A Step-by-Step Guide of Extending A Hip Roof

The majority of modern roof designs nowadays include pre-made trusses. However, extending an existing hip roof typically requires a handcrafted frame due to its complex nature.

If you look forward to a hip roof addition project, then the steps of extending a hip roof below will inform you about what to expect during the process.

How Do I Extend a Hip Roof

A hip roof, also commonly referred to as a hipped roof, is a roofing style with a characteristic of downward slopes from all wall sides, causing it not to have any vertical side. It is easily found in North American buildings and gable roof styles.

extending a hip roof

Read also: How to Build a Gable Porch Roof

There are many hipped roof extension designs and styles out there, but regardless, here are essential steps for extending a hip roof:

  1. Measuring the house’s ridge board length: In this step, you must measure the building’s width and reduce the figure with the building’s length. For instance, if the building has 25 ft. of width and 40 ft. of length, the ridge board must be 15 ft.
  2. Trimming the length of the common rafters: This step is pretty much identical to the step of trimming gable roof rafters. Determine what length you need to cut based on the size of the building and the pitch of its roof. To let the rafter fit comfortably above the wall, which results in a properly sturdy and well-fit rafter, you need to create a seat cut in the roof rafters.
  3. Nailing the common rafters into the ridge board on every side of the roof: Secure the ridge to its place by elevating the ridge board and nailing it to the common rafters on its side. After all the common rafters are secured to the ridge, they will be locked firmly in place and unable to move.
  4. Measuring the hip rafters’ length: This step involves working out the hip rafter that extends from the ridge board to the building’s corner, which has to perform at a 45º angle.
  5. Make sure that the hip rafters are secured in place: while the jack rafters are fitted, you need to make sure the hip rafters don’t move by using a piece of string. They need to be maintained at a 45º angle.
  6. Measuring the jack rafters’ length: You can look up the table of rafter length online. Then, you need to cut them according to the size and install them similarly to the regular rafter. Ensure that the hip rafters are locked securely to their place while performing these steps and stay at a 45º angle while the rest of the project is finished.

This guide for extending a hip roof is also applicable when adding a gable roof addition to a hip roof. However, this project is unsuitable for amateurs and may require a structural engineer to design the rafters and trusses.

Therefore, it is recommended to seek professional help to ensure that the extension blends seamlessly with the rest of the house.

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RoofLast is an experienced author and roofing expert. With years of practical experience in the field authored several informative articles on various aspects of roofing, including installation, maintenance, and repair