Shed Slabs Warragul

Slabs for kit sheds and farm sheds

Kit sheds, from a small garden shed to a large farm machinery shed, all need a concrete slab that is engineered to carry the building and its contents. The slab thickness, reinforcement and edge beam design depend on the shed span, the column spacing and what the shed will hold. We pour slabs for the full range of kit sheds, including workshops, garages, barns, stables and machinery sheds.

For a residential kit shed on a Warragul block, a 100mm slab with mesh and thickened edges is often enough. For a workshop with a hoist, a garage for heavy vehicles, or a farm machinery shed housing a tractor and implements, we increase the thickness to 125mm or 150mm and upgrade the reinforcement. We assess the shed, the load and the soil during the free site visit and specify the right slab for the job, so the floor of your shed is built to carry whatever you put inside it for the long term, without cracking, dipping or settling over the years.

What we need from your shed supplier

Before we pour a shed slab, we need the shed plans from your supplier, including the slab plan, the bolt-down detail and the column locations. The slab plan shows the shed span, the column spacing, the edge beam dimensions and any specific requirements from the shed manufacturer. This tells us where to thicken the edge, where to place the hold-down bolts and what the slab needs to carry.

If you have not chosen a shed yet, we can still give you a quote based on the size and use you have in mind, and we can advise on what to ask the shed supplier for. Most kit shed manufacturers provide a slab plan as part of the kit, and we work to that plan. If your shed needs a building permit, the slab will be specified by the engineer and we pour to that specification.

Thickness and reinforcement by shed size

The thickness and reinforcement of a shed slab scale with the shed size and the load. A 6m by 6m garden shed on a residential block may only need a 100mm slab with a single layer of standard mesh. A 12m by 9m machinery shed on a Drouin farm needs 150mm with heavier reinforcement and deep edge beams to carry the weight of a tractor, implements and possibly a loaded truck.

The edge beams are critical because the shed columns sit on the perimeter and concentrate the load. We form the edge beams by trenching the perimeter to the required depth and width, placing the reinforcement, and pouring the edge beam as part of the slab. This gives the columns a solid foundation and prevents the slab edge from cracking under the point loads. We match the edge beam size to the shed span and the soil.

Farm and machinery sheds

Farm and machinery sheds are one of the most common rural jobs we pour across Baw Baw Shire. These sheds house tractors, implements, hay, feed and sometimes livestock, and the slab has to handle heavy point loads, vehicle traffic and the wear and tear of country life. We pour these slabs thicker, with heavier reinforcement and deeper edge beams, so they carry the load without cracking.

On a rural block, the shed slab may also need to handle a hoist, a welder or a parts wash, so we can finish the surface smooth for easy cleaning and include a fall toward the door so water and debris can be washed out. We also handle the site preparation, including the cut and fill to create a level platform, the compaction of the sub-base, and the drainage to keep water away from the slab edge. See our concrete slabs page for more on slab types and specifications.

Site access for trucks and pumps

Access is often the challenge on rural blocks, with long driveways, paddock conditions or sloped sites that a concrete truck cannot easily reach. We plan the pour around the available access, including using a concrete pump where needed. A pump lets us place the concrete precisely, even on sites where the truck cannot get close to the slab, and it speeds up the pour on larger sheds.

We assess the access during the free site visit and factor it into the quote, so there are no surprises on pour day. If a pump is needed, we arrange it as part of the job. We also plan the delivery sequence so the concrete is placed and finished within the right time window, which is especially important on large shed slabs where the volume of concrete means multiple truckloads.

Wet-ground preparation

West Gippsland receives close to 900 millimetres of rain in a typical year, and pouring a shed slab on wet ground is a common challenge. We never pour on saturated clay, as the water weakens the sub-base and the concrete will not achieve its full strength. Instead, we excavate to the subgrade, compact a granular sub-base that drains freely, and wait for the base to dry before pouring.

On sites with heavy groundwater or clay that holds moisture, we install agricultural drains, a slotted pipe wrapped in aggregate and filter cloth, to collect subsurface water and direct it away from the slab. This keeps the ground under the slab dry and stable through the wettest months. We also time the pour to avoid the worst of the forecast, so the concrete is not damaged by rain before it has hardened. If the ground is too wet to pour, we wait rather than risk a slab that will not perform, because a few days of patience is far better than a shed slab that fails because the base was saturated when the concrete went down.

Timeline from pour to frame

A shed slab is walkable within a day and can take the weight of the shed frame within a week, depending on the slab thickness and the concrete strength. We advise the shed installer on how long to wait before erecting the frame, and we recommend waiting at least seven days before bolting down the columns or loading the slab with heavy materials.

For a standard kit shed slab, the timeline from site preparation to a cured slab ready for the frame is typically one to two weeks, depending on the weather and the size of the pour. We schedule the pour to suit your shed delivery and the installer's timeline, so the slab is ready when the shed arrives. We are local, so we are close by if you have any questions after the pour.

For larger shed slabs, such as a machinery shed or a multi-bay farm shed, the timeline may be longer due to the volume of concrete, the complexity of the edge beams and the need for multiple truckloads. We plan the pour sequence so each section is placed and finished within the right time window, and we coordinate the delivery schedule so the concrete arrives in the right order. We also factor in the curing time before the shed frame is erected, which may be longer for a larger slab in cold, wet West Gippsland weather, and we communicate with the shed installer so the timing works for everyone.

Shed slab cost drivers

The cost of a shed slab is driven by several factors, and understanding them helps you plan your budget. The area of the slab is the biggest driver, as it determines the volume of concrete, the amount of reinforcement and the time on site. A larger shed needs more of everything, and the cost scales accordingly. The thickness also matters, as a 150mm slab uses significantly more concrete than a 100mm slab for the same area, and a thicker slab needs heavier reinforcement to match.

The edge beams are another cost factor, as they require additional excavation, formwork and concrete. Deeper edge beams for larger sheds or more reactive clay sites mean more work and more material. The reinforcement also varies, from a single layer of standard mesh for a garden shed to heavier mesh or bars for a machinery shed, and the cost of the steel is a significant part of the total. The finish also affects the price, with a plain trowel finish costing less than an exposed or stamped surface.

Site access and preparation are the other main drivers. A flat, easy-access site with good ground costs less to prepare than a sloped site with poor access that needs a concrete pump, extensive cut and fill, or drainage works. The timeline also matters, as a larger shed slab may need multiple concrete truckloads and a longer day on site. We give you a clear, itemised quote after the free site visit so you can see exactly what is behind the price and make an informed decision about your shed slab.