Whether for a horse barn or riding arena, there are a lot of things to consider in the slope of the roof.
Curious about recommended roof pitches in a riding arena? Senior architects John Blackburn and Ian Kelly advise that “a 4:12 pitch is pretty much our recommended minimum on any horse structure. We prefer steeper roofs for a natural chimney effect. However, unless you live in a cold climate where there is a lot of snow, we wouldn’t advise going taller than 6:12.”
The numbers indicating a 4:12 roof pitch mean the roof rises 4 inches in height for every 12 inches, as measured horizontally from the edge of the roof to the centerline.
Okay, so for barns our rule of thumb is as steep as you can make it. The steeper roof allows the Bernoulli principle and chimney effect to work more efficiently and effectively. But there are other considerations in designing the slope of a barn or arena roof.
For arenas, steeper the roof = the taller the building. This impacts the look or mass of the arena on the property which can be negative. It can stick out like a sore thumb or look like an airplane hangar in your backyard.
Because we depend less on natural ventilation in indoor arenas than in barns, we can get away with lower slope roofs. However, we don’t recommend lower than 4:12 if at all possible. We realize some HOAs and neighborhoods have severe height restrictions and the wider the arena, the more difficult it is to comply without “flattening” the roof. At Winter Farm in Peoa, Utah, we designed a low roof to stay within an imposed limit. In some areas, arenas may be considered agricultural buildings and therefore exempt from height limits. But that rule isn’t consistent across state lines or jurisdictions. For example, in one jurisdiction we were permitted a covered arena as a “sun shelter” and avoided building height limitations entirely.
Because arena walls at the perimeter are usually 16’ tall (need head clearance for horse and rider on interior below the structural frame), when the roof is a low slope, the roof becomes less visible as you get closer to the building and the building can look like a huge box.
You can make a huge box look great but that may require a lot more money and you typically want the arena to be in the background. The barn and the farm are the main focus and not that big ugly box on your farm.
One way we reduce the impact of the arena size is by pushing it into grade where we can, using the land contours and landscaping where possible, and placing it behind the barn and other structures to reduce the scale of the building.
Probably the best average height for a barn is 6:12 to 7:12. The reason is it is more difficult for a roofer to walk on a steeper roof without some sort of support. Thus the installation time increases dramatically as will the cost if it is built with a steeper roof.
One of the down sides for low slope roofs in snow climates is snow loading. A steeper slope can be designed to shed snow pack better than a low slope but the downside for that is the avalanche effect. When it melts it can fall fast, be loud and block doorways… a subject for another blog post!
How can you can be proactive in the design of your farm and your barn to protect your horse from the threat of barn fires? What can you do to minimize the damage and loss of buildings and most importantly your horse and human life?
Prevent, Contain, Suppress
Prevention is your best protection and your first line of defense. There are any number of reasons why barn fires occur. Many are outside your control but there are steps you can take to prevent a fire from getting started. Never overlook important management practices – organize, clean and prepare.
1) Keep a clean barn/farm (dust, cobwebs, bird nests, debris).
2) Keep aisle ways clear.
3) Keep your barn neatly organized.
4) Develop a fire safety plan and practice it.
5) And, of course, NO SMOKING!
Site planning is a critical component of farm fire prevention.
We recommend a separation of buildings and hazardous functions/materials from the barn.
Generally, we use a rule of thumb of 30’ to 50’ and sometimes 100’ depending on the terrain, building codes and building materials used. Hay / bedding, equipment and other flammable materials should be stored separately from the barn and isolated if possible within masonry fire resistant structures.
Manure storage is a critical concern and can be a flammable substance if not stored properly. It should be isolated separately.
Egress from the barn for people and horses. In case of a barn fire, the barn should open into a contained area so horses can be let loose quickly yet contained. We recommend locating at least one good size paddock near the barn that can receive a number of horses at one time. If possible, provide perimeter fencing around your farm to contain horses that may get loose and out on a roadway. Consider access to the farm and buildings for the fire trucks (we recommend a 12’ to 14’ access road minimum) with adequate support and clearance for the trucks and other emergency vehicles. Provide adequate clearance under trees, power lines and over farm bridges. Make sure you have adequate turn-around space for the emergency vehicles.
A suitable water source is critical. Provide either an on-site storage ponds, water tanks (above or below ground) and your water supply. If it’s from a well or municipal source consider the GPM flow, water pressure. You may also want to have a generator on the farm that can serve pumps if the power service should fail. And remember, fighting a fire will produce a great deal of water and that will turn into mud. So consider surface drainage for added safety around the barn.
Building layout is critical for preventing barn fires. Blackburn always designs wide center aisles. Keep them free of clutter. A shed row provides a safer layout for escaping a burning barn but they are not suitable in all locations.
Design your barn with no dead end aisles. Provide at least two exits for people and horses. We recommend openings of 1½ to 2½ the width of your horse (from stall and barn).
Consider the swing of doors – the direction of swing as well as latches used. We recommend sliding doors in the main aisle and hinged doors from stall to turnout stalls connected to the barn. The pin latch is far safer than the typical throw bolt latch. The pen latch is simpler in design (fewer moving parts and no springs and much faster to release.
The designers at Blackburn Architects make disaster prevention a priority through careful site planning and building design following THREE BASIC DESIGN PRINCIPLES:
1. BUILDING SYSTEMS/MATERIALS/FINISHES
The building materials and finishes are as critical as the barn layout. You should check your local building codes. (A good reference is the NFPA 150, 2019 edition). Though barns in many jurisdictions may be considered agricultural structures and not required to comply to building codes, we recommend you consult the NFPA code and adhere to it where possible.
There are four types of framing materials used in construction of equestrian facilities: light wood, timber, steel, masonry.
Light wood is the most common and lowest cost, but has the lowest resistance to fire. Timber frame is much safer. It will stand longer without collapse than light wood frame. Steel frame is flame resistant and can provide excellent protection. However, it is commonly used with light wood framing and other flammable finish materials that reduce its effectiveness in preventing or protecting from fire.
Electrical systems must be dust proof, rodent proof. Protect all light fixtures with cage or shatterproof lens. Remove or repair any frayed or damaged wiring. Do not use residential extension cords and do not overload circuits. Do not use household box fans. Heating systems within the barn should be kept to a minimum. Remember the barn is for horses, not humans.
Do not use portable space heaters and in warm rooms provide for installation of permanent heating equipment.
Lightning protection is another area of concern. Lightning rods are relatively inexpensive and should be installed on all barns if not all farm structures. Provide proper grounding devices and protection for all electrical equipment. You can install a warning system or rely on your phone weather app to alert you when lightning is near.
The second design principal is containment or compartmentalization. Compartmentalization uses firewalls and fire separations to contain the spread of fire and smoke. Insist that your builder close up all openings around beams, ducts, etc. Also, close up or limit attic or horizontal spaces thru use of fire curtains within those areas.
Your barn should insure proper ventilation for the health of your horse but you should be able to limit ventilation where necessary. The standard ventilation guideline is 1 sf per 100 sf of floor area in barn area or 1 sf for every 30 to 50 sf floor area in hay/bedding area.
Another design consideration to consider is to break up barns into smaller structures. A 24- stall barn is most efficient for a horse operation, but if possible it’s better to create smaller barns or provide fire and smoke separations within the barn layout. This level of planning will provide a better level of protection thru isolation.
The third design principal is suppression / detection. Early warning devices can be very effective, but they can be difficult in barn environments due to the dust and moisture. Always provide fire extinguishers throughout the barn and make sure they are inspected annually, they are the right type (A, B or C and we recommend having all three).
We also recommend including three types of detector devices; smoke, heat and flame. Each may be appropriate depending on the barn environment. For example, smoke detectors can be set off by dust and moisture. In those areas, you may want to consider another type, such as the laser light beam. Blackburn has used laser light beams in select areas, but they need to include some sort of delay mechanism so birds and other elements that can break the beam do not trigger an alarm. Consult with a fire detector manufacturer for the proper type and installation.
A smoke detector is your best line of defense, but a fire sprinkler is the best method you can install in your barn to suppress a fire. They come as either a dry or wet pipe system. The dry system is most common in barns that are subject to freezing temperatures. A wet pipe system is usually a lower cost but has limited use in unheated barns in sub-freezing areas.
Something to consider in a barn that may have nice finishes that could be subject to damage if the sprinkler system were set off by accident is the pre-action system. The Pre-action system is one that employs an automatic warning system that activates before the sprinkler system activates to protect from accidental discharge and protects damage to interior finishes
Finally, we strongly recommend that you consult with your local fire department regarding your fire protection plan and get your design approved.
Fire protection in an equestrian facility is always a concern of the highest priority. Because we’re often asked, we thought we’d offer information here on the fire suppression details the Blackburn design team has included in some of our latest projects.
At a new barn under construction in Indiana, we’ve specified a Dry Pipe System by Fire Tech, LLC. http://www.firetechstl.com/systems-preaction.php. We could have specified a “preaction sprinkler system,” but chose the dry pipe system because of the dangers of freezing pipes in the cold weather climate of the Midwestern United States.
To quote Fire Tech’s description, “A Preaction Sprinkler System is a system which employs automatic and closed-type sprinkler heads connected to a piping system that contains air (either pressurized or non-pressurized), with a supplemental system of detection serving the same area as the sprinklers. The systems are typically used in applications where the accidental discharge of water would be catastrophic to the usage of occupancy.
“Preaction Sprinkler Systems are similar to Dry Pipe Systems in that the water is kept from entering the piping valve, in the case a preaction valve. This valve is held closed electrically, only being released by the activation of the detection system (heat or smoke detectors mainly) when an electrical signal is sent to the releasing solenoid valve. The water then fills the pipe, ready for the activation of the sprinkler heads. Preaction systems can be arranged to be activated by only one detection device type, or many.”
In Indiana, our architects specifically called for a dry pipe system because of the potential for freezing temperatures, but also in case “one of the children kicks a soccer ball and takes out a sprinkler head” (the client’s words). With a dry pipe system, the sprinklers won’t go off unless they also sense smoke or fire (depending on the detector type). A false alarm could flood and ruin the barn’s expensive finishes. And using recessed/concealed pop up heads is a good idea where you can.
Another critical reason Blackburn specified a dry pipe system is because of an issue with water demand; the Indiana farm doesn’t have sufficient well water on site to power the system. Because of this, our client connected to county water. Keep in mind that If you’re on a well, you’ll likely never have enough pressure to support a fire suppression system. The gallon per minute (gpm) for firefighting is higher than your average ground well can produce. This means you must store water on site in a tank or pond.
At Sheik Island, one of our projects in Florida, we stored water below ground. In California, at a private facility, we installed an above ground tank adequate to run the system as required by the local fire department. Additionally, we posted signage limiting the occupancy (should the owner decide to sponsor a large event in the arena). The clients obtain a special permit when larger events occur, and they hire the local fire department to have a truck on hand during the event.
At the Devine Ranch, in Aptos, California, and at the Moss residence, also in fire-prone California, we provided on-site storage tanks with backup generators to operate a pumping system.
Next up on the Blog: fire limiting design guidelines we build into our projects.
Quite a few years ago, I participated in a web chat (remember those?) with the folks at EquiSearch. During the chat, a few chatters presented me with questions about their barn projects, which ranged from “how to’s” regarding initial planning stages or “what now’s” after building the basic framework. For old time’s sake, I thought I might share the chat’s transcript. For the sake of those reading today, I’d like to encourage any and all of you to ask away with questions or to present design issues of your own.
gatsbysmom – How much roof overhang do you recommend for a barn in the South?
Blackburn – Gatsbysmom…roof overhangs are very helpful in the south for shading…if you have Dutch doors where horses can stick their heads out, it allows them to do it…make sure the roof is projected out far enough so runoff doesn’t drop on the horses’ heads…a good dimension is 3.5 feet.
Just the other day, I came across a great blog entry about Mail Pouch Tobacco barns in Pennsylvania. The blogger, Pamela Simmons, wondered what became of the old barns she so vividly remembered dotting the landscape along highways in Western Pennsylvania. Read her article for some background info and a few terrific photos. I’d relish the chance to restore a big old barn like one of these Pennsylvania beauties; unfortunately, they seem to be few and far between these days. Please share your own photos or memories of the types of barns you recall seeing on car trips as a child or young adult.