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Bird block (aka frieze board)

In the construction industry, a bird block, also known as a frieze board, refers to a horizontal framing member installed between the rafters or trusses at the top of an exterior wall. It serves to prevent birds and small animals from entering the attic space while still allowing for adequate ventilation.

Bird blocks are typically made of wood and are installed in a continuous row along the top edge of the exterior wall, directly beneath the eaves or overhangs of the roof. They are positioned between the vertical studs or other framing members and are spaced at regular intervals to cover the entire length of the wall.

The primary function of bird blocks is to close off the open spaces between the rafters or trusses, which would otherwise provide entry points for birds, rodents, insects, and other pests. By filling these gaps, bird blocks help to protect the attic space from unwanted intruders and potential damage caused by nesting or infestation.

In addition to pest prevention, bird blocks also play a role in attic ventilation. They are designed with small openings or gaps that allow air to flow freely between the exterior and interior of the attic. This airflow helps to regulate temperature and humidity levels within the attic space, reducing the risk of moisture buildup, condensation, and mold growth.

While bird blocks are primarily functional in nature, they can also contribute to the overall aesthetic appeal of a building. When properly installed and painted to match the surrounding trim or siding, bird blocks blend seamlessly into the exterior facade, providing a finished look to the eaves and roofline.

Overall, bird blocks are essential components of residential and commercial construction, offering both practical benefits in pest control and ventilation, as well as contributing to the architectural integrity of the structure.

During the construction of the new house, the carpenters installed bird blocks along the eaves to prevent birds and pests from accessing the attic space.

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