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Siding & Exterior Trim

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Design / Build

Gable-End Eave Design

Learn how to detail exterior trim with harmonious proportions on eaves that don't return onto the gable.

By Marianne Cusato Issue 281 – Feb/Mar 2019
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The three primary variables to consider when designing the eaves for a gable roof are the width of the gable trim, the projection of the eaves, and the details at the corner of the gable ends. This first installment of a two-part series focuses on eaves that do not return onto the gable. The second looks at the details of boxed-eave gable-end returns.

General rules of thumb

Eave design starts with looking at the overall building composition and proportion. When designing a gable-end eave without a return, the dimensions to look at are the width of the trim (set between 6 in. and 8 in. thick) and the overhang from the side wall (set between 12 in. to 18 in., depending on the style of the building). avoid gable ends that are over 8 in. wide, especially when the eave overhang is less than 12 in.

Start with roof framing

The design of your eave is dictated by the construction of your roof. before manufactured trusses, the simplest roof construction involved extending exposed rafter tails beyond the walls of the house. Trusses streamline construction, but it’s important when using them to make sure the resulting eave works with the design of your building.

open eaves with roof rafters to the left, and with trusses to the right
Left: Open eaves with roof rafters, Right: Open eaves with trusses

Open eaves with roof rafters

before roof trusses, the exposed rafter tails were an extension of the roof framing. The ceiling joists pushed the rafters up and gave extra height to the building.

Open eaves with trusses

When designing an open eave with roof trusses, make sure that you raise the heel of the truss and use a thicker top chord. doing so raises the eave, which prevents it from conflicting with the window head height.

various styles of closed eave design
From left to right: Closed eaves with angled soffit, Closed eaves with flat soffit and no raised heel, Closed eaves with flat soffit and raised heel

Closed eaves with angled soffit

Exposed rafter tails are more work to install and maintain over time. Moreover, as homes have shifted increasingly to conditioned attics, closed eaves have become more popular. With a closed eave, you still want to raise the heel height of the truss. Also, make the extra effort to install an angled soffit. It looks substantially better than a flat soffit.

Closed eaves with flat soffit and no raised heel

The default in eave design is a flat soffit. While flat soffits work well in some situations, in most, they result in pork-chop eave returns. Proceed with extreme caution when using a flat soffit.

Closed eaves with flat soffit and raised heel

When you do use a flat soffit, make sure to include a raised heel on the truss. This pulls the eave up, giving height to the roofline as well as keeping the eave clear of the window head height.

Gable-end details for closed eaves

angled soffit
Angled soffit

Angled soffit

The cleanest look for a gable end with a closed eave is to angle the soffit, therefore eliminating the need to resolve the eave at the gable end. This configuration gives the look of an open eave, but it has the same benefits— ease of maintenance and energy performance—as a closed eave.

Pork chop eave
Pork chop eave

Pork-chop eave

The much-derided pork-chop eave has been covered in depth in many articles. It is the unfortunate result of connecting the geometry of a flat soffit on the side eave with the angle of the gable end. This is a detail to avoid at all costs. If you are not able to use an angled soffit, use one of the two flat-soffit details illustrated below. There is no reason to use a pork-chop eave.

flat soffit
Flat soffit

Flat soffit, stopping at end wall

If you must use a flat soffit, stop the flat portion of the soffit at the wall to align with the corner board. This allows the gable projection of the eave to extend down and look like an angled soffit at a glance.

 

Flat soffit with bracket
Flat soffit with bracket

Flat soffit with bracket

While flat soffits are not ideal, one way to mask them is to stop the horizontal soffit at the gable-end wall, as in the previous example, and then add a decorative bracket at the gable end to hide the transition from flat to angled.                                                                                                                                                                                                                                Plumb- vs. square-cut eaves

Plumb-cut eaves are perpendicular to the ground, while square-cut eaves are perpendicular to the angle of the roof.

Refined versus vernacular eave design
Refined versus vernacular eave design

Marianne Cusato is the author of Get Your House Right: Architectural Elements to Use and Avoid. Drawings by the author.

Read more about roof design:

  • Designing the right roof rake
  • Venting a Traditional Eave
  • Victorian Brackets

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Previous: Upgrading the Basic Trim Package for a Colonial Home Next: Boxed-Eave Gable-End Returns

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View Comments

  1. LauraWilliams | Jan 15, 2019 05:08am | #1

    Very hard working job!!

  2. DeweyMessier | Jan 16, 2019 02:58am | #2

    Very tough work!!

  3. BenjaminShaw | Jan 17, 2019 05:31am | #3

    Very nice!

  4. KevinHuggins | Jan 25, 2019 03:16am | #4

    Well done!

  5. RWM55 | Jan 27, 2022 01:18pm | #5

    I never understood the big deal about the "pork chop" return. Flat soffits are much easier to maintain in the bug-ridden south and the pork chop end treatment is quite common.

    Like they say, "There's no accounting for some people's taste"...

    1. darinvee | Jan 27, 2022 04:46pm | #6

      Who does this guy think he is? The vast majority of soffits in my area are his so called "pork chop" version. Build what you like, but quit thinking "your way" is the best. My family of builders have a saying we live by "you skin your cat, I'll skin mine".

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