Ask the community or share your knowledge. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. Thanks for your help , I was thinking of keeping the style similar to the rest of the house. Share your knowledge, ask questions, and explore popular Revit Architecture topics. Posted on June 7, 2022 by joining two pitched roofs together . Thanks again Steve I will look into it.Maurice, *Thanks Ken and BillCutting 6/12 into 9/12 tomorrow came up with +- 5 3/4 in 12 for the hip. I see a problem on the horizon though: what to title the new post? One for the same pitch values and the other for different pitches. Davies, Nikolas, and Erkki Jokiniemi. 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. This page has been translated for your convenience with an automatic translation service. The length of the run of the hip(per foot run) is the diagonal or SQR(1 + (R1/R2)squared). Elegant rustic christmas decor with fir branches, white roses, a candle lantern. This is the base number on your square. Complex roof cutting is part of why I love Sketchup so much. And backing bevels are not absolutely necessary to the process them as with the equally split (centered) Irregular H/V Rafters. run on a common rafter. 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. 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). Prepare a flashing material in the width of approximately 12-inch. *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. 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. 3/12 and 6/12 is 4.5/17.Is this correct? Answer was of course 5/12. . If you're saying they should be off-center please explain. It appears that you have the meeting planes aligned to the inside of the fascia thickness instead of the outsides. 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. 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. 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. Go to Solution. - M.K. The most common parameter is to maintain an equal ridge height over building sections with differing spans. Become a member and get unlimited site access, including the Image two gable roofs side by side. http://veritasdomain.files.wordpress.com/2007/06/escher-waterfall-medium.jpg. I've long lived by the credo: "If it takes a little work to make something a lot better, it's worth it. 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. This page has been translated for your convenience with an automatic translation service. Joining unequally pitched roofs getting oriented. (Of course, your demo has both ridge heights equal, so either could be considered the Major Pitch, but I always default to the Lesser Pitch as the Major Pitch, for explanation sake. joining two pitched roofs together. Thanks. Select an edge of the roof that you want to join, and then select the wall or roof to which you want to join the roof. joining two pitched roofs together. 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. Same with ridges, this is what determines which pitch is the Major and the other Minor. JavaScript is disabled. This is not an official translation and may contain errors and inaccurate translations. Only then is the diagonal approximately 17 (12*Sqr2). Sign up for eletters today and get the latest how-to from Fine Homebuilding, plus special offers. 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. i.e. I will check however. 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. I understand your explanation of the process for locating the offset hip/valley footprint. Centered" question. Joining these two roofs poses two main challenges: One is getting the two differently pitched planes to meet at the hip (or valley) rafter. After doing the math I still checked it the old string-line, level and square way. We'll start with the knowledge that the main roof has an 8 / 12 pitch. 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. This video above shows how the finished roof planes in off-angle roof construction will look when completed. You cannot join a roof to more than one top face of another roof. So if you make the plumb cut on the hip 6/12, it should fit nicely.Here's something really unusual.Look at the drawing. The wall must be attached to the target roof and the target roof must be a footprint roof. It is not possible to mix materials, nor to install a new layer over slate or wood tiles. . Then you have to cricket both sides between the existing hips and the new one. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. As I recall, the last time I worked on a real roof like this it was cold, VERY windy, and the lumber wasnt straight. 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. I guess I will have to track one down up here. The number on the blade of the square is R1. After the addition roof is framed and sheathed, snap a line on the existing roof shingles 2 in. Source: www.jlconline.com. That's the hip pitch. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Have you ever wondered how roofs tie together? Cant see the rest of your roof but you could try roof by extrusion. For example, in an equal hip roof with an 8 / 12 pitch, the pitch of the hip rafter would be 8 / 17. joining two pitched roofs together. On the other hand, you can opt for cemented roof patterns which are covered by other roofing material. But here it will be different, since the hip rafter doesn't lie at 45 degrees to the commons. The only differenc is we used P1,P2 and P3. Get home building tips, offers, and expert advice in your inbox. Only two ways you can do that is bring that out as a third hip, just like the two big ones. Or do a shed roof tying into the two hips on the sides and sloping up and tying into the main roof on the back. For instance, you can opt for a wooden base structure and place the rooftop on it. Attach the first horizontal rafter to the main beam. Is there a substitute for septic systems? This is a dialog window which overlays the main content of the page. Spiral, a steeply pitched spire which twists as it goes up. 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. Thanks for this post.you might be interested in checking out fine luxury homes by Brejnik Fine Homes (www.brejnik.ca). Thanks for stopping by The Digital Job Site. *Jim,That was pretty amazing. Step Four: Place the rubberized asphalt membrane on top of the roof section. With regular pitch H/V roofs the equality simplifies fascia alignments. From a modeling standpoint it should be corrected. Even though this is a small roof the steps are still the same f. Or at least at the same time. Thanks for sharing at The Digital Jobsite. 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. Get home building tips, offers, and expert advice in your inbox. Once completed I'll upload the model to the Component Warehouse for feedback. 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. For connecting the two gable roofs horizontally, the ridge of the gable roof should be placed on the ridge of the addition. Thanks again.jim. ( 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 He can out woodwork, drywall tape and finish me hands down. *KenSo it's true great minds think alike. Viewers who look closely at the (newly revised) Off-Angle Roof model will notice complex angle/bevel cuts necessary when the H/V rafters are centered. Not including fascia thickness in the overhang dimension in the Tale of Two Pitches model was something I realized late in the modeling process. figure is arrived at by calculating the diagonal in a 12-in. How do I make it seamless? Install f. (i.e. . This is for 90 corners ONLY, which I assume is your case. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page. I fixed the fascia position by "re-cutting" rafters to make the roof planes line up. That's likely the condition in the field. Welcome to Autodesks Revit Architecture Forums. "The length of hip rafters is calculated on the basis of a 17-in. It is the most popular roof type. Another by-product of this roof configuration is varying soffit heights and widths which require further design decisions. In My Opinion, because of the difference in the way they are processed to fit, it is necessary to examine both methods when demonstrating Irregular Roof Framing. Then, based on the structural ridge beam size you need draw a beam that passes through the rafters at the proper location. Ken's answer in step three of 2.6833 is correct when using 2.6833 and 12 on your framing square. See the whole room at werethejoneses.com. with a few changes on what you have made it would be a great resource to use to teach apprentices that have a hard time visualizing. 3. but there's a better way." That is what makes SU so cool, Real, and Live, 3-D models. Do you happen to have a good recipe for humble pie? Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Welcome to Autodesks Revit Architecture Forums. A valley joint, the two overlapping sections of roofing material, is cut to form an inverted V-shaped ridge. If necessary, use the ViewCube to spin the design to facilitate selecting the wall or roof edges. For the final row, cut shingles into strips. Determine where the two roof edges will cross and add 12 inches to that length. joining two pitched roofs together. I have enjoyed reading the theory and practical application to a somewhat seemingly simple framing question. These two numbers when squared, added, and taken the square root of also give you the length of the hip per foot run. 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. It works best with contrasts in siding, stone or other features. You can use the roof by extrusion to create that. I hope you find The Digital Jobsite and SketchUp helpful in visualizing non-standard roof framing configurations. . Do not sell or share my personal information. This site is protected by reCAPTCHA and the Google. *Ken I find your formulas very interesting and helpful. "Span Roof". sketchup is a great program. I searched through the forum, but i couldn't find a solution that worked, everything i. It brings to light more of the geometric constraints of roof framing. (?). Ironically, in this case the teacher (me? Also, when building an Irregular with Equal Ridge heights, the tangent of the plan angle is (Minor Span/Major Span). I respect your persistence. Pavilion roof: A low-pitched roof hipped equally on all sides and centered over a square or regular polygonal floor plan. *Spend the 80 bucks on a construction master 4 calculator and all of your problems will be solved. How do you join two pitched roofs together? The porch joined the house at right angles to a shed roof section. Your tutorials on using SketchUp are very good but your understanding of the Irregular Geometry is slightly off. Add decking atop the roof and nail on metal flashing where the shed roof joins the existing roof. Helping You to Do It Yourself! Framing Project Guide. *(If the building has equal width overhangs then the spans should include the overhangs, including the fascia thickness.). 02-24-2023 03:33 AM Two pitched roofs different slopes joining together Hi Everyone, Quick question, can someone help me with this, please? Generally, we can describe the double pitched roof as a triangle that consists of two surfaces which are connected with ridge on the top, Click Modify tab Geometry panel (Join/Unjoin Roof).Select an edge of the roof that you want to join, and then select the wall or roof to which you want to join the roof. 160I hope that passage explains it well enough. That's what Fascias cover up. If we use 1 as the run for one foot it simplifies the calculation to as follows: Let R1 be one rise (3) and R2 be the other(6). What do I do if FedEx delivered someone elses package? Thanks in advance. The modal window is a 'site map' of the most critical areas of the site. This is not an official translation and may contain errors and inaccurate translations. Source: tomtarrant.com 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? Next, you will cut out two. If the roof will be framed w/o backing the Ridges and H/V rafters (bevels), then they should be shown as you would frame them. run, as opposed to the 12-in. from the existing trusses.You want to continue the roof layout from an existing location to ensure the roof sheathing goes down without conflict. Don't know if the hips are going to cause issues with it, always been gables when I've done them. Using SketchUps Layers feature is not unlike peeling layers of an onion (except I hope shortcomings in my video production wont bring you to tears) so we can get an up-close look at how various framing components fit together. Compare with. How Do You Tie Two Roofs Together? Make sure to always pull the same way for every rafter or you'll confuse yourself.6:16 - 7:59 Cutting rafters.With numbers pulled up top, everything can be done down below. Use more sealant along the top edges of all shingle strips. Thanks for "stopping by" the Digital Jobsite. According to MyRooff, a dual-pitch roof is a gable roof with two sloping sides that meet together at the top, forming a central ridge. Roofing over an existing roof is also called reroofing or an overlay. At the end of the second one you began verbally stumbling with your explanation a bit. . Equally splitting the rafter that joins unequally split pitches? * The Major Pitch contains the Ridge and typically is the Lesser. Multi-pitched roof: Gable (ridged, dual-pitched, peaked, saddle, pack-saddle, saddleback, span roof): A simple roof design shaped like an inverted V. 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 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. If that is clear. The 17-in. 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. 5 Jun. Start your subscription today and save up to 70%. The valleys can be placed either at the top or bottom of each section so that they overlap with one another. This seems to be an ideal application of the principal. 2. Measure the length of the joined area. Even with perfect math, in a framing situation an error of that size could be the result of nominal framing lumber variance, crowns in rafters, etc. 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. 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 easiest solution is to use a roof butt. An inspirational, peaceful, listening experience. Joining two sloping roof sections together, such as in the case of a shed or gable roof, then. ), Even with SketchUp, and drawing Irregular H/V Roofs, it helps to know the proportions of the roofs to construct everything perfect. Have been very busy the past few days.In the process of deriving the formula that I have shown, in the next to the last step of the derivation, I ended up with the square root of 2 as a factor in the denominator of the formula. Or you can find the angle and cut both roofs? Can't do it the way you have it drawn. Below are the steps on how to join two roofs together if they have different pitch: Prepare the daerah by identifying where the two different-pitched roofs will meet. The main difference between the two is that valley rafters sit on inside corners, while hip rafters sit on the outside corners. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Measure the offset in SU and you'll see it is less than 1/2". I was taught to split the different pitches thus coming up with the hip pitch. To maintain a consistent ridge height in these situations the roof pitch must be adjusted. It is the process where roofers install a new roof over your existing one, i.e. I can't see how or why the offset is necessary though. 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.). When framing Irregular Hip/Valley Roofs, the H/V Rafter members are not equally split by the sheathing lines. Keep in mind that when you change roof pitch it also affects length of overhangs and alignment of fascia. The valley rafter was as you said close enough according to the string level and square. square, which is 16.97in., rounded to 17. If it takes a lot of work to make something a little better, it's probably not worth it." Both types of rafters have the same vertical rise, from the plates tothe ridge, but the hip comes in at a 45 degree angle, which results in a longer horizontal run. 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. Is this correct? 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. 2) Also, if you will "fly" around in your model and look up the valley you will notice that the valley line does not align to the outside of the inside corner of the fascia as it should. Solids Tools make quick work of cutting complex angles on virtual jack, hip, and valley rafters. Go to Solution. The modal window is a 'site map' of the most critical areas of the site. 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. The first step is to make a scale drawing of the entire roof locating the exterior walls ridges and. This site is protected by reCAPTCHA and the Google. - without the weired cut visible here .. Answer (1 of 4): To join two flat roofs together, you will need to follow these steps: 1. Here's how!0:00 - 2:45 Sleepers installed.Sleepers are where your rafters will land, these are installed nailed down into trusses or rafters below to ensure a solid connection.2:46 - 4:09 Ridge Board installed.The Ridge is where your rafters will but into up at the top, your ridge board creates the 'peak' of the roof. Welcome to Autodesk's Revit Architecture Forums. ", This guy drew a lot of things that can't be built. I'm sure you may be hearing fromn me.jim. Been around a lot of years, but never saw slope in terms of xx/17. 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. . "The Machine Shop and the Works. Cut the roofs: Using a circular saw or other appropriate tool, cut the roofs along the marked line. Use these tips to keep cables tight and straight for a professional-looking deck-railing job. For a better experience, please enable JavaScript in your browser before proceeding. *Dumb DIY question. ( 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 a position where it makes an angle of 41 3/4 with the 9/12 plate, and 93 1/4 with the 6/12 plate, as shown in the attached drawing.For all practical purposes, the run of the irregular hip, is almost identical to the run of a 6/12 common rafter. Thanks. 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. You can join roofs to other roofs or walls, or unjoin them if they were previously joined. Installing First Rafter. Really enjoying the answers to my question. Measure and mark the connection: Measure and mark the point where the two roofs will meet. 20+ Home Office Decor Ideas For Her. 2023 The Taunton Press, Inc. All rights reserved. Sorry about that. "Smooth Framing" is what I like to call it. Shed roof is your best option I think. To simplify your demo above, make the spans simpler with their proportions, for example, 30' and 20'. With irregulars, the equal thickness of the fascia becomes a factor for proportionate slopes. Hopefully by that time I'll have learned enough about the process to post a viable follow up. On the View Control Bar, for Visual Style, select Shaded. I drew it right here on this paper! 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. About the overhangs/fascia issue; Your SU model has the Major Roof showing the Fascia planed to the outside shoulder and the Minor Roof is planed to the inside shoulder, so the model is inconsistent in that respect. Dividing these numbers gives you the ratio of 2.6833 which gives Kens original product of R1 time R2 divided by the Square root of the sum of the squares. Roof terminology is not rigidly defined. overcome hurdles synonym LIVE To translate this article, select a language. An unequally pitched valley rafter is laid out in the same way as the unequally pitched hip. up from the valley center, and cut through the shingles and underlayment. Joining Two Roofs of Different Pitches By John Carroll Download the PDF version of this article. To unjoin roofs, click Modify tabGeometry panel (Join/Unjoin Roof). nov 1, 2021. "Larry Haun., The very Efficient Carpenter. One side of the hip triangle is 1 (one foot) and the other is R1/R2*1 or R1/R2 (thats why we chose one). For any other 2 roof pitches, just substitute the new unit rises for 3 and 6 in the above steps.