Birds Mouth Post 100 x 100mm x 1.0m

100 × 100 mm × 10 m Birdsmouth Post

A long‑length post engineered for birdsmouth joining – specifically designed for knee‑rail or birdsmouth fencing applications, but with the extended 10 m length suited for large boundary or estate installations. This post gives you the flexibility and strength to span large areas while utilising the birdsmouth notch to securely seat horizontal rails.

Popular rail sizes include: 75mm x 75mm & 100 x 100mm (sold as Square Timber Posts). Rails are fixed in place with metal knee Rail Straps, find them in the metal fencing brackets section.

Key Features:

- Cross‑section: 100 mm × 100 mm – square section for consistent strength and traditional compatibility
- Long length: 10 m – suited for large projects and longer spans
- Birdsmouth profile/notched design – enables secure seating of horizontal rails for knee‑rail or low demarcation fencing.
- Pressure‑treated timber – suitable for outdoor and ground‑contact applications
- Ideal for pathway borders, parkland fencing, estate boundaries, or demarcation where full enclosure isn’t required

Explore our full Posts & Postmix range.

Need help? Check out our beginner’s guide on how to install a fence post.