Feedlot Roof Design

The roof is one of the most important components of a covered feedlot. While its primary role is to provide protection from the elements, roof design also influences natural ventilation, livestock comfort, structural performance and the overall efficiency of the facility.

A well-designed roof works as part of an integrated system alongside building orientation, ventilation and structural engineering. Factors such as roof pitch, building span, ridge design and overhangs all contribute to how the feedlot performs throughout the year.

Considering these elements during the planning stage helps create a facility that’s designed for both current operations and long-term performance.

Why Roof Design Matters

Roof design affects far more than weather protection.

The shape and configuration of the roof influence how air moves through the building, how effectively heat escapes and how the structure responds to environmental conditions.

A well-planned roof can help:

  • Support natural ventilation.
  • Improve livestock comfort.
  • Protect feeding and operational areas from weather.
  • Improve structural performance.
  • Reduce long-term maintenance requirements.
  • Support future operational flexibility.

Rather than being viewed as an isolated structural element, the roof should be designed as part of the overall feedlot system.

Choosing the Right Roof Pitch

Roof pitch influences both structural performance and natural airflow.

The appropriate pitch depends on factors such as building width, local climate, rainfall, ventilation objectives and structural design requirements.

Selecting an appropriate roof pitch helps:

  • Encourage effective water runoff.
  • Support natural air movement.
  • Improve ridge ventilation performance.
  • Contribute to long-term structural durability.

The roof pitch should always be determined as part of the complete building design rather than considered independently.

What Roof Pitch Should a Covered Feedlot Use?

The MLA Feedlot Covered Housing Systems: Best Practice Design and Management Manual provides useful starting points for naturally ventilated covered housing.

For monoslope roofs, MLA recommends a slope of at least 7° (approximately 1 vertical to 8 horizontal) when used with suitable sidewall openings.

For wider gable-roof buildings, MLA recommends a roof pitch of at least 15° (approximately 1 vertical to 3.7 horizontal), with pitches of around 22° providing improved airflow patterns and ventilation.

A steeper pitch increases the volume of air within the building and helps warm air move towards the high point of the roof. However, pitch also affects overall building height, structural design, roof overhangs and cost, so it should be considered alongside the complete building geometry rather than selected independently.

How Roof Pitch, Eave Height and Ventilation Work Together

Roof pitch is only one part of the ventilation system. Building width, eave height, overall roof height and ridge design all influence how effectively air moves through a covered feedlot.

MLA notes that wider buildings are generally more difficult to ventilate naturally than narrower structures. As building width increases, maintaining the same roof pitch also increases ridge height and the volume of air within the building.

Eave height is also important because the sides of the structure provide the main pathway for fresh air to enter. MLA recommends a minimum eave height of around 5 metres for a 30-metre-wide covered housing building, both to support ventilation under most climatic conditions and to provide clearance for typical feedlot machinery.

This is why increasing the width of a proposed building may require changes to more than the structural span. The roof pitch, eave height, ridge height and ventilation openings may all need to be reviewed together.

Understanding Building Spans

Building span plays a significant role in the overall performance of a covered feedlot.

Wider spans provide greater flexibility within the feedlot by reducing internal columns and creating larger uninterrupted operating areas. At the same time, increasing span widths requires careful structural engineering to ensure the building continues to perform safely and efficiently.

Building span also influences:

  • Ventilation performance.
  • Structural design.
  • Roof configuration.
  • Machinery access.
  • Future operational flexibility.

Finding the right balance between operational requirements and structural efficiency is an important part of the planning process.

MLA’s covered housing guidance generally recommends building widths of around 30 metres or less for naturally ventilated gable-roof structures in most locations, while single monoslope spans are generally around 10 metres. Wider structures may be possible where climate and natural breezes are favourable, but ventilation should be assessed carefully as the building width increases.

The Role of Ridge Vent

Ridge vents play an important role in supporting natural ventilation.

As warm air rises within the building, ridge openings allow it to escape while encouraging fresh air to enter through lower openings. This continuous exchange of air helps create more consistent environmental conditions throughout the feedlot.

The effectiveness of ridge ventilation depends on several factors working together, including:

  • Roof pitch.
  • Building width.
  • Prevailing wind conditions.
  • Overall building orientation.
  • Structural design.

Considering ridge design early helps ensure it integrates effectively with the rest of the building.

  • Machinery access.
  • Future operational flexibility.

Finding the right balance between operational requirements and structural efficiency is an important part of the planning process.

MLA’s covered housing guidance generally recommends building widths of around 30 metres or less for naturally ventilated gable-roof structures in most locations, while single monoslope spans are generally around 10 metres. Wider structures may be possible where climate and natural breezes are favourable, but ventilation should be assessed carefully as the building width increases.

The Role of Ridge Vent

Ridge vents play an important role in supporting natural ventilation.

As warm air rises within the building, ridge openings allow it to escape while encouraging fresh air to enter through lower openings. This continuous exchange of air helps create more consistent environmental conditions throughout the feedlot.

The effectiveness of ridge ventilation depends on several factors working together, including:

  • Roof pitch.
  • Building width.
  • Prevailing wind conditions.
  • Overall building orientation.
  • Structural design.

Considering ridge design early helps ensure it integrates effectively with the rest of the building.

How Large Should a Ridge Vent Be?

MLA provides a general design principle of an unimpeded ridge vent opening equal to approximately 5% of the building width.

For example, a 20-metre-wide gable-roof building would indicate an opening of approximately 1 metre. Where a ridge cap is used, MLA also suggests approximately half that distance between the cap and the roof to avoid unnecessarily restricting airflow.

An open ridge can provide better air movement because there is less obstruction to escaping air, but it can also allow rainfall into the building. Where rain could enter bedding areas, a ridge cap may be required. The cap then needs to be designed carefully so weather protection does not significantly reduce ventilation performance.

The optimum ridge opening still depends on factors including cattle numbers, stocking density, building width, eave height, roof height, pitch and local climate, so the 5% figure should be treated as a useful starting point rather than a universal specification.

Why Roof Overhangs Matter

Roof overhangs provide additional protection beyond the main structure.

Appropriately designed overhangs can help reduce weather exposure around the edges of the building while improving protection for feed bunks, livestock and operational areas.

Potential benefits include:

  • Improved weather protection.
  • Reduced rain ingress.
  • Greater shade around external areas.
  • Protection for feed delivery zones.
  • Improved longevity of surrounding infrastructure.

The size and design of overhangs should be determined alongside the overall building layout and operational requirements.

Roof pitch also affects overhang requirements. MLA notes that as the pitch of a monoslope roof increases, the overhang on the high side generally also needs to increase to help prevent rain entering the building.

Shade Structure or Fully Covered Housing?

Providing shade and creating a fully covered feedlot are not the same design problem.

A shade structure is primarily intended to reduce cattle exposure to direct solar radiation while leaving much of the pen open to rainfall and natural conditions. MLA’s Feedlot Design Manual notes that commercial feedlots commonly provide approximately 3–3.75 m² of shade per head, although the amount and configuration vary between operations.

A fully covered housing system, by comparison, places the whole pen under a waterproof roof, often including the feed bunk. MLA notes that this changes a much wider set of design considerations, including ventilation, bedding and manure management, stocking density, drainage, machinery access and the separation of clean roof runoff from contaminated water.

The decision between shade, partial coverage and full coverage should therefore be based on what the project needs to achieve. If the objective is primarily relief from solar heat, shade may be appropriate. Where the objective also includes excluding rainfall, managing pen conditions, increasing operational control or changing stocking arrangements, a fully covered system requires a more integrated building design.

Structural Design Considerations

Every roof system must work together with the building’s structural design.

Factors such as wind loads, regional climate, roof geometry, building dimensions and future expansion all influence the engineering requirements of the structure.

Rather than selecting roof features individually, the structural design should bring together:

  • Roof pitch.
  • Building spans.
  • Ridge ventilation.
  • Overhangs.
  • Wind and environmental loads.
  • Future operational requirements.

An integrated structural approach helps create buildings that perform reliably over the long term.

Planning a covered feedlot? Talk to TechSpan early in the process. We can help test roof pitch, spans, eave heights, ridge design and operational clearances against the proposed building footprint before the structural design is finalised.

Bringing Roof Design Together

Effective roof design is about far more than covering the feedlot.

Roof pitch, span, ridge ventilation, overhangs and structural engineering all influence how the building performs throughout its life. When these elements are considered together during the planning stage, they create a covered feedlot that supports natural ventilation, livestock welfare and efficient day-to-day operations while providing the flexibility to adapt as your business grows.

The important point is that these dimensions work together. Changing the span can change the required building height and ridge opening. Changing the roof pitch can influence airflow, overall height and overhang design. For this reason, the roof should be developed alongside ventilation, orientation and feedlot layout, rather than as a separate structural decision.

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