When you say a "party wall" do you mean an actual wall? The structure on the right is a glass framed tunnel and on the left is a existing structure. For the porch area, sketch it but don't define a slope. Model them as two separate roofs and use walls to fill in the gap. Your builder is pretty amateur. This cookie is set by GDPR Cookie Consent plugin. Is is possible to join 2 pitched roofs of differing heights? In simple words, we can say that it gives information about the measurement (in inches) of how the roof rises from the pitching point to the ridge in every standard 12-inch depth. Go to Solution. Take a piece of the lumber and then slip it under the roof pitch that has a higher position. Different ceiling heights - yes, no, but if? | Houzz UK Measure the size of the underlayment to have the same length as the joined area but 1-inch wider than the flashing. Use any flat edge that will create a crisp angle. 5:00 1 key programmed to Intersect/Join Two Lines. Step Six: Seal any seams or joints on your roof. Prepare the area by identifying where the two different-pitched roofs will meet. Based on all those, please think carefully about whether or not you have the skill to do the project. How should this be made right so we can communicate it to them better? How to Sew Two Curtain Panels Together Crafty Sewing? Well, here's what you need for joining two roofs with different heights. It means that here you will connect the new roof to the existing one. However, at the end of the day, you will realize it as the right decision, particularly for you who do not have a good roofing skill. After the valley has been cut, then you can place a rubberized asphalt membrane on top of it and join them together. Next, you have to take care of the flashing to create a more attractive look. The last but not least step that you must follow is using shingles that have the exact same appearance with the one existed on the roof to cover the flashing so later no one will even notice its existence. What do you recommend? We may share certain information about our users with our advertising and analytics partners.