healthy horse barns

Email Subscription

04.24.18

Retrofitting an Existing Barn Roof with Skylights & Vents

Sagamore 5With careful attention to design details, it is possible to retrofit your barn to be healthier for your horses. One important renovation to existing built structures is the addition of skylights and ridge vents to increase light and air flow.

Only a fortunate few horse owners design and build a barn from the ground up. Most buy a property with an existing barn. As the photos illustrate, Blackburn Architects’ client Kevin Plank, the CEO of Under Armour®, bought historic Sagamore Farm in Maryland, and undertook a significant renovation to add light and ventilation to the interior of his historic main barn.

Significant expenditures are not necessary, however. In this discussion, I’m offering simple recommendations for achieving healthier living space for horses starting with an existing barn.

VENTING OPTIONS

For venting an existing barn roof, I suggest one of two options:
1) Add Dutch doors along the barn sides or
2) Add a vent along the bottom edge of the skylight (or ridge if that works best though I prefer the curb vent for better free air access).

Option 1: Add Dutch doors along the barn sides
This option provides good access for ventilation to each stall and a great method of controlling air flow. An owner has the option of leaving just the upper door open to reduce the flow or open both upper and lower doors to give maximum free area. (Of course, in order to open both doors for full access you’ll need to add an interior mesh panel to keep horse in the stall.) If Dutch doors aren’t possible or within the budget, then I recommend adding low wall vents to bring in air low to the floor (which is good for foals and to vent odors caused by ammonia gases near the floor). The vents should be dampered for air control and screened to keep rodents from getting into stalls.

Additionally, Dutch doors provide an abundance of natural light, which reduces the need for electric lighting in the barn and helps purify the stall flooring, reducing the creation of harmful ammonia gases.

Option 2: Add a vent along the bottom edge of the skylight (or ridge)
This option allows for vertical ventilation of the barn using the Bernoulli Principle and the chimney effect. Though the existing barn may not have the best angle for prevailing breezes or roof slope, it will help nevertheless. I also recommend vents at the top of the wall at the roof eave if they can be added. This permits year-round ventilation above the heads of the horses, but still ventilates the barn vertically using the techniques described above.

ADDING SKYLIGHTS

There are a variety of methods and materials that can be used to retrofit skylights into an existing roof. At Sagamore Farm, Blackburn Architects’ design replaced the existing shingles with a new metal roof (not necessary; Sagamore’s roof shingles were worn out and metal was chosen as a better long term material). In more typical circumstances where the existing shingles are salvageable, simply remove the shingles along the ridge and cut out the sheathing or sub roofing material, leaving only the roof rafters.

Continuous curbs should be built along the edge of the opening. Although a continuous skylight or curb is not necessary, I find it aesthetically and functionally preferable. A skylight can then be placed on top of the curbs spanning from one side of the aisle to the other. The curb can and should be vented. The size and amount of free area depends on the barn design, size and location. The skylight width does not have to span the full width of the aisle but somewhere between 8 to 12 feet should be adequate.

The skylight can be either glass (costly and should be safety glass) or some form of polycarbonate. Check your local building codes for requirements. I do not recommend clear glazing. Translucent glazing reduces the visibility of dirt and filters light, which better serves the barn interior. It’s best not to let a strong band of sunlight hit a stalled horse for a long period of time. I also recommend painting the interior of the roof and framing members a light color to improve reflectance.

If a continuous skylight is not possible, then individual roof skylights can be installed over the center aisle. However, if the skylights are not high on the roof and are not vented, they may not do much to increase the barn’s vertical ventilation.

If the barn has a loft it may be possible to remove it, leaving specific structural members spanning across the barn to hold the building together and to provide wind shear strength to the barn. If the loft is used for hay storage (which I don’t recommended for health and safety reasons), then it may be possible to remove a portion of the loft over the aisle leaving the loft in place over the stall for storage or the reverse of that (remove the loft over the stall but leave it in place over the aisle).

While these approaches to increasing light and ventilation in existing structures can work wonders, you should always contact a structural engineer before installation of skylights to determine if the barn can take the modifications needed of if some additional structural work needs to be done.

Posted in Equestrian News, News and Press | | Leave a comment >
11.21.16

Dear John: Polycarbonate Panels

John Blackburn answers your questions about barn design.

polycarbonate-panels

Q: Dear John,
Long ago you were kind enough to give me a bit of advice about planning a barn.  We got started last spring, but were waylaid by an evil contractor who put the barn in the setback, with poles only 18″ in the ground, and a drainage system two feet too high to catch any water.  On top of that, he dumped 130 truckloads of bad, unnecessary fill, and built a retention pond that is 36% too small – UGH! Luckily it was all easily documented by the project’s engineer so we are able to recoup a little of the money laid out.  

So:  moving along, we deconstructed the barn, redid all the drainage, and turned to a pre-fab barn.

The new building is a 60×120 raised center aisle structure.  I requested open sidelights and a ridge vent to help keep airflow going in the soggy, humid climate in the northwestern US.  The stalls almost always will be open to an 8ft shed eave and attached paddock.  Their fronts are composed of lots of steel mesh — so lots of air.

I’m NOW STUCK. I feel quite stuck because no one around here understands your way of doing things. I’m trying to incorporate what I learned over the years from your publications.

Please help with my roofing situation:

The roofing is 26g boxed rib metal panels.  I requested polycarbonate panels be incorporated for natural light.  The question is whether it’s unwise to let the whole raised center be polycarbonate, or go with only one light panel per 12ft section–and whether it’s crazy to use clear vs opaque white panels.  (Most weeks out of the year it is damp and grey and cold here.)  The barn company is in hot California so they think the whole idea is nuts.  

If moved to offer an opinion, please know I’m already grateful.
Thank you,
Northwest Endurance Rider

A: Dear Northwest Endurance Rider,

I understand why you resorted to prefab because you’ve been thru a nightmare. However, prefab barns can be hot boxes in the summer, and don’t always provide adequate controls for natural light and ventilation. Pre-designed, pre-engineered buildings are typically designed the same for all areas of the country and no two areas of the country are alike nor are the sites. Environmental and weather conditions can differ dramatically so a prefab building designed to fit all sites just does not work best for the health and safety of stabling for horses.  But I understand.  You’ve selected the barn you want, now my advice is you should provide for as many options as you can for control of natural light and ventilation.

You mentioned a 60 ft x 120 ft raised center aisle structure.  How many rows of stalls are there in the barn?  The best arrangement is to have one center aisle and a row of stalls along each side of the barn.  The 60 ft width sounds like there are two main aisles with rows of stalls on both sides of each aisle.  That would mean two of the rows of stalls are back to back and not on the exterior where they get adequate ventilation and natural lighting.

The 8 ft shed eave is too low in my opinion.  I use 12 ft as a minimum though 10 ft may work for smaller horses and if there are no obstructions below the roof.  However, there are usually lights, fans, beams, etc. that drop down and they can be a danger to horses.

I like the use of translucent polycarbonate panels.  Translucent, not clear, as it breaks up the light and hides the dirt that accumulates on the skylight over time.  Providing polycarbonate across the center aisle sounds nice, but I’m unsure how it will look on the barn design you selected.  If you’re putting a skylight over the raised center aisle roof, what is on the face of the raised center portion?  There is usually some sort of glazing or louver for venting.  It will be important that these elements complement one another. Thanks for the question and I hope this is helpful.  
Good luck!
John

Posted in Equestrian News | | Leave a comment >