The Shed Roof

Modern Exterior by San Francisco Architects & Building Designers

There are few architectural elements in a home that suggest “traditional” or “contemporary” as strongly as roof shape. Ask a child to draw a house and you’re likely to get a box capped with the classic gabled roof. So too the flat roof and its association with contemporary architecture. The shed, or single-slope, roof lies between. Neither entirely contemporary nor completely traditional, it brings to mind images of the woodshed or toolshed — classically informed, but contemporary in its utility.

For an architect, the selection and design of a roof form has less to do with signifying modern or traditional and more to do with determining what that roof can do for the interior space, how it can actively respond to the local climate and site conditions, and the specific requirements of the homeowner. The shed roof happens to be a particularly adaptable solution — and here’s why.

Structural Simplicity

Shed roof forms are inherently simple from a structural standpoint. The roof loads are transferred to the exterior walls, which either act as load-bearing walls or, as in this example, are supported by simple beams and columns. Depending on the interior room shape desired, the shed roof can transfer these loads to the bearing points using trusses, a combination of beams and purlins, or simple roof rafters spanning from eave to eave.

Each variation offers more or less interior detail. A series of regularly spaced rafters (spaced roughly 24 inches apart on center) across the ceiling here displays the structural logic and lends a richly textured cap to the room. It’s also great for a room’s acoustics.

Here the architect has hidden the structural framing to create a clean, minimalistic aesthetic that helps to maximize the amount of reflected light.

Choosing whether to express the structure inside has an impact on the insulation too. In this example the depth of the framing members can be filled with insulation, and it’s concealed by the ceiling finish. Exposed framing requires the insulation to be placed above the plane of the interior ceiling, resulting in a thicker roof build-up.

Site Responsive

When architects talk about a building being site responsive, we mean that its shape and layout are informed by the particulars of a given place. Depending on the site, that can mean many different things. A sloping topography, distant views, a significant boulder or tree, the climate and solar exposure are all things to which we can respond, and the shed roof offers unique opportunities for each.

Topography. Mirroring the surrounding topography with the roof form, as this project does, reduces the scale and visual impact of a home on the site. It fits an overall idea about fitting a home to a place.

Using the roof form to oppose the slope distinguishes the building form and opens up different spatial opportunities. Here it’s used to insert two full floor levels on the downhill side.

Passive solar. The shed shape is an efficient means of addressing a given latitude’s solar concerns. In northern climates, positioning the low eave of the shed toward the north minimizes the building’s surface area and heat loss on a cold exposure. The tall wall — the shed’s peak — would face south to collect the sun and passively heat the space.

In hot climates the shed can be oriented to minimize heat gain from southern and western exposures while still permitting plenty of indirect daylight.

With large amounts of south-facing glass, special care must be taken to prevent overheating. This is true for all climates, as these windows can introduce great quantities of heat into a home year-round.

Adding louvered slats to the exterior, as in this project, can thoughtfully modulate the heat gain. The slats here are designed for a specific latitude to cut off the high angle of the summer sun and admit the low angle of the winter sun.

Using an interior light shelf with a shed roof is an excellent means of controlling both daylight and heat gain. The shelf helps to diminish the scale of the tall exterior wall and provides a comfortable frame of reference near eye level inside.

Overhangs are another passive design element that can help keep the heat from reaching the interior. They can be sized to shield direct heat gain during the hottest parts of the day while allowing light in and views out. This large overhang with expressed framing is a thoroughly modern, honest and functional aesthetic.

Daylighting (clerestories). With its raised peak, the clerestory window band is one of the most common types of glazing used with shed roofs. They make passive solar heating and daylighting strategies possible.

With floor-to-ceiling glass, the roof appears to hover and the entire room seems to be a part of the outdoors. The more daylight we can capture, the less we have to rely on artificial lighting sources.

Weather protection. While we can design any roof to adequately keep out the weather, the shed has a few benefits that other shapes don’t. The wedge shape has a clear front and back side that can be used to buffer prevailing wind patterns, and to direct water and snow away from walkways, entry points and gathering places. In this way the roof form delivers on its name, shedding the undesirable elements from the places we use most often.

The depth of the roof overhang affects just how much weather the nearby interior spaces are subject to as well. Deep overhangs can help mitigate the risk of water infiltration, especially at the more vulnerable large glazed areas we see in many of these examples.

Rainwater harvesting. While the roof protects, it can also provide. It can efficiently gather rainwater and direct it to a single point of collection to be used for irrigation, or can simply channel it away from the building’s foundation.

Directional (views). The form of the roof as viewed from inside naturally directs our eyes up and outward. Here the roof is used as a dynamic directional element, focusing us toward a spectacular view. Contrast this with gabled and flat roofs, which are inherently more static and inward looking.

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