Framing" is what I like to call it. If that is clear. You don't need to multiply them out unless you want to change bases on your square. 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. We'll start with the knowledge that the main roof has an 8 / 12 pitch. Framing Project Guide. Thanks for stopping by The Digital Job Site. Roof terminology is not rigidly defined. A lead hand framer is saying go with the lower pitch (3/17) as the hip and frame 3/12 jacks into it on the one side and the 6/12 jacks into it from the other side. I searched through the forum, but i couldn't find a solution that worked, everything i. Gable roof with eaves, exposed, decorated rafters and soffits, and stepped ascending apexes, temple in Chang Mai, Thailand. In a hip roof with equal pitches, the unit run of a hip or valley rafter is 17 inches for every 12 inches of run in the main roof. Share your knowledge, ask questions, and explore popular Revit Architecture topics. Thanks. ; as shown in your SU Demo.). With irregulars, the equal thickness of the fascia becomes a factor for proportionate slopes. Well also get a look at how actual rafter framing would look on such a roof. pg. Have you ever wondered how roofs tie together? The modal window is a 'site map' of the most critical areas of the site. Achieving even ridge height requires non-standard rafter cuts, Differing spans and matching ridge heights require off-angle roof framing. Use these tips to keep cables tight and straight for a professional-looking deck-railing job. Your tutorials on using SketchUp are very good but your understanding of the Irregular Geometry is slightly off. A lead hand framer is saying go with the lower pitch (3/17) as the hip and frame 3/12 jacks into it on the one side and the 6/12 jacks into it from the other side. Can't do it the way you have it drawn. Thanks Sly, I was too tired to do that. . It is the most popular roof type. 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. Complex roof cutting is part of why I love Sketchup so much. Answer was of course 5/12. *Thanks Maurice: Good ol' sq root of 2, should have guessed that, but never too old to learn. After the addition roof is framed and sheathed, snap a line on the existing roof shingles 2 in. Below are the steps on how to join two roofs together if they have different pitch: Prepare the area by identifying where the two different-pitched roofs will meet. Don't know if the hips are going to cause issues with it, always been gables when I've done them. Note that you cannot add the second roof by editing the sketch of the first. These dims are more useful for deriving the jack lengths and don't require extra math steps to find. The valleys can be placed either at the top or bottom of each section so that they overlap with one another. figure is arrived at by calculating the diagonal in a 12-in. Save my name, email, and website in this browser for the next time I comment. Would you explain to me where the (.7071) came from.Also how would you go about figuring the hip shorting and set backs and the 2 backing angles. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. With the Orbit capability of SketchUp we can check out some of the various roof features as well as get an overview of how dimension/angle factors influence the resulting configuration.

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