Constructing Pole Barns: Chicken House Trusses

Building a pole barn with chicken house trusses is a cost-effective way to gain extra headroom. However, it is important to consider the potential drawbacks of this method, such as the risk of collapse due to heavy snow or ice loads, as well as the possibility of virus contamination from the used chicken trusses. To mitigate these risks, one should consider having the trusses cleaned and inspected, or building with a wider span between trusses to reduce the risk of collapse. Building a pole barn with chicken house trusses requires careful planning and consideration of local conditions, such as snow load and wind forces, to ensure the structure is safe and stable.

Truss design and spacing

When designing the trusses, it is important to consider the span and spacing. The span refers to the distance between the outer sides of the top sills, which will determine the length of the long boards for each truss. For example, one builder shared that their truss span was 11 feet 2 inches, requiring two 8-foot-long boards for each truss.

The spacing of trusses will depend on the desired width of your pole barn. In one example, a builder constructing a 50-foot-wide pole barn opted for 8-foot truss spacing, allowing for ample room for insulation. Another builder with a 30-foot-long structure chose to space their trusses 10 feet apart, requiring only four trusses.

It is important to consult with a structural engineer or a truss designer to ensure that your truss design and spacing can safely withstand local wind and snow loads. For instance, additional lateral bracing may be required to prevent compression members from buckling under wind forces.

When building with chicken house trusses, it is essential to consider the height of the structure. Chicken house trusses typically provide a higher ceiling height, which can be advantageous for certain applications. However, it is important to ensure that the trusses are properly cleaned and disinfected to address any potential health risks associated with previous use in chicken houses.

Truss cleaning and safety

The cleaning process for trusses involves several steps. Firstly, an inspection is carried out to identify areas with significant grease buildup and to check for any accumulation of dirt, dust, or debris. This is followed by a pre-cleaning stage, where loose dirt or debris is removed using brushes, vacuum systems, or compressed air. Specialized degreasing agents or solvents are then applied to the greasy areas to break down and dissolve the grease. A technician may use brushes or scrubbing equipment to agitate the solution and dislodge the grease from the truss surfaces. Once the grease is loosened, it is wiped away with clean cloths or sponges, and a rinsing step with water may be necessary to ensure that all residues of the degreasing agent are removed. The components are then allowed to air dry thoroughly before being put back into service.

In the case of chicken house trusses, additional cleaning measures may be required to disinfect the wood and prevent bird-borne viruses. One suggestion is to sandblast the trusses and paint them, while another recommendation is to spray them with diluted bleach. These steps can help ensure that the trusses are safe to use and reduce potential health risks.

It is also important to consider the structural safety of the pole barn with chicken house trusses. One concern raised by a user on Garage Journal is the potential for collapse due to heavy snow and/or ice loads. To mitigate this risk, an engineer could specify closer spacing between the trusses. Regular inspections and maintenance of the structure can also help ensure its safety and longevity.

Cost of materials

The cost of materials for building a pole barn with chicken house trusses can vary depending on several factors. Firstly, the size of the barn is a significant factor affecting the cost. Larger pole barns require more materials, labour, and time, resulting in higher costs. Common sizes include 30'x40', 40'x60', and 40'x80', with prices increasing as dimensions grow. For example, a 30'x40' pole barn typically costs between $8,000 and $15,000, while a larger 40'x60' barn can range from $20,000 to $30,000 or more with additional features.

The type of materials used also directly impacts the overall cost. Steel siding and roofing are generally more expensive than wood but offer durability and fewer repair costs over time. Metal roofing, in particular, can contribute to higher upfront costs but may be a worthwhile investment due to its longevity. Additionally, insulation is another variable that affects the bottom line, as it is essential for energy efficiency and comfort.

The cost of materials can also depend on the level of customization desired. A smaller, basic barn typically costs between $10,000 and $15,000, while a larger, more customized structure can exceed $30,000 to $50,000 or even $100,000 for residential pole barns with high-end finishes.

Site preparation costs should also be considered, as they can vary depending on factors such as the type of pad (stone, dirt, or sand) and the need for additional work like levelling the pad or creating a driveway. Proper site preparation is crucial to reducing construction costs and extending the building's lifetime.

Furthermore, the location of the build can influence material prices and labour rates. For example, building in an area with high snow loads may require stronger trusses, resulting in larger chord sizes, more diagonal webs, and increased steel plate sizes, all of which add to the material costs.

It is worth mentioning that DIY pole barn kits can offer cost savings by reducing labour expenses. These kits provide pre-measured and pre-cut materials, simplifying the assembly process. However, additional costs may arise for tools, permits, and specialised labour for plumbing or electrical installations.

Overall, the cost of materials for a pole barn with chicken house trusses can vary widely depending on the specific circumstances and choices made during the planning and construction process.

Building the trusses

First, it is essential to determine the desired dimensions of your pole barn and the number of trusses needed. The spacing between trusses is crucial, as it impacts the stability and structural integrity of the building. The standard spacing is around 10 feet between each truss, but this may vary depending on specific requirements and local regulations.

Next, you need to source the chicken house trusses. These can sometimes be sourced from local commercial chicken farms or scrap yards, but ensure they are in good condition and free from any bird viruses or contaminants. Clean and disinfect the trusses if necessary; sandblasting, painting, and spraying with diluted bleach are recommended methods.

Now, you can begin constructing the trusses. Build a master truss first, ensuring it fits your specific dimensions. Create a temporary floor and use scrap wood to form a jig to hold the truss in place. Precut boards to match the master truss and place them in the jig. This ensures consistent sizing and makes it easier to assemble the trusses.

After the trusses are assembled, brace each one up high and cut them to sit flush on the top sills. Mark the spacing for each truss on the top sills, and pre-drill pilot holes in the ends, which will make it easier to nail them in place. Install the trusses one by one, ensuring they are secure and properly aligned. The first and last trusses should have their braces facing inward to prevent obstruction when nailing the outer wallboards.

Finally, consider adding lateral bracing to reinforce the structure. Wind forces can be an issue, so consult with an engineer or a truss designer to determine the required bracing. Diagonal bracing, such as 2x6s running diagonally on the bottom of the perlins, can enhance the stability of the building.

Building trusses for a pole barn is a challenging task that requires careful planning and execution. While it can be a cost-effective solution, it is important to prioritize safety and structural integrity.

Installing the trusses

Building a pole barn with chicken house trusses can be a challenging but rewarding task. Here is a step-by-step guide to installing the trusses for your pole barn:

Planning and Preparation:

Before beginning construction, it is important to have a clear plan and all the necessary materials. Consult with a truss designer or engineer to determine the appropriate truss design, spacing, and bracing required for your structure. Consider wind forces and snow loads, as well as local building codes and standards, to ensure your pole barn is safe and compliant.

Constructing the Master Truss:

Start by building a master truss according to your specific dimensions. Ensure that the width from sill to sill is consistent and matches the length between the two outer sides of the top sills. Brace the master truss up high and cut it to sit flush on the top sills. Once you are satisfied with the fit, use it as a template to create additional trusses.

Creating Additional Trusses:

Lay the master truss on a sturdy, temporary floor and secure scrap wood around it to create a jig. Place precut boards that match the master truss into the jig to ensure accurate positioning. Mark the spacing for each inner truss on the top sills with a pencil to guide your installation. Create as many trusses as needed, following your marked spacing and dimensions.

With your trusses ready, it's time to install them one by one. If possible, build each truss in the loft area to save the effort of hoisting them up. Secure the first and last trusses on both ends with the braces facing inward to prevent obstruction when nailing the outer wallboards. Predrill pilot holes in the ends of the trusses to make the installation process easier, especially if you're working alone. Maneuver each truss into place and nail them securely, ensuring they are flush with the top sills.

Finalizing the Structure:

Once all the trusses are installed, add lathing to the rafters, similar to the process used for the trusses. This will provide a solid framework for your roof. Finish by installing your chosen roofing material, such as a tin roof, to complete the exterior of your pole barn with chicken house trusses.

Remember to take appropriate safety measures during construction and ensure your structure complies with local regulations.

Frequently asked questions