Concrete Requirements for 10 Fence Posts
Whether you're building a side boundary fence or replacing a section of damaged fencing, setting 10 posts is a manageable weekend project. Understanding the total concrete requirements helps you purchase efficiently and plan your work schedule.
Total Material Calculation
At approximately 2-3 bags per post, 10 fence posts require 20-30 bags of post mix concrete. This variance accounts for different hole sizes and depths. For standard 1.8-metre fencing with 90x90mm posts in 250mm x 600mm holes, 25 bags provides adequate coverage with a small margin for irregularities.
Purchasing Strategy
Post mix is typically sold in 20kg bags at hardware stores. Buying in bulk quantities often attracts discounts; enquire about pallet pricing if your project scope warrants it. Consider delivery options, as 25 bags weighs 500kg and may exceed your vehicle's capacity or your back's tolerance.
Workflow Optimisation
Dig all holes first, then set posts systematically. This approach lets you verify alignment before any concrete is placed and allows efficient batch mixing. Mark hole positions carefully using string lines stretched between end points to ensure straight fence lines.
Setting Sequence
Set end posts and corner posts first, checking they're perfectly plumb. These reference posts establish your fence line. String lines between end posts then guide intermediate post positioning, ensuring consistently straight results even over uneven terrain.
Timing Considerations
With quick-set concrete, expect to spend 5-10 minutes per post on the setting process. Allow for hole preparation, mixing, setting, and alignment checking. Ten posts realistically takes 3-4 hours once holes are dug, assuming you're working steadily with brief rests between sets.
Material Staging
Stage concrete bags along the fence line before starting, placing them near their respective holes. Also position water containers at intervals, as you'll need clean water for mixing at each post location. This preparation eliminates delays once you begin the time-sensitive setting process.
Need Different Specifications?
Use our post hole calculator to enter your exact hole dimensions and post size. You can also explore our slab calculator or footing calculator for other concrete projects.