Fence Post Concrete — Rapid-Setting Post Mix for Secure, Straight Posts

Get your posts in the ground fast with our fence post concrete — a pre-mixed, rapid-setting post mix designed specifically for securing fence posts, gate posts, signposts and similar vertical installations. Supplied in convenient 20 kg bags, this ready-to-use dry mix needs no wheelbarrow or mixer: simply pour into the hole, add clean water as directed on the bag, and tamp lightly. The rapid-set formulation achieves an initial set in around 5–10 minutes, giving you early support so you can plumb, brace and move on quickly — ideal for both DIY users and professional contractors.

Each 20 kg bag of fence post concrete provides a dependable fill for one standard post hole of roughly Ø100 mm x 600 mm depth (typical for a 1.8 m fence post). For larger holes, heavy gates, corner/end strainers, or poor ground, plan on two or more bags per post. The blend of graded aggregates and quality cement delivers durable, long-lasting results across a wide range of UK soil types, while the moisture-resistant packaging allows outdoor storage without the mix taking on water.

Why choose Hanson Fence Post Mix?

• Rapid setting: Early grab in 5–10 minutes helps posts stay true and reduces waiting time between bays.
• No-mix convenience: Pour the dry mix, then add water — clean, simple, and consistent.
• Reliable yield: A single 20 kg bag suits a 100 x 600 mm hole; scale up for wider/deeper holes or high-load posts.
• Versatile: Suitable for timber, steel or concrete posts, bollards, mailboxes and garden structures.

How to use (quick guide)

1. Dig a neat, bell-shaped hole to the recommended depth for your post height and load.
2. Position the post on a compacted gravel pad (for drainage).
3. Add water to the hole following the guidance on the bag.
4. Pour fence post concrete evenly around the post until no standing water remains; lightly tamp to eliminate voids.
5. Plumb and brace the post. Initial set occurs in minutes; avoid loading until the mix has stiffened.
6. Cure: Allow adequate curing time (typically several hours for light handling; longer before full loading). Protect from frost, heavy rain and extremes of temperature during the first 24 hours.

Concrete Mix Coverage & tips

• Standard panels with intermediate posts generally use 1 bag per post; corner, end or gate posts often require 2+ bags.
• In weak or water-logged ground, widen the hole or increase the quantity for stability.
• Always follow on-bag water dosage for best strength and finish.
• For wider/deeper holes, poor soils, or higher loads (gates, corners), increase hole diameter and use additional bags of fence post concrete.
• Shape holes wider at the bottom (“bell” profile) for uplift resistance, and always use clean water to the on-bag dosage.
• Protect fresh rapid-setting post mix from heavy rain, frost, or high heat during early cure.

If you’re looking for a fast, tidy and reliable way to set posts, this rapid-setting fence post concrete (also known as post mix or fast-set post concrete) keeps projects moving and posts rock-solid — no mess, no mixers, just consistent results.

Additional Uses for Fence Post Concrete (Rapid-Set Post Mix)

Beyond standard fence posts, fence post concrete (rapid-setting post mix) is handy for a wide range of light-to-medium duty anchoring and small footings around the garden and site. Typical applications include:

• Gate posts & repair spurs: Set or re-set leaning or damaged posts without mixing gear. For end/corner/gate posts, plan on 2+ bags per hole for extra stability.
• Pergolas, arbours & trellis uprights: Create neat, discrete footings that grab quickly so you can plumb and brace timber frames the same day.
• Decking support posts (spot footings): Use for isolated deck posts on stable ground; bell-shape the hole and add a compacted gravel pad for drainage.
• Rotary washing lines & parasol sleeves: Backfill sleeves or sockets to keep vertical items true and wobble-free.
• Bollards & driveway chain posts: Anchor timber or steel bollards to deter vehicles or define boundaries.
• Garden screens & privacy panels: Secure slimmer posts for slatted screens and decorative panels where a fast set reduces bracing time.
• Mailbox posts & signposts: Perfect for residential signage, house numbers, way-finding posts and small notice boards.
• Play equipment anchors: Fix posts for swing frames, balance beams or goal posts (follow the manufacturer’s foundation guidance).
• Greenhouse, shed & kennel point supports: Form small point pads for lightweight outbuildings that use post-and-beam bases.
• Bird tables & feeder poles: Quick, tidy anchoring for wildlife features that need to stand plumb.
• Clothesline posts & antenna masts: Keep tall, slender items upright with a rapid-set surround.
• Edging stakes & small landscaping fixtures: Secure timber edging pegs, tree supports, boundary markers and temporary site fixtures.
• Haunching minor features: Spot repairs and small haunches for edging stones, steps or thresholds where a rapid grab is useful (non-structural).

Limitations: This quick-setting post mix concrete is intended for anchoring posts and small footings. It’s not a replacement for engineered slabs, deep foundations, or structural concrete designed to BS EN 206/BS 8500. For structural work, consult a professional and follow building-regulation requirements.