Gable Roof Eave Detail

I recently built a small outbuilding with a 6 in 12 pitch roof that offers a perfect example for showing the process i use to build eaves and rakes.

Gable roof eave detail.

The eave roof and gable. Eaves with over fascia ventilation. Normally down though small up flows occur by capillary action. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley.

Gables typically provided an 8 200 mm overhang and were lined to the underside but there were wide variations in how the top or apex of the gable was treated figures 2 7. Flashing 1 is a typical apron roof flashing. Set top of fascia board at correct level and fit ventilator in accordance with manufacturers recommendations. They were typically used above the bay windows but a small number of hipped roofs over bay windows were also built.

Refer to my architectural roof types blog. This is the portion of the roof that protrudes beyond the side of a house or building. Start with the rafter tails the main component of any eaves detail is the rafter tail the part of the rafter that extends beyond the exterior wall. Remember the roof on the return is there just to shed a small amount of water.

The sequence of assembly of flashing such a junction is critical to achieving a weathertight detail. An eave is defined as the edge of the roof that overhangs the face of a wall. In contrast a gable or rake is the overhang of a building that occurs on the side that is topped by a gable roof. Eaves courses of tiles should be at same pitch as general tiling.

Figures 2 a c show the sequence for flashing the junction between the gable and ridge where there is no eave. 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. I prefer to install the gable drip edge under the felt though that detail is less critical than at the lower roof edge or eaves. Figure 3 shows the shapes of each of the flashings and how they should be folded.

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. Gable end details for closed eaves. When understanding all metal flashings on buildings it makes sense to consider the direction in which water wants to flow.