What’s the safest way to incorporate glass in a horse barn? If you’ve been following our work, you already know that Blackburn Architects’ mission is to promote as much natural light and ventilation in horse structures as possible. Naturally, this means we add a lot of windows to our designs. In its safety recommendations for the stable, Rutgers NJ Agricultural Experiment Station cautions that “windows need to be inaccessible to horses and livestock, covered with bars or screening and made of safety glass.” (https://esc.rutgers.edu/fact_sheet/safety-recommendations-for-the-stable-barn-yard-and-horselivestock-structures/). So how do our architects protect the horses and still use a lot of glass in our designs?
1. Use Tempered & Laminated Glass
We recommend that all glass in a horse stable be tempered, including glass that’s laminated. Tempering and lamination do two separate but similar things to increase the safety of glass if/when it breaks: Tempering makes the glass break into small chunks as opposed to slivers and shards, while the lamination gives the glass a slightly greater resistance to breaking and keeps the glass in place when and if it breaks.
Laminated glass consists of a clear plastic laminate sandwiched by glass on both sides. Since horses have access to both sides of a glazing unit, ideally both sides should be laminated and tempered. If this approach is too costly for your budget, stick with everything being tempered and omit the lamination. Laminated glass does not always age as well as tempering. The laminate can shrink and pull in from the corners of the glass, and eventually become visible over time. We prefer tempering.
2. Minimum Thickness of Glass and Airspace
To arrive at the minimum thickness of glass, work backwards from the depth of the frame, minus about 1/4”. Each glass manufacturer determines what spacer sizes they offer. Understand that the more airspace you can allow the better, but each manufacturer works with a few different pre-set size spacers. Use the largest one that still allows the glazing unit to fit within the frame.
3. Special Considerations for Cold Climates
In cold climates, we specify glass with a high solar gain and low emissivity. In technical terms, the glass meets the following guidelines:
1. A Solar Heat Gain Coefficient (SHGC) around 0.55
2. A U-value of less than 0.33
3. A higher value Visible Transmission (VT)
4. Use double-paned glazing units with low-e gas that has a vacuum sealed gasket between the panes of glass. The pocket between panes of glass is filled with an insulation gas, most typically argon.
5. Consider using low emissive (low-e) glass panes (low-e prevents the transfer of heat from warm to cold). The low-e coating (typically a metallic oxide) should be on outside of the innermost pane of glass.
There are pros and cons that should be considered with each option 1-5 above. For instance, with #4, over time and if the gasket seal fails, you can begin to see condensation between the panes of glass. Whereas with #5, you may be able to see the coating from certain angles, especially if you are wearing polarized sunglasses. Since the advantages are a bit more obvious, and similar to one another (i.e. tempered vs laminated, and low-e gas vs low-e coated glass), here is a summary of some of the disadvantages to each option:
Tempered only – glass may still shatter (in harmless pieces) and fall to the ground.
Laminated only – laminate can discolor over time and shrink in from the corners of the glass.
Low-e gas filled glazing unit – if the gasket fails, condensation can form in between the glass.
Low-e coated glass – may be visible in certain light conditions, or when wearing polarized sunglasses. You can sometimes see this on automobile glass.
To summarize, a good starting place for adding glass to your barn begins with tempered glass, meeting the SHGC and U-values recommended above. A step beyond this is low-e coated glass, since with #4 (low-e gas) you can expect the gaskets to fail at some point, and the glazing unit will need to be replaced. If the coating of the low-e coated glass is too “visible,” then low-e gas may be the better option, with the expectation that you may need to replace some of them again in 10 to 20 years, if and when the gaskets fail.
In this on-going series, John Blackburn offers insight into component parts of equestrian facilities. With more than 35 years’ experience in the design of horse barns, he’s seen his share of good, bad and worse. In this installment, he gives advice on stall flooring. Still as applicable as ever, we’re reposting Sushil Dulai Wenholz’ article from The Horse, Sept 1, 2001 (added a few updates, too).
By Sushil Dulai Wenholz
You give a lot of thought to your horse’s health and happiness. You groom him until he gleams, swaddle him in boots and blankets, carefully monitor his diet, and expend considerable effort and expense making sure he’s comfortably bedded. But have you thought about what lies beneath that soft bed? In essence, the stall floor is the box spring beneath your horse’s mattress, and it’s every bit as important as what goes on top–perhaps more so.
No matter how nice the bedding, a poorly constructed floor can lead to respiratory troubles from ammonia gases, thrush from trapped moisture, achy joints from uneven or too-hard surfaces, and injury from slippery or abrasive materials. In addition, a poor floor can mean wasted bedding and extra labor for you.
A good stall floor starts with a good construction plan. John Blackburn, senior principal of Blackburn Architects, a 34-year-old firm that has designed more than 400+ barns in 35 states; and Peter Gibbs, Extension Horse Specialist at Texas A&M University, outline the steps involved in building a floor that will keep you and your horse happy, whether you’re revamping an existing stall or building a brand new barn from scratch.
Starting From Scratch
1. Pick the location. If you’re building a barn, you have the luxury of choosing the best site. Look for an area that’s dry or at least easy to drain. Avoid steep slopes, areas that are consistently wet, and locations that are subject to water runoff during heavy rains or snow melt. In terms of soil, you’re basically stuck with whatever is normal for your region. But if you have it, soil that packs tightly is ideal, says Blackburn, because it will provide a tough surface that isn’t too hard or abrasive.
2. Dig to the base. Whether you’re starting from scratch or redoing an existing stall, you need to dig down to a well-draining layer of soil. This will give urine and other moisture a path to drain away from your horse. Expect to excavate at least one foot deep over the entire stall, says Blackburn. You might have to go deeper, depending on local soil conditions.
3. Level the ground. You should level out that base layer to help make sure the surfaces above it are level. A nice, even plane puts less stress on your horse’s legs than an uneven floor.
4. Compact the base and fill. Even if the floor starts out flat, Gibbs explains that extended use can create a holey or uneven surface, especially with dirt or stone-dust flooring. To form a firm foundation that can withstand daily wear and tear for extended periods, compact the floor. You can use a hand roller, a motorized, hand-held compactor or “settler,” or some other heavy pounding tool to do the job.
First, compact the layer you’ve uncovered and leveled. Then begin adding layers of dirt or stone dust. “The important thing is to install the flooring in layers and tamp it at each layer,” says Blackburn. He recommends using three-inch layers for dirt or one- to two-inch layers for stone dust. Compact each layer “until you think it can take the abuse of hooves kicking at it,” he adds, noting that there isn’t a standard measure to go by.
To ensure good drainage away from the building, add layers until your floor’s surface is 12 to 18 inches above the natural grade around the barn, says Blackburn. “You want to get the moisture to drain through the flooring and away from the stall and barn,” he explains. In addition, this protects the floor from high water levels outside that might otherwise easily flood the stall.
Now you’re ready to add the floor itself. Next you’ll find basic installation information for several common types of flooring.
Adding the Flooring
Dirt–If you plan to have a dirt floor, and local soil drains exceptionally well, you’re done. Most soils, however, drain moderately well at best, so you’ll probably want to help it along. One option is to grade the top layer of dirt slightly (no more than three degrees), so that moisture runs off to exit the barn or stall through an outlet in the corner (or through the stall door to the aisle).
You could also make a “leach hole,” or simple drain, inside the stall. To do this, dig a hole about three feet in diameter and deep enough to reach that bottom, well-draining layer of soil at the base you created. Then fill the hole with varying sizes of rock (or alternating layers of sand and gravel), starting with large gravel chunks at the bottom and working toward stone dust at the top. Tamp into place and cover with dirt to even out the floor.
Stone Dust–Blackburn believes that stone dust (also known as crusher run, screenings, or quarter-inch minus) makes a better floor than dirt, “because it can compact well and still permits drainage.” However, he does recommend adding a subsurface drainage system to enhance flow-through. To do this, lay filter fabric over the floor, top it with a layer of crushed gravel, then add three to five inches of stone dust. As you did with the base, compact the stone dust after each one- to two-inch layer. When you’re done, water the floor, tamp it down tight again, and let it settle overnight. Fill in any holes or depressions the next day.
Another idea is to install a drainpipe under the stone dust floor. “I feel that this helps drain the moisture away from the stall area and allows you to flush the stall with moisture to cleanse the flooring,” explains Blackburn. “Otherwise, it could drain into the dirt and stone and stay there, providing odor and a breeding ground for bacteria.”
To lay pipe, first dig a swale–a sloped ditch about one foot deep. Lay perforated pipe into the swale (you want a piece long enough to provide drainage away from the building, notes Blackburn). Cover the pipe with filter fabric, then fill the swale with crushed gravel. Now add and compact your stone dust as stated previously.
Plastic Grid–Plastic grid flooring comes in many variations, but the basic idea is the same for all floors: To provide a 100% permeable floor plus a level, stable, durable surface. Installation instructions vary by manufacturer; however, most recommend laying the grid over a well-draining subsurface (such as stone dust) so that moisture not absorbed by bedding will drain away. Usually, the holes in the grid (which create the excellent drainage) are filled with stone dust.
Rubber Mats–As with grid systems, rubber mats (and similarly, rubber pavers, which look like rubber bricks) vary in design, thickness, texture, etc., from one manufacturer to the next. Likewise for installation instructions, although most want you to measure stalls so that mats fit snugly against each other and the walls. Unlike grids, however, mats and pavers are meant to trap moisture above the surface, where it can be absorbed by bedding. Moisture can seep through the seams (or possibly the rubber itself). So, flooring experts recommend that you lay mats over a well-draining subsurface, such as one of the crushed stone systems mentioned earlier, or over relatively nonporous materials such as concrete and asphalt that can be easily disinfected.
Asphalt–You can lay an asphalt floor yourself, if you’re willing to find a supplier, rent equipment, and learn the proper way to apply, rake, and settle it. However, it can be a tricky process. As Blackburn notes, “The right mix of asphalt is important. It should be raked as it’s installed, then hand rolled. I would imagine that hiring a professional would be advisable.”
He also suggests that you grade asphalt floors with a crown of one-eighth inch per foot in order to sustain drainage. “With a flat surface, the urine puddles and leaves the horse standing in dampness, potentially causing all kinds of hoof issues,” he explains. The slope will also facilitate drainage when the stall is washed or disinfected. Blackburn recommends the use of aggregate, or “popcorn,” asphalt, which offers a non-slip texture. And he strongly urges the use of rubber mats or rubber pavers to cushion this relatively rough surface.
Concrete–Many people are comfortable mixing and pouring their own concrete–an easier process than laying asphalt. For larger projects, you might want to hire outside assistance. Although moisture can seep through concrete over time, this footing is not as porous as stone dust. So, Blackburn recommends grading it at a rate of one-eight inch to one-quarter inch per foot to allow for drainage. Concrete should be cushioned with rubber mats or pavers, he adds, to reduce the risk of injury and musculoskeletal stresses that this hard flooring could cause.
A Note on Cost
Before you begin stall floor construction, you should create a budget for the project. However, as Blackburn notes, “The cost of different options can vary dramatically based on the number of stalls, location, and the material used,” as well as the specific suppliers, consultants, and equipment rental agencies with which you might deal.
For instance, says Blackburn, “I have found that the cost of asphalt flooring can range widely from area to area. And some suppliers require that a large quantity be ordered of the type and mix you need before they will supply it at a reasonable price.” Therefore, it could actually be more expensive, per stall, to floor a smaller barn than a larger barn. It’s important to contact local companies for estimates before you start the job. (For mass-manufactured, nationally distributed products like most rubber mats and plastic grid systems, you can check pricing with the manufacturers, many of whom have web sites.)
As you start compiling price quotes and creating a budget, Blackburn cautions that you consider not just the initial expense of purchase and installation, but also long-term costs. A dirt floor might be virtually free to install except for labor, but could be expensive in terms of labor over the long run. Rubber mats might be pricey at the start, but could pay for themselves through longevity, ease of care, and reduced bedding.
Also consider the stall flooring material can greatly impact the amount of bedding you’ll need to use. For instance, a stall floor with interlocking rubber brick can cut your bedding in half which can save on barn operations, offsetting increased installation costs.
Additional options for flooring include adhered cushioned or foam filled. To conclude, all stall flooring has an impact on the comfort of your horse, the material cost of installation, bedding requirements and your ability to clean and sanitize the stalls.
ABOUT THE AUTHOR
Sushil Dulai Wenholz
Sushil Dulai Wenholz is a free-lance writer based in Lakewood, Colo. Her work appears in a number of leading equine publications, and she has earned awards from the American Horse Publications and the Western Fairs Association.
1. Blackburn designs stalls of all sizes, but the most common is 12’x12’. 16’x16’ is often requested for larger horses, but with more space comes increased maintenance, a need for more bedding and a bigger area to clean. Larger stalls can, therefore add considerably to the cost of building a barn by:
a. Adding to the overall length and/or width of a barn.
b. Requiring roof framing to be increased from 2×10’s to 2×12’s or even greater.
c. Increasing the span of the framing lumber.
2. Partitions between stalls should be at least 8 feet high, but they don’t have to be solid from top to bottom. Barred or mesh portions on the top enhance ventilation. This also has the benefit of allowing horses to see their companions — and provides easy observation of the horses by their owners. The down side is the increased ventilation between stalls can increase the risk of bacterial infection between horses. For the same reason, doors that are open on top increase light and ventilation. Bars must not be more than 2 to 3 inches apart, and openings should not be more than 2 inches across to prevent hoof entrapment.
3. Steel mesh or bar fronts on stalls allow an owner to look down the aisle or into the stall as they walk down the aisle and see their horses. The mesh is good for ventilation, too. The drawback is that bedding can be kicked into the aisles, so we recommend adding bedding guards. Welded steel mesh is typically stronger than bars but the horizontals tend to collect dust and can add to barn maintenance.
4. Doors should be at least 4 feet wide. This is wide enough for a wheelbarrow to enter the space or for a horse and handler to exit or enter the stall. Sliding doors are preferred over swinging doors. If you must use swinging doors, remember to install them to swing outward. You’ll have a major problem if a horse goes down and the door swings to the inside. Additional safety reasons for outward swinging doors include:
a. Prevention of an unlatched door swinging open accidentally, or the wind catching it.
b. Added visibility of looking down an aisle and recognizing that a stall is open and empty. (Handlers need to leave stall doors open when the horse is turned out. This also makes it easier when bringing the horse back to the stall – you don’t have to open it.)
5. We recommend rounded edges in stalls and anywhere in the barn where horses have access. A casting rail (which can be a groove in the wall or a 2-by-4-inch rail bolted low to the wall), provides something for the horse to catch his foot on when rolling to avoid getting cast.
6. Provide for easy access to the stall for feed buckets without opening and closing the door. Place in one of the front corners adjacent to the aisle.
7. Automatic waterers have the advantage of offering constant fresh water, but be sure to buy a model that is easy to keep clean. If you don’t want automatic waterers, install water hydrants between every couple of stalls and provide for ample drainage for drips and overflows. Don’t forget to frost-proof them in climates where pipes are apt to freeze.
Hi John. I hope you had a wonderful summer!
Q: Our covered arena has been put to good use throughout the last year, but we really need lights to make it even more beneficial to our program. Given your expertise and experience with equestrian barns and arenas, I was hoping you might be able to give us some guidance.
We are having a hard time determining exactly what kind of and how much lighting is necessary. Do you have a formula that you use?
Any help you can provide would be greatly appreciated. I look forward to hearing from you!
Dear Undercover Rider:
Glad to hear all’s well.
I would be happy to offer some guidance on lighting for your arena.
A: I typically recommend approximately 35 to 50 foot candles per sq ft of light on the arena floor in order to provide a sufficient amount of light for a variety of functions. It also depends on the amount of reflective surfaces you have and the color of those surfaces including the arena floor material.
If you are anticipating a variety of entertainment type functions such as charity events, parties, etc you may want to consider a variety of type mood lighting for different events.
There are also a variety of type lights to consider such as metal halide, LED, HD, etc.
There are other factors to consider as well such as initial cost, operating cost, maintenance or lamp life and also the design of the fixture (bird protection, fire safety, etc.)
We are beginning to use LED more often now. I hope that helps!
In case you missed it… Studio Appalachia is a collaborative, project-based graduate design studio between Clemson’s school of architecture and its department of landscape architecture. The Studio is directed by associate professors Dan Harding and Paul Russell. Studio Appalachia targets issues such as: accessibility to natural resources, sustainable building strategies, and approaches to long term visioning and planning.
I was asked to participate in this year’s studio because it involved horse facilities, specifically re-envisioning the Clemson University Equine Center (CUEC). With aging facilities that are well-used and well-loved, I knew it would be fascinating to see how these talented students created a fresh program for the facility. The teams of architecture and equine business students (a new twist for the studio) have spent the last several weeks immersed in detailing the site and facility requirements, learning about design issues unique to equines.
Teams consisting of three to four students conducted rigorous research, made several site visits, interviewed user groups, studied topography, considered land, sun, wind, circulation paths and traffic flow to create detailed and well considered Master Plan Studies and Field Reports.
Referencing the evolving formal and material contexts of Southern Appalachia, the four teams stated as goals to “improve circulation, establish organization, and enhance the (existing) ecology of the historic Clemson farm. To them, as one team eloquently stated, the CUEC is more than a farm; it is an institution that showcases the prestige of the university, and embodies the history, strength, and energy that the equine program was founded on.
The preliminary master plan schemes presented earlier in October were successful in developing goals and considerations for further study. The studio presents preliminary concept designs later this week and I’m looking forward to the big reveal.
Over the years, I’ve collected much too many photos of barn details, which includes everything from latches on stall doors to drains in aisles. It’s only natural to collect the things you love, right? I often refer to my virtual stash of detail images when I’m designing a barn and hope they might serve as an inspiration to you as well. I will probably add to the collection (correction: I WILL add to the collection because I won’t be able to help myself) over time. What can I say, the details separate a fine barn from a fantastic barn. On that note, I hope you’ll forgive my lack of photography skill. Some of these images were taken during or just after the construction process by yours truly. That should serve to explain any and all photos with incomplete landscapes (aka piles of dirt) and unique angles (aka crooked) that are artistic-driven (aka fuzzy, out-of-focus) images.
By way of introduction to my collection, I think it seems fitting to begin this set barn detail images with the door. Every dutiful, the door is a part of every barn, everywhere. (At least I hope so.) You’ll see many images of my favorite, the Dutch door, which aids ventilation within the barn. There’s also human-only doors, main entrances, side doors, etcetera. Hopefully it’s not too much of a hodgepodge for you to enjoy.
Incidentally, I’ve asked one of the more tech savvy staff (basically anyone but me) to link these images on Pinterest; we’re attempting to hop on that fast-moving train because we architects sure appreciate a visual aid. If you’re a Pinner yourself, let me know so we can follow you there. Until then, happy collecting!
Dear disgruntled artists: the key to success isn’t kicking down the door; it’s building your own.
Designed in response to an adjacent new residence and in the style of existing barns on the private ranch, this eight-stall barn in Montana uses heavy timber framing and western cedar siding.
The program includes wash and grooming stalls, a lounge/office, large tack rooms, and a loft with a balcony that overlooks an outdoor arena. The barn’s deep overhangs create covered areas to wash and groom horses outdoors while a continuous translucent ridge skylight allows generous amounts of natural light within the barn.
Program 8-stall barn, outdoor arena, service building
As a kid in Tennessee, I grew up around horses, though I had no interest in properly riding them. That I left to my twin sister, who kept her Tennessee Walker named Dixie in a neighbor’s barn. For me, playing in the barn’s loft for days on end in the summer was much more appealing.
I left Tennessee for Clemson University (B.A. Architecture, 1969), where I developed an interest in designing buildings inspired by context, environment, and function: I became a student of the philosophy that “form follows function.” There was no doubt in my mind that I had left horses and the barn behind. After all, I never aspired to be an equestrian architect. I was a student of urban design. Ironically, over 25 years later, I earn a living designing equestrian facilities across the country. That is because a single interview changed my life.
Following graduate school (Washington University in St. Louis, M.A. in Urban Design, 1973), I relocated to Washington, D.C. in pursuit of its urban and robust economy as a place to possibly support a future architectural practice. My former colleague, Robbie Smith, and I began “moonlighting” on small side projects together and decided to create our own firm. As young architects, we’d happily take any project we could get our hands on. So, when Robbie received a phone call from a friend in the summer of 1983 about a fairly large potential horse project in Upperville, Virginia, we jumped. Forget that we had never designed a horse farm, or, for that matter, any other building of size of significance on our own. We had nothing to lose.
Preparation began for the big interview. We learned that the owner, Robert H. Smith (no relation to my partner, Robbie Smith), selected the renowned landscape architect Morgan Wheelock of Boston to plan the farm. Together, the owner and Wheelock sought an architect to design the farm structures to fit within the well-known Upperville and Middleburg, Virginia context.
Typically, during an interview you review your firm’s portfolio of completed projects with the potential client. This was not an option for Robbie and me — we’d have to approach this interview differently. Since Robbie was from Middleburg, he was familiar with the area’s building types. He spent a few days photographing various buildings in the area — forms, materials, and shapes — that represented Middleburg or Upperville in any way. Barns were certainly photographed, but we also considered residences, commercial structures, and other miscellaneous structures relevant. With plenty of images to inspire us, we selected a number of key examples. Many of these buildings were perhaps a hundred years old and probably weren’t designed by an architect. However, we felt they strongly represented the area. We took the photographs and projected the slides on the wall of our small office, traced over them, and transferred the images to illustration boards to serve as our “portfolio” presentation.
I’m not aware of what the other interviewing firms presented, but ours did not include a single building we designed or were designed by any architect, for that matter. Our presentation documented the context of the area in a series of hand-drawn sketches — but, at least, if the owner’s farm were to “fit” into the context, these were the shapes, forms, materials, and scale they should have.
We were hired immediately. Suddenly, we found ourselves with seven buildings to design with no staff in an unfurnished office space in a third-floor walkup in Georgetown — and we weren’t about to complain. We were embarking on a project that would change our lives.
Our client, Robert H. Smith, was a very successful developer in the Washington, D.C. area. While he had owned thoroughbred horses for several years, he stabled them at other farms or the track. Now he was ready to start a thoroughbred breeding operation, having acquired approximately 400 acres in Upperville, adjacent to the famous Rokeby Farm (owned by Paul Mellon) on one side and Route 50 on the other. Also included within the property were the grounds to the Upperville Horse Show, the oldest functioning horse show grounds in the United States.
Morgan Wheelock, the landscape architect, brought a background in designing horse farms to the project: with it, his theory that barn design, as well as the farm layout, should be driven by a paramount concern for the health and safety of the horse. The way the building is viewed and placed in the landscape, Wheelock believes, is as important as the design of the building itself. That’s because both the farm layout and the barn design impact the health and safety of the horse; concerns possibly even more apparent when operating a breeding facility for thoroughbreds.
Barns are often perceived as dark, dusty, and uninviting buildings. However, it’s also widely understood among equestrians that the best environment for a horse beyond the great outdoors is an environment that inspires just that. Wheelock bridged these inconsistencies with a design theory that focused on creating natural light and ventilation within the barn. It was a revelation. While the concepts Wheelock professed were simple, they worked — and beautifully — at our first barns at Heronwood Farm.
I’d like to pass along the following information from The American Horse Council for my Virginia, Maryland, and Washington, DC area readers.
The American Horse Council will be hosting a FREE Tax Seminar featuring Tad Davis on Thursday November 4, 2010 at 6 p.m. at the Tri-County Feeds in Marshall, VA. This is an open invitation, so feel free to share it with other members of the horse industry so they can learn how current federal tax laws affect them and their equine businesses. Please see the attached invitation for more details.
This invitation is also posted on the AHC website, so feel free to visit the Events Page on the AHC website for information. We are asking that anyone that plans to attend please RSVP so w e can have an estimate of how many people to expect. Please direct all RSVPs to Bridget Harrison at email@example.com or 202.296.4031.