The Skeleton Behind the Spirit: The House That Stitzel Built

To view the figures and tables associated with this article, please refer to the flipbook above.

Whether you’ve been swept up in the bourbon and whiskey renaissance of the past decade, watched friends or colleagues immerse themselves in it, or intentionally kept your distance, the tasting ritual is recognizable: a pour slightly heavier than intended (a fact no one will admit) settles into a Glencairn glass, catching the light as it rolls along the curved sides, amber and honeyed, cradled between finger and thumb. A slow turn of the wrist sets the liquid in motion, a swirl to study the legs. A pause. Then a measured breath through the nose, eyes half- to fully closed, allowing the aromas to speak before the inevitable first sip. Another follows, this one for the Kentucky Chew.

Each gesture is deliberate, performed with care, as if the ritual itself might draw the very best from the glass; to make it count. For the Certified Bourbon Steward or the amateur who learned the practice from someone else, the process is central; tradition can matter as much as the final expression.

For a small subset of structural engineers, however, that aroma signals something entirely different. It does not stop at charred oak or caramelized sugars. Instead, it pulls them back to a place most enthusiasts never see, or only glimpse on a guided tour: the iconic wood rickhouse. Not the idealized image printed on a label, but the lived-in structure. Weathered framing, uneven floors that announce each step, and daylight and cool drafts filtering through siding that has expanded and contracted for decades. Faint streaks of baudoinia compniacensis (whiskey fungus) cling to surfaces, a quiet testament to evaporation and the presence of the angel’s share. In these moments, the scent in the glass becomes inseparable from the structure.

For the structural engineer, the experience begins outside a four- to nine-story rickhouse on a cold, humid, or rainy day, catching up with the distillery team whose family-style camaraderie contrasts with the quiet intensity of the structure itself. Their warmth and generational knowledge set the tone: lighthearted and engaging, yet grounded in the understanding that you are there because they have a concern regarding this house. Like an adult caring for an aging parent or grandparent, they tend to the house and its neighboring siblings as if they were their own, guided by a responsibility not only to preserve its life and extend its service, but to honor the legacy and traditions carried forward through generations.

There is always a brief rush of confident yet nervous adrenaline in knowing that no matter how many rickhouses you have entered, each one is unique. Decades of loading, unloading, “modifications,” and environmental forces have left their maker’s mark. Some variations reveal themselves immediately; others remain hidden behind rows of barrels. The structural engineer’s task is simple in concept but rarely in execution: understand how this house has responded over the years and determine what, if any, rehabilitation is needed.

As the front-of-house door opens, the structural engineer steps inside and begins to see the rickhouse in ways most visitors never will. The angel’s share still hangs dense in the air, sweet and unmistakable, though slowly dissipating as fresh air flows in. The focus quickly shifts from aroma to structure. Posts, rails, and braces now command attention; the hidden skeleton that bears the weight of tens of thousands of 500-pound barrels, absorbs seasonal change, and guides the airflow that drives maturation. For the engineer, the rickhouse is as much about vertical and lateral load paths as it is about scent and history. Understanding these systems is key to appreciating how these storied structures endure while supporting both spirit and tradition.

For centuries, American distillers aged bourbon and whiskey in warehouses ranging from barns to ornate brick buildings. Before formal racking, barrels were stacked on floors or simple shelves, leaning against walls or one another. Storage relied on natural airflow and seasonal temperature swings which was inefficient; barrels could become overstressed or damaged.

A turning point came in 1879, when Louisville distiller and inventor Frederick Stitzel patented the “Rack for Tiering Barrels.” His system supported barrels on their sides without stressing the staves and promoted airflow around each one. Each rack carried barrels independently, allowing denser, safer storage and easier handling. While the patent never used the word “rick,” the system is believed to have inspired the term “rickhouse,” now synonymous with American barrel-aging warehouses.

The familiar Kentucky rickhouse emerged: four- to nine-story wood framed structures clad in corrugated metal, exposed to the elements. Upper floors endure hotter summer temperatures, accelerating maturation, while lower floors remain cooler for slower aging. Middle floors offer a balance. Airflow is critical to both maturation and structural preservation, and geographic hills and low-lying sites further influence aging and flavor.

Traditional rack-supported rickhouses did not fit standard building codes. Kentucky gradually developed industry-specific provisions that ultimately culminated in Section 430 of their 2018 Kentucky Building Code for Barreled Spirit Storage Buildings, which allows approved materials outside typical construction type limitation, sets area and height limits, and requires fire separation and spill containment. Section 430.2.2 exempts these rarely occupied structures from IBC/ASCE 7 seismic provisions, recognizing that full seismic design would dramatically alter materials, systems, and cost. Exemption does not remove responsibility: Section 430.2.1 requires the design to carry a licensed Kentucky engineer’s seal, ensuring gravity, wind, load path continuity, connections, and overall stability are addressed.

Today, rickhouses may include fire suppression, mechanized lifts, and engineered racks, yet barrels remain stacked vertically, breathing with the seasons, and supported by wood. From Stitzel’s original patent to modern high-capacity campuses, the rickhouse continues to shape the spirit through airflow, wood framing, and the judgment of those who design and maintain them.

Rickhouses, though slightly varied in layout, are built from the same fundamental gravity-bearing unit: Stitzel’s rick, or rack. As shown in Stitzel’s 1879 patent, the rick is a rectangular frame supported by corner posts. Typical dimensions are roughly 3feet, 6 inches wide (3 feet clear), 6 feet, 9 inches to 9 feet deep, and 7feet, 4 inches tall, accommodating standard 53-gallon barrels (35–36 inches tall, 21–22-inch head diameter, 26–28-inch bilge) while allowing airflow between the 400–550-pound barrels.

Ricks may be configured as single or double units, with two or three posts across the aisle width. Dunnage rails span horizontally between posts to support barrels, notched or let into the posts at third points of the rick height. In double ricks, the center post carries rails on both sides. Rails are eased or canted to match barrel bilges and secured with through-bolts at each post intersection.

Although the rails transfer loads to the posts, the load is slightly eccentric. Middle posts in double ricks generally handle the load well, but outer posts are more sensitive. Removing barrels from the bottom of a full house can create significant structural consequences if not carefully managed, since the center post supports roughly twice the load of an outer post.

The overall house widens as the initial rick is extended lengthwise by adding posts and continuing the barrel dunnage rails, forming a continuous aisle of rick bays. The structure then grows longitudinally as parallel rick aisles are added. Each single or double rick is separated by catwalks, sometimes as narrow as 15 inches, providing workers access for loading and unloading while maintaining operational clearance and airflow between aisles.

As the structure expands in width and length, a recognizable and repetitive overall plan emerges. Typically, rickhouses are organized into two primary sections containing 34 to 68 parallel rick aisles running perpendicular to the house’s longitudinal length, separated by a main central walkway approximately 8 feet wide. This central aisle bisects the house, delineating the left-of-house (LOH) from the right-of-house (ROH). Additional narrower walkways may run interior of the exterior LOH and ROH walls to provide supplemental barrel access. Near the main entrance an 8-foot offset from the first rick aisles is commonly provided to accommodate temporary storage, stairs, and modern escalator lifts.

Near the center of the house, a rick aisle on each side of the center walkway is often omitted to provide a series of longitudinal X-braces, one at each rick post. This aisle bisects the house transversely, delineating the front-of-house (FOH) from the back-of-house (BOH). These braces form the spine of the structure, resisting lateral motion and keeping the structure aligned under longitudinal loading. In larger rickhouses, additional X-braced bays at quarter points enhance overall longitudinal strength and stiffness.

Before building upward, 2x top plates are installed transversely across the tops of the rick aisle posts, aligned with each X-brace. These plates function like ribs or multi-level outrigger arms, connecting posts across aisles and distributing forces from the outer edges of the body back to the spine. Nailed and spliced atop the posts at varying intervals, these single- or double-ply plates stretch and contract like ligaments, helping the structure breathe and dampen movement. They also act as drag struts and collectors, linking all rick posts and exterior walls to the spine while providing a transition between levels.

Sway bracing is installed perpendicular to the X-braces on each side of the center aisle. These braces act as transverse spines, increasing stiffness across the quadrants. Typically comprised of a single 4x or larger member, these braces connect to posts and intersecting barrel rails using toenails and through-bolts, interlocking rick components across and between levels.

Barrel rails function as the rickhouse’s skeletal ligaments, binding the frame and coordinating load transfer between posts, braces, and tiers. While typically not a primary lateral load path, they provide secondary continuity and restraint within the system. Their rigid through-bolt connections act as tendons, tightening the system and locking the framing for added stability and load sharing.

The center aisle itself is not reliably rigid but provides a limited connection between the individual transverse systems for continuity.

Typically installed at every other rick bay, sway braces are configured as either stacked “A” frames spanning from aisle to exterior wall or two bay wide X-braces. Horizontal 2x braces may be added at floor levels as diaphragms, but most systems rely solely on the 2x top plates.
With the spines, ribs, arms, ligaments, and tendons in place, the structure is ready to grow vertically. Seat-supported beams span the center walkway at aligned posts, and flat 2x decking forms the walking surfaces. The process repeats tier by tier to the roof, where column heights step down toward the exterior walls to promote drainage and interior airflow. Roof and side walls are furred with 2x members and clad with lightweight corrugated metal panels. This outer shell shelters the interior while allowing the structure to breathe, supporting barrel maturation through ventilation and seasonal change.

Posts and braces transfer concentrated loads from the interior dunnage system and the exterior environment to wood sill plates bearing on concrete kneewalls supported by continuous strip footings that run from FOH to BOH. X-bracing typically terminates at the top of the kneewalls, while sway bracing often continues to the tops of the foundations, though not in all cases.

The kneewalls serve several purposes: elevating posts above grade to reduce soil and moisture exposure, promoting airflow beneath the structure and creating channels that manage incidental water or other moisture intrusion. In the event of catastrophic failure or fire, the kneewalls and perimeter foundation walls help contain and direct flammable alcohol toward designated relief zones.

The slab or finished grade between kneewalls is graded to facilitate positive drainage. Liquids are conveyed through outlets or drainpipes to a primary retention pond, a secondary pond, or other approved discharge points in accordance with local code.

This foundation system supports the weight of the house above, transfers forces from posts and braces to the soil below, and regulates the movement of fluids through the crawlspace. By combining structural support with moisture and emergency drainage management, it preserves the integrity of the structure while safely managing potentially hazardous conditions.

Due to the limited tension and shear capacity of typical nailed connections, rickhouse bracing is assumed to behave primarily as compression-only members within the lateral system, a behavior that may feel unintuitive for a profession more accustomed to tension-only or tension-compression braced systems. Under longitudinal lateral loads, one diagonal of an X-brace engages in compression while the opposing diagonal remains largely inactive. The active brace bears at its ends, transferring load into the posts and 2x top plates. With limited tension capacity in the opposing brace connection, the system relies on the 2x top plates to drag lateral load across the bay to engage the opposing compression diagonal brace below.

When lateral loading reverses, the previously compressed brace unloads and the opposing diagonal must engage. Engagement may be delayed by construction tolerances such as small gaps at brace ends, gaps in the 2x plates, and fastener slip. These conditions must be overcome before compression bearing develops, creating initial drift before the system stiffens. Over repeated cycles, this ratcheting behavior can lead to incremental displacement and gradual lean.

The angel’s share further accelerates this behavior. Ethanol evaporation produces humid, chemically aggressive conditions that promote fastener corrosion and connection deterioration. Seasonal swelling and shrinkage of wood loosens nails and reduces connection stiffness, while insects and fungal decay can reduce the cross-sectional capacity of braces, posts, and sill plates, lowering stiffness and increasing response time of the lateral load path.

Barrels also shift slightly during loading, unloading, and wind-induced sway. The motion is subtle yet perceptible, like a heartbeat passing through the frame, reminding that the structure and its contents respond together to internal and external forces. This cyclic movement can further encourage connection slip and cumulative displacement.

Since 2x top plates are spliced over posts without full continuity, joints can widen under high lateral loads, opening gaps between their ends. Similar separations occur at the ends of X-braces, particularly at brace ends that have previously undergone load reversal. These gaps act like a stretched ligament, reducing joint effectiveness. As gaps grow, compression load paths between story-level diagonals are interrupted, and additional lateral movement is required before bearing is restored, further reducing the already temporarily limited stiffness and increasing the likelihood of progressive lean.

Localized separations can evolve into frame-level distortions and accumulate into perceptible global lean. Over the decades, posts may lean as the frame adjusts to the loads above. Once displacement occurs, gravity from stacked barrels can lock the structure into the displaced geometry. If separation at a 2x top plate widens sufficiently without intervention, partial unseating from its bearing support may occur, potentially initiating localized instability.

Determining “excessive lean” in historic rickhouses is challenging. Unlike modern engineered structures with defined drift limits, many were built without serviceability criteria. Minor out-of-plumb conditions may remain stable for decades, but concern arises when lean is accompanied by gap formation at brace joints, crushed bearing at posts, top plate separations, or progressive displacement. Lean becomes unacceptable when it alters gravity load paths, reduces brace engagement, obstructs barrel movement, or increases the risk of member unseating. Monitoring displacement trends over time is often more reliable than a single measurement; full-height plumb bobs are commonly used to track global lean.

Transverse sway bracing exhibits similar limitations. While through-bolted barrel rail connections improve load sharing and redundancy, toe-nailed braces at post interfaces have limited tension capacity. Field observations of houses with side lean frequently reveal gaps at these toe-nailed connections, indicating incomplete brace engagement during load reversal.

Repairs focus on restoring structural continuity, eliminating gaps, and introducing reliable tension capacity where needed to return the house as closely as possible to its original design intent. Much like treating a chronic condition, each intervention is performed deliberately, with the goal of leaving the structure incrementally stronger and more stable over time. Typical interventions include reinforcing or sistering leaning posts, installing steel straps or tie rods to provide positive tension resistance, tightening or through-bolting brace connections, adding supplemental bracing, full member replacement, and replacing deteriorated sill plates or kneewall components. At sloped or overstressed posts, additional posts, blocking, or localized shoring may be required to reestablish plumb alignment and proper bearing.

Correcting gaps at top plates and restoring effective brace end bearing stabilizes leaning frames, allowing braces to engage more immediately under load reversal and improving quadrant-wide stiffness. In many cases, reinforcement can be staged to minimize operational disruption, letting barrels remain in place for much of the work. If barrels are left in place, fixes must be executed without creating sparks. In more severe cases, however, the lean may require the house to be emptied and carefully racked back toward plumb before reinforcement is installed. Even then, wood often retains a memory of its previous deformation and may gradually trend back toward its former position. When properly designed and executed, these repairs restore system reliability while preserving the airflow characteristics essential to barrel maturation.

For most bourbon and whiskey enthusiasts, the rickhouse is a backdrop: a setting for tastings, tours, and labels. For those who study these structures, however, the experience begins with structure as much as spirit. The house shapes the environment in which barrels mature, bearing immense weight while guiding airflow and seasonal changes that drive aging and the angel’s share. Each sway brace, X-brace, top plate, and post forms a coordinated system, balancing vertical and lateral forces while quietly supporting tens of thousands of barrels above. Every engineer who studies or repairs one leaves their quiet mark on the structure, even if few ever notice.

Walking through a rickhouse, floors creak underfoot, posts lean slightly but deliberately, and the scent of aging spirit mingles with the warmth of decades-old wood. The barrels themselves are never completely still. They shift with loading, unloading, and wind-induced sway. The structure moves with its contents, shaped by human ingenuity and the steady passage of time.
Many distilleries recognize that their rickhouses have long exceeded their intended service life. Maintaining them is much like caring for a vintage car: every joint, post, and brace demands attention, and small misalignments can compound if ignored. Preserving them protects both tradition and the decades-old wood that will support future barrel generations.

The story of bourbon and whiskey is inseparable from the story of the rickhouse. The spirit matures within its walls, but the structure governs the conditions that shape it. To fully appreciate the spirit in the glass, one must also appreciate the skeleton that supports it. In a rickhouse, craftsmanship is found not only in the barrel or the distillate, but in the home that holds them, quietly and subtly rocking the flavor of their history.

Perhaps a quiet nod to Mr. Stitzel is in order … ■

About the Author

Benjamin Wagner, PE, SE, is a Senior Project Manager with Schaefer and current President of the Indiana Structural Engineers Association (ISEA). He has had the privilege of working with numerous distilleries to extend the service life of their rickhouses.