Tierline Retaining Walls Core-Filled Besser Block Walls
Core-filled besser is the engineered premium: reinforced masonry on a designed, reinforced footing, the choice for a tall wall, a wall under a surcharge like a driveway or a building, or any wall that has to be certified. The footing is sized by the engineer to the wall and the soil, steel starter bars tie it to the core-filled cells, and the drainage is built in. It is the wall you choose when the height and the load mean a sleeper wall should not carry it.
What this job includes.
- ✓Core-filled, steel-reinforced besser block retaining walls
- ✓Engineer-designed reinforced concrete footings, sized to the soil
- ✓Steel starter bars tying the footing to the core-filled cells
- ✓Weep holes, ag-pipe, aggregate and geofabric drained behind
- ✓Structural design and certification on every wall over a metre
A besser wall is reinforced masonry on an engineered footing
Core-filled besser is the wall you choose when the height climbs past what posts and sleepers should hold, when a driveway or a building sits above it, or when the council needs the wall certified. It is reinforced masonry on a designed, reinforced footing: an engineer-sized footing in the ground, steel starter bars tying the footing to the cells in the blocks, every cell core-filled with concrete and reinforced through the height. The footing is the part that stops the wall tipping, and a besser wall on a shallow pad is a failure waiting to happen, no matter how cleanly the blocks are laid.
What changes when the wall carries a surcharge
A besser wall holding a level garden behind it and a besser wall with a driveway, a turning bay or a building above it are not the same wall, even at the same height. A surcharge adds load that pushes the top of the wall out, so the footing widens, the steel bars get heavier and closer, and the core-fill spec steps up. Our structural engineer designs the footing and the reinforcement to the wall, the soil and the surcharge, and the design package goes with the council development application before we dig. The engineering fee and the council fee are both itemised on the quote, with a realistic approval timeline.
What an itemised besser block quote includes
- The wall measured by face-metre (length by height) and priced with the block type and the core-fill spec named on the page
- The engineer-designed reinforced concrete footing dimensions, depth and reinforcement steel
- The steel starter bars tying the footing to the core-filled cells, and the vertical reinforcement through the wall
- The core-fill mix and the cells filled (every cell, or to the engineer’s pattern), named on the quote
- The weep holes through the base course, the ag-pipe and the free-draining aggregate behind the wall, and the geofabric layer
- The structural engineer design fee and the council development approval fee, each its own line
- The excavation, the spoil cartage, the access on a steep block, and the tip fees, each itemised
- The 10-year structural and drainage warranty, plus the engineer certification handed over with the council consent paperwork
A besser wall costs more per face-metre than a concrete sleeper wall, and the gap is mostly the footing, the engineering and the council line. We break it out so the gap is a number you can see, not a round figure with no explanation.
Priced by the face-metre, itemised line by line.
The face-metres and height, the material and the footing named, the drainage as its own line, the engineering and council line if it is over a metre, excavation and access, and the boundary note if the wall holds up a neighbour. Not one round number for a wall.
- 1 Face-metres, height and material. The price broken down by face-metres and the wall height, with the material named: concrete sleeper, core-filled besser, timber, link-block or stone. Not one round number for "a retaining wall".
- 2 The footing and reinforcement. The footing sized to the wall and the soil: a reinforced concrete footing for besser, concrete-set posts dug to depth for sleeper walls, with the reinforcement named. This is the line cowboys skip.
- 3 The drainage, as its own line. The ag-pipe (subsoil drain) along the base, the free-draining aggregate backfill, the weep holes and the geofabric. Trapped water is the number one reason walls fail, so the drainage is on the quote, not left off.
- 4 The engineering and council line. If the wall retains over a metre, the structural engineer design and certification and the council development approval, itemised, with a realistic approval timeline, not folded into a round number.
- 5 Excavation and access. The cut, the machine access on a steep or tight block, the spoil carted away and the tip fees, each a line, never sprung on you at the end.
- 6 The boundary-cost note. If the wall holds up a neighbour boundary, a plain-English note on how the cost usually falls (the benefit / whose-land-is-retained rule), so you can have the conversation. General guidance, not legal advice.
- 7 Warranty and compliance. The 10-year structural workmanship and drainage warranty in writing, and the AS 4678 / NCC compliance with the engineer design where the height needs it.
What happens, step by step.
Free site assessment and soil
We come to the block, measure the fall and the slope, check the soil and the access, and talk through material and height, then put a written quote in your hands.
Engineer design where the height needs it
For a wall over a metre or under a surcharge, the structural engineer designs it to AS 4678 and we lodge the council development application, so it is signed off before we dig.
Itemised quote and start date
The honest quote: face-metres, height and material, the footing, the drainage, the engineering line, excavation and the boundary-cost note. You sign off and we book the dig.
Footings and posts
We excavate, then size and set the footings: a reinforced concrete footing for besser, concrete-set posts dug to depth for sleeper walls. The footings cure before the wall goes up.
Drainage and wall build
The ag-pipe and free-draining aggregate go in behind the wall as it is built, with weep holes and geofabric, so water drains away instead of building up. Then the wall is built to height.
Backfill, finish and handover
We backfill and finish, clear the site, walk you around the wall, and hand over the warranty in writing and the engineer certification and approval paperwork where it applies.
The paperwork behind the price.
Public liability to $20M, and a 10-year structural warranty, all in writing, all on request.
We hold a South Australian builder’s licence, we build every wall to AS 4678 and the NCC, and we carry public liability insurance, so you are covered on site. For a wall over a metre, or one holding up a driveway or a building, we bring the structural engineer’s design and certification and handle the council development approval. The guarantee is a 10-year structural warranty, in writing, covering the structural workmanship and the drainage, the parts that fail first. All in writing, with exclusions named.
Core-Filled Besser Block Walls jobs we’ve done.
Core-Filled Besser Block Walls: common questions.
When do I need core-filled besser instead of sleepers?
What footing does a besser wall need?
Is besser block always engineered?
How is the drainage handled in a besser wall?
Get a free, itemised quote you can actually read.
Tell us what you need. We’ll book a walkthrough and send a quote with the work itemised, not just a number.