Design Workshop: Modern Handrail Details

What to know about material, shape and customizable options when designing a handrail

To find the essence of something and express it honestly with as few elements as possible is something designers aspire to. The sheer number of decisions to be made when designing a home dictates that some items be no more than they’re required to be, but the notion that design should get out of the way is a paradox of sorts. The outwardly simple often consumes disproportionately more design labor to execute.

In the design of stairs and their details, informed minimalism makes good sense. We prioritize safety and function first and foremost, and our building codes dictate many of the dimensions we must use. The width, tread run, riser height, guardrail and handrail conventions, and even a handrail’s cross section and circumference are regulated. Within those safety and functional constraints, the following modern examples still manage to delight the senses.

As a general rule, a handrail is required in residential construction on any stair with three or more risers. It must be present on at least one side of the stair at a minimum height of 34 inches but no more than 38 inches above the front of the tread.

Stairs exceeding 30 inches in height and open on one side also require a guardrail. Typically guardrails are required to be 42 inches high with openings no larger than 4 inches in diameter. Many jurisdictions allow the handrail assembly to double as a guardrail, as it does in this image, in which case it can be positioned at handrail height (34 to 38 inches). (Consult your local code requirements; they may be more stringent than this.) Where possible, this is the preferred method, because there are fewer overall parts required.

The basic decisions regarding any handrail design fall into a few general categories.

• Custom, standardized, hybrid: Will the design be tailored to a specific design goal, or will it be made of standardized components, or both?
• Material: Wood, metal, glass, rope, hybrid
• Shape: Round, rectangular, square, custom
• Support: Brackets, wall, floor, self-supporting, hybrid

Custom Solutions


Because stairs are inherently unique elements, they often require a customized design to ensure that a project’s precise design objectives can be met. In tight spaces, custom solutions make the most sense, because they maximize the functionality within the given parameters.

The stair shown here is openly expressive of the code constraints dictating its design. The last 30 inches of the stair don’t require a guardrail, so it has been omitted, opening up the space. The handrail, however, is required to be uninterrupted for the full run, so it continues on. It has also been designed to conceal the functional need for lighting the stairway.

Choosing a custom solution doesn’t necessarily rule out the use of standardized components, like the flat bar stock comprising the handrail supports in this design. It only marries them more precisely to the design condition. Using standard-size components helps to make it more affordable.

Material

Selecting a material that supports the overall aesthetic sensibility of the project is important. I think material decisions should reflect a certain overall design logic — all the hardware is metal, or all the walking surfaces are wood — something that gives the material a reason for being. Other considerations that might inform material choice are its tactile qualities. Handrails are one of those elements that we touch all the time, so they’re a great place for an upgrade to a more luxurious material. A warm, oiled wood is an excellent choice.

Metal is popular because it’s easily fabricated and worked into the twists and turns of stairs. It also has a slender profile, so it has minimal visual weight. Raw steel can be oiled and waxed, and is appreciated for its natural imperfections.

Metal can be polished, sandblasted or brushed for varying levels of refinement. The modernist in me always prefers to highlight the natural properties of the material rather than conceal them. In other words, forget the paint.

Iron and galvanized pipe sections don’t fit with every interior palette, but when they do, they’re one of the most economical choices available — easily sourced and installed.

Glass is a minimalist solution, especially when it can double as the guard and handrail.

Wood is especially great for straight stair runs. Complex stair geometries and wood are compatible, but this choice certainly is not economical. Makers of products like Bendywood have sought to address the complex bending requirements of convoluted stair handrails, but twisting stair runs are still laborious and expensive endeavors in wood.

Mixing metal and wood allows the strengths of each to be maximized. Use steel where its lightness and strength can be put to work, and wood where its tactile qualities can be appreciated.

Material options are virtually limitless. Here a cable from a ski lift has been repurposed.

An informal and perhaps slightly less practical version of the previous example, rope can be appropriate in some cases.

Shape

Wed to the material choice is the question of cross-section or shape. Most people find round profiles to be the most comfortable. Square and flat follow on the comfort scale. Care should be taken to ease any sharp corners. For round profiles, codes mandate a minimum cross-section diameter of 1¼ inches, not to exceed 2 inches. For other shapes they specify a minimum perimeter of 4 inches but no greater than 6¼ inches and a maximum cross section of 2¼ inches.

Support

When you’re choosing the support system for the handrail, the location will come into play. Less than 30 inches off the adjacent floor, this handrail is designed to support itself and provide a basic level of protection without the guardrail’s design restrictions. Self-supporting handrails reduce the usable width of a stair, however, so they’re usually not for confined spaces. They can make great retrofit and outdoor options, though. A number of the previous examples we’ve seen are self-supporting and by nature are more open. But perhaps the most common support when a stair has walls confining it is the bracket.

The choice among off-the-shelf brackets can be overwhelming, but they’re usually the least expensive of the options. I typically specify brackets made of solid metal, either cast or fabricated. I find that these actually give you a sense for the material’s thickness and weight; they look and feel substantial. This example features exposed fasteners that add a fine layer of detail and honestly express its means of attachment.

Concealed mounting brackets are another option when the look of expressed fasteners isn’t right. There are a couple of ways a concealed mounting is typically achieved. One is to rely on concealed bolts anchored to blocking placed inside the wall before it’s finished. One can picture how the pieces would be assembled. The bracket would slide over the wall anchor like a sleeve followed by the handrail supports sliding in from the side, and finally secured in place with a set screw.

Another method would be to face-mount the brackets to the wall substrate before it’s finished and cut the finish to fit around it. With gypsum board and plaster finishes, this is relatively straightforward (although finishing around the brackets is tricky).

Both methods involve additional expense, but of the two, the sleeved bracket is generally simpler and less expensive.

There are ways to achieve the concealed look without unnecessarily complicating the construction sequencing. If you keep the materials thin and light and use a surface-mounted tab, much of the aesthetic lightness will be maintained without the additional expense.

Here’s a similar tab design viewed from a different angle. This one has been designed to receive a wood cap rail as the final finish (note the countersunk hole to the left).

 

The viewing angle can conceal face-mounted brackets too. This one has a single mounting lag hidden below the bracket. Seen from above, the bracket appears to disappear into the wall.

There are countless other off-the-shelf options available with concealed fastening too, such as this one from Halliday Baillie. Other good-quality manufacturers are: Linnea, FSB, Deltana, Merit and Julius Blum. What you trade in ease of installation, you pay for in hardware; these brackets are about $100 each.

When sourcing handrail brackets, consider the shape of the bottom edge of the rail material. Less expensive brackets feature flat plates, because they’re easier to fabricate. If your handrail’s cross section is round, this will naturally limit your choices.

There are plenty of glass-mounting options for handrails. My default glass attachment system is made by C.R. Laurence. It has a kit-of-parts feel and a visible logic to it that I quite like.

If a protruding handrail just doesn’t do it for you and you have the room (and budget), consider a recessed rail, which gets out of the way like no other. While building codes allow the handrail to project into the required minimum width of the stair, this design will make your overall stair width even wider. This is because you’re still required to maintain the 36-inch minimum width and also provide the handrail clearances within the recess. It’s not a space saver, but it does fit a space with clean lines. The architect here has in a sense carved the rail cavity out of the same wood used for the cap.

Calling less attention to itself, this regress is painted to match the wall. Only a thin shadowed line at the wall surface is highlighted, allowing the floating treads to assert their importance.

 

Eric Reinholdt

Houzz Contributor, Residential Architect, Founder 30X40 Design Workshop

Design Workshop: The Shed Roof

This popular — and versatile — form straddles the divide between contemporary and traditional styles.

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.

This directional effect can be leveraged to refocus interior spaces away from less desirable views (or neighbors) and toward more optimal ones.

Roof Slope
The slope of the shed roof has important design impacts. For any given horizontal room dimension, there’s a delicate balance between the shorter structural members required for a lower slope and the longer structure required for a steeper slope. Longer spans require deeper framing members, heavier sections or both. When the roof plane becomes thick, it can feel too heavy and hat-like. This project maintains a lean section befitting the proportions of the thin architectural elements used elsewhere.

The roof slope affects the headroom at the high and low eaves inside, as well as how grand the space will feel.

It’s good practice to consider the slope alongside the building’s latitude to achieve the optimal solar exposure, as discussed earlier. Steeper pitches are better in higher latitudes; lower pitches in lower altitudes.

Steep sheds require careful planning inside to maintain headroom clearances at the eaves. In snow country very steep pitches will shed snow even if they’re shingled. Remember to take this into account and use the shape to do the shoveling for you.

With this shed, attic space has been traded for living space, opening up some opportunities, like the loft seen here.

Materials
The roof slope has a direct effect on the materials a shed roof can be covered with. Any slope less than 2 inches in 12 inches is considered flat and must be waterproofed as such. Slopes between 2:12 and 4:12 are generally considered low slope, while those between 4:12 and 12:12 are considered conventionally sloped. Each roof material has its own limitation with respect to roof slope, beyond which it’s either not advisable to use, or special procedures must be followed to install that material. Having said this, with the right budget, (almost) anything is possible.

Modern and Traditional

The formal ambiguity of the shed roof can be a real benefit to those who prefer the look of a more modern aesthetic but aren’t willing to fully embrace the idea of the flat roof. The shed form has both a traditional identity and a contemporary feel, which is why it’s such a widely embraced and versatile design element.

Eric Reinholdt

Houzz Contributor, Residential Architect, Founder 30X40 Design Workshop