Leading manufacturer and supplier of ready mix concrete, liquid screed and concrete pumps for the South West

Types of Concrete Mix and Their Uses


Concrete comes in many different forms, but can broadly be sorted into four categories: standard concrete, designated concrete, designed concrete, and proprietary concrete. There are a number of different grades within these categories.

The ‘best’ concrete to buy depends on the application you plan to use it for. Choosing the correct type is important because it ensures that your new build will be hard-wearing and stand the test of time.

Wright Minimix are one of the UK’s leading concrete specialists. We supply high-quality concrete solutions to the South West of England and South Wales, including ready-mixed concrete, liquid screed, and concrete pumps. In this guide, we cover everything you need to know about the different types of concrete, including their various strengths and applications.

Standardised Concrete


Standardised Prescribed Concretes (SPCs) are made with a prescribed quantity of materials issued by the British Standards body.

Relatively simple mixes, they are typically used for small scale jobs and mixed on site or obtained from a supplier. They have no strength guarantee or defined quality standards. There are five types:

Also known as wet lean mix concrete, this versatile mix is commonly used for a wide variety of non-structural applications.

Strength: Estimated at 7.5N/mm2 after 28 days


  • Drainage works
  • Backing
  • Haunching
  • Kerb bedding
  • Blinding
  • Cavity filling

A multipurpose mix used for unreinforced building and housing applications. When combined with a liquid screed finish, it is an excellent choice for house foundations and bases.

Strength: Estimated at 10N/mm2 after 28 days


  • Foundations for houses and extensions
  • Non-structural mass concrete
  • Unreinforced strip footings
  • Footings for fence posts
  • Small bases for patios
  • Drainage works
  • Blinding

Although ST3 is unsuitable as a wearing surface, it is frequently used for light domestic applications and bases. It can be used for internal floor slabs and house floors with no permanent finish flooring.

Strength: Estimated at 15N/mm2 after 28 days


  • Foundations for sheds, garages, greenhouses, and walls
  • Paving for patios
  • Trench filling
  • Blinding house floors

ST4 can be used as a wearing surface for light foot traffic. It is used for a range of domestic, industrial, and agricultural applications.

Strength: Estimated at 20N/mm2 after 28 days


  • Drain bedding
  • Benching to chambers
  • Unreinforced garage floors
  • Workshop and shed bases
  • Internal floor slabs

ST5 can be used in domestic, commercial, and agricultural projects, but only for light foot traffic applications.

Strength: Estimated at 25N/mm2 after 28 days


  • Foundations for columns and posts
  • Equipment storage spaces
  • Building ground floor slabs

Designated Concrete


Designated concretes are identified by their application, whether agricultural, industrial, or structural. They provide peace of mind that the chosen concrete will perform as needed, letting you skip the long process of specifying a designed concrete.

Providers of designated concrete must hold the appropriate level of product conformity certification, as approved by the BSI Standards Policy and Strategy Committee.

Designated concretes are sorted into General (GEN), Reinforced (RC), Foundation (FND), and Pavement (PAV) categories, each designed for a variety of applications.



GEN concrete is used for domestic and non-structural applications. It has a relatively low strength and durability level. The requirements specify a minimum quantity of cement to be included, but no water cement ratio.

Unless fully encased or covered,GEN concretes should only ever be used for internal applications.

GEN0 is a wet lean mix concrete often used in both commercial and housing projects.

Strength: Estimated at 7.5N/mm2 after 28 days


  • Domestic foundations
  • Cavity filling
  • Mass filling
  • Kerb bedding
  • Benching
  • Haunching

GEN1 is multifunctional concrete used for general building and housing applications.

Strength: Estimated at 10N/mm2 after 28 days


  • Foundations for conservatories, sheds, walls, and steps
  • Trench filling
  • Cavity filling
  • Mass filling
  • Blinding house floors
  • Kerbing
  • Drainage works
  • Haunching

GEN2 is perfect for domestic floors where no permanent finish will be installed, but carpeting or tiling will be.

Strength: Estimated at 15N/mm2 after 28 days


  • Trench fill foundations
  • Foundations for conservatories, sheds, and walls
  • Unreinforced strip footings
  • Unreinforced mass concrete fill
  • Paving for paths
  • Blinding

GEN3 can be used for light duty domestic foundations and applications. It can be used for domestic garage floors and to build unembedded internal floor slabs that will be covered by tiles, carpet, or laminate flooring.

Strength: Estimated at 20N/mm2 after 28 days


  • Foundations for houses, garages, and walls
  • Bases for driveways and sheds
  • Unreinforced bases and oversites for conservatories and greenhouses
  • Domestic garage floors (with no embedded metal)
  • Under paving for patios
  • Mass concrete fill
  • Trench fill foundations
  • Blinding

Designated Reinforced Concretes


Reinforced concretes are composites pre-stressed or embedded with steel. They are strengthened with added components to prevent cracking or corrosion.

Reinforced concretes have specified requirements for minimum cementitious content .and maximum water-concrete ratios. They are ideal for builds that will be exposed to highly demanding conditions.

RC25 concrete mixes can be used in parts of a building that require steel reinforcement.

Strength: Estimated at 25N/mm2 after 28 days


  • Lightly reinforced house or garage floors
  • Foundations, footings, and basement floors
  • Bases for sheds or outbuildings
  • Infill to insulated concrete formwork located above ground

This mix is suitable for mild exposure conditions, like pavements and driveways.

Strength: Estimated at 30N/mm2 after 28 days


  • Driveways, walkways, paths, stables, and patios
  • Internal areas for light foot and trolley traffic
  • Slabbing
  • Some reinforced foundations

RC28/35 is a strengthened concrete ideal for moderate exposure conditions.

Strength: Estimated at 35N/mm2 after 28 days


  • External slabbing, column bases, walls, and beams
  • Garages and workshops
  • Livestock and crop storage floors
  • Piling
  • Tank fill

RC32/40 is suitable for moderate to high exposure conditions.

Strength: Estimated at 40N/mm2 after 28 days


  • Agricultural tracks and roads
  • Floors and walls for slurry and manure storage
  • Cavity infill to reinforced masonry
  • Farmyards
  • Factory floors

RC35/45 is appropriate for high demanding exposure conditions.

Strength: Estimated at 45N/mm2 after 28 days


  • Toppings for floors in parlours and dairies
  • Floors and walls for silage or grain stores
  • Stable floors

RC40/50 is the hardiest of reinforced concretes, making it suitable for severe exposure conditions.

Strength: Estimated 50N/mm2 after 28 days


  • External yards
  • Heavy traffic areas
  • Stable floors
  • Toppings for floors in parlours and dairies
  • Floors and walls for silage or grain stores

Designated Paving Concrete


PAV1 and PAV2 concretes include freeze-thaw resistance and are intended for heavy-duty parking and drives. They are not suitable for power float finishes.

PAV1 mixes are frequently used for domestic pavement construction. They contain an additive that creates micro-sized air bubbles in the concrete, helping protect the surface from freeze-thaw cycles.

Strength: Estimated at 35N/mm2 on 28 days


  • Domestic pavements, parking, and carports (where no de-icing salts are used)
  • Reinforced and unreinforced bases for workshops and houses
  • Reinforced and unreinforced hard standings
  • Paved areas such as walkways and patios
  • External paving
  • House driveways

PAV2 is a heavy-duty concrete suitable for commercial and industrial use. It is resistant to frost and can be used with de-icing salts.

Strength: Estimated at 40N/mm2 after 28 days


  • Reinforced bases for commercial buildings and agricultural storage
  • Slabbing and paving with heavy vehicle and machinery traffic
  • External yards and roads subject to occasional de-icing salts
  • Heavy-duty outdoor driveways, pavements, and forecourts
  • Industrial external car parks
  • Mass concrete fills

Designated Foundation Concretes


As the name suggests, foundation concrete is used in foundations, specifically in those where the ground soil contains sulphates. Sulphates can cause normal concrete to soften, decay, or crack; foundation concrete is designed to withstand this deterioration.

FND2, FND3, and FND4 can be used in all types of un-reinforced foundations. Each is designed for a different soil type.

Strength: Estimated at 30N/mm2 after 28 days

Designed Concretes


As directed by European Standards, designed concretes are mixed to achieve a specific strength required for an application. Unlike standardised and designated concretes, they don’t specify the cement to water mix ratios.

Proprietary Concretes


Proprietary concretes are custom mixed by the producer for a specific application. They are used where high-performance or specific qualities are required. The producer will provide you with a performance guarantee.


Get a Quote From our Concrete Specialists 


Wright Minimix have been supplying premium concrete mixes to the South and Wales for over two decades. We can supply your project with ready-mix concrete of all types, as well as heavy-duty concrete pumps and equipment. No matter the size or scope of your project, you can rely on us for quality materials and a top-notch service.

Get a quote online or by calling us on 0117 958 2090. We’re happy to talk through your requirements and offer our recommendations on the best concrete type for your project.

Concrete Mixes FAQs


We suggest concrete mixes depending on application requirements and ground conditions. Contact a member of our expert team to discuss the details of your project and we will be able to suggest the best concrete mix to suit your needs.

This will depend totally on the size of your lay site. Use our useful concrete volume calculator to find out how much concrete mix you’ll require for your project.

If you do not have a credit account with us, then our preferred method of payment is by credit or debit card.

Cure time will depend on a number of factors, such as the type of concrete mix being used and external weather conditions, however, you should have at least between 1-2 hours in which to lay the mix. We will be able to advise you more accurately once we have more details, so don’t hesitate to contact us. 

All of our concrete delivery vehicles come with chutes that can deliver ready mix concrete up to approximately 2.4m away from the rear of the vehicle and 1.2m from the side. If your lay site has restricted access that would make delivery by normal means impossible, then one of our concrete pumps for hire would be able to transport the concrete to your lay site with ease.

The minimum width required for our vehicles is 2.7m or 8ft 10 inches. If you believe that entry to your site would be particularly tricky for one of our delivery vehicles, then we would be happy to arrange for one of our team to inspect your site beforehand. You can also request delivery through our mini pump, which is perfect for accessing lay sites that are too hard to navigate for larger vehicles.

If you wish to move the concrete mix yourself i.e. with a wheelbarrow or dump truck, then you should request your ready mix concrete at a lower slump. This will mean that it is drier and therefore easier to transport manually. Please let us know in advance if you wish for our concrete mixers to offload directly into your wheelbarrow, so that we can schedule appropriately.

Our delivery trucks remain on site for an allotted time of 30 minutes. If you require the delivery truck for longer than this time, then this may incur you a waiting time charge.

Yes – without tamping, vibrating, or compacting, air pockets would remain trapped inside the wet concrete mix. These air pockets could seriously weaken the overall structure of the concrete, making it weaker and less durable than it would be if the concrete was made denser. When reinforcing metal is used, this method also ensures that the concrete best bonds to the metal.

Concrete mixes can be harmful if not handled correctly. That is why we always suggest wearing the appropriate safety gear and following these guidelines when handling our ready mix concrete or liquid screed:

  • Fresh concrete or screed can cause burns to the skin and eyes, so wear protective clothing (impervious boots, goggles, gloves, long sleeves and trousers)
  • If concrete makes contact with your skin or eye, then wash it off thoroughly or rinse from your eye immediately.
  • Do not swallow. If any concrete mix is ingested, seek immediate medical advice.
  • Once finished, remove your clothing and wash it thoroughly before reuse.


We have a large fleet of delivery vehicles in a range of sizes and capacities (length + width + height = capacity):
6.5m + 2.5m + 4m = 4m3
7.5m + 2.5m + 4m = 6m3
8.7m + 2.5m + 4m = 7.5m3

We are the right people for you – let’s work together!
Contact us on 0117 958 2090 today to get a quote or to find out more.

Bristol Brick Company - Coming Soon!
26th September 2023

Introducing the LGW Group’s latest venture: Bristol Brick Company! 

Operating out of a brand-new, £10 million purpose-built facility in Avonmouth, our new sister company will manufacture premium-quality concrete blocks and bricks for both residential and commercial projects, with trials scheduled to begin in October.

Managing Director of Wright Minimix and the LGW Group, Len Wright, had this to say about the project:

"I never thought when I started on this venture back in 1997 I’d be supporting the team with a £10m investment.

I’m so proud of my team even during tough times they come through and it with great pride I am supporting this venture. They proposed it they prepared the business plan and I’m confident they will deliver!

I once said you don’t take me on you take us on, now I can honestly say you won’t be taking me on you will be taking them on!"


bristol brick company groundworks

How it started...

bristol brick company progress

How it's going!

Attend The Open Day!


Bristol Brick Company is hosting an open day on Thursday 12th October. You'll be able to view the plant and machinery, ask questions and network with likeminded people.

There will be a hog roast, tea, coffee and a bar running from 11am - 6pm.

The team would love to show you their new labour of love, built through hard graft, determination and by good local people! Why not take an hour out of your day to pay a visit?

Reserve Your Spot

First UK Plant Powered by ROMETA® 


Not only is the concrete block plant brand new, but it’s also the first of its kind in the UK to be powered by ROMETA® machinery! 

With over 65 years in the industry, ROMETA® is a leading supplier of concrete block manufacturing equipment in Europe. Each ROMETA® machine is customised to fit the site’s specific requirements, which will allow Bristol Brick Company to produce concrete products of exceptional quality each and every time. 

The components in ROMETA® machinery are sourced from renowned international suppliers of electrical and hydraulic equipment. By incorporating the latest cutting-edge technologies, these machines significantly boost efficiency whilst embracing sustainability. This is in line with Bristol Brick Company’s commitment to eco-friendly practices.

bristol brick company machine
bristol brick company machinery

If you have any further questions regarding the Bristol Brick Company Opening Day, please contact lucy@wrightminimix.co.uk.

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Is Ready Mix Concrete Cheaper Than Manual Mixing?
03rd July 2023

No matter what building project you’re working on, the goal is the same: achieving high-quality results without exceeding your budget. This is true whether you’re laying the base of a shed, building a house foundation, or constructing a towering skyscraper.

It’s a delicate balance. Spending too much on materials can quickly drain your budget, but skimping on them could lead to poor results (and even potential safety issues).

With over 20 years of experience, the team at Wright Minimix know concrete better than anyone. We understand how important it is to consider the costs of your project before you get started, which is why we’ve explored the costs of using ready mix concrete compared to manual mixing below. Let’s dive in!

What is Ready Mix Concrete?

Well, it’s exactly what it says on the tin: ready mix concrete is a premixed concrete that arrives at your worksite ready for use.

More specifically, ready mix concrete is manufactured in a batching plant or factory according to specific mix designs. Once the concrete is mixed, it’s loaded into specially designed trucks called transit mixers. These trucks have revolving drums to keep the concrete in a workable state during transportation. The concrete is then delivered to the construction site within a specific time frame to maintain its fresh properties.

At the construction site, the ready mix concrete is discharged from the transit mixer directly into forms, moulds, or designated areas. It can be immediately poured or pumped into position without the need for on-site mixing. Thanks to its convenience, quality, and time-saving benefits, ready mix concrete is a popular choice throughout the construction industry.

What is Manual Concrete Mixing?

Manual concrete mixing, also known as on-site concrete mixing, is when you prepare concrete directly at the construction site. It involves blending the cement, aggregates, water, and admixtures yourself, and then monitoring and adjusting the mixture as needed.

Manual concrete mixing is commonly used for small-scale projects and repairs. It requires a skilled workforce and proper knowledge of concrete mixing techniques to guarantee the quality and consistency of the final product.

Will Using Ready Mix Concrete Save Me Money on My Project?

In most cases, yes! The upfront cost of ready mix concrete tends to be higher than manual mixing, but there are plenty of ways it saves you money in the long term.

  • One of the biggest benefits is the time you’ll save. Ready mix concrete is delivered to your site in a ready-to-use form, eliminating the need for on-site mixing and curing. This can hugely speed up construction, especially for large-scale projects. Faster completion times save you money by reducing overhead expenses, such as equipment rental and labour.
  • Ready mix concrete is produced in a controlled environment with precise ingredient measurements. More accurate batching reduces material wastage and the costs associated with disposing of it. The use of automated batching plants also minimises the need for excess materials, as the right proportions of cement, aggregates, water, and admixtures are always used.
  • By using ready mix concrete, you won’t need to mix, measure, and monitor the ingredients on-site. This allows your workforce to focus on other essential construction tasks, improving overall productivity and reducing labour costs.
  • Ready mix concrete goes through strict quality control measures, resulting in a consistent level of quality throughout. This can help avoid the expenses associated with rework, repairs, or project delays caused by poor-quality concrete.
  • Manual mixing requires equipment such as mixers, storage containers, and tools, which can add to the project's equipment costs. By using ready mix concrete, you won’t need to spend money buying or renting on-site mixing equipment.
  • Ready mix concrete is delivered directly to your construction site in specialised trucks. This means you won’t need to arrange for on-site storage facilities. It also reduces handling and transportation efforts, as well as the potential costs of material storage, theft, or contamination.

In summary, ready mix concrete can save you money thanks to its consistent quality, time and labour savings, reduced waste, and rigorous quality control.

Save Money with Wright Minimix’s Premium Ready Mix Concrete

At Wright Minimix, we supply and deliver ready mix concrete throughout the South of England and Wales. We put cost and efficiency at the forefront, delivering your concrete on time and within the agreed budget. We also have a wide range of concrete pumps for hire, including the largest pump in the UK!

No matter the scope of your project, we have the perfect ready mix concrete solution for you. Our range includes prescribed mixes, designated mixes, and standardised prescribed concrete mixes, all conforming to British Standards (BS8500-2).

With a full guarantee on all our ready mix concrete mixes, we aim to save you money by only charging for what you’ll actually use, while still providing the high-quality concrete you need to complete your project successfully.

Get a quote online or call us 01179 582090 - we’re looking forward to working with you!

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How to Test for Concrete Slump
16th November 2022

A concrete slump test is a method of measuring the consistency of fresh concrete. It’s a simple and easy way to check the workability of multiple batches before they set.

Wright Minimix are industry-leading concrete specialists, supplying ready-mix concrete and liquid screed across the South West. In this post, we explain what a slump test is, why it’s necessary, and how to carry one out.

What is a concrete slump test?

A concrete slump test is a routine procedure for seeing how easily a batch of concrete will flow. It’s low cost, easy to carry out, and produces immediate results.

Why perform a concrete slump test?

Before laying concrete, it’s important to check all batches have the same consistency. This ensures a constant quality and strength throughout. A slump test reveals the water-cement ratio, letting you know whether more or less cement needs to be added to the mix.

Too much water will weaken a mix. If you require a higher workability, you must raise the amount of cement within the mix.

What is the method for carrying out a concrete slump test?

To carry out a concrete slump test, you’ll need a slump cone, a measuring stick, a steel rod, and - of course - the concrete itself. Follow the steps below to find out the slump result of your concrete:

  1. Place the slump cone on a flat surface and stand on the footholds either side.
  2. Pour a layer of concrete into the cone, and use the steel rod in a circular fashion to smooth and compact it around 25 times. Make sure to penetrate the previous layer by about an inch. Repeat this with another layer of concrete on top.
  3. Pour in one final layer and rod it 25 times. The rod should penetrate the second layer, but not go through it fully. If the concrete is compacted beneath the top of the mould, stop rodding and add more concrete, then continue.
  4. After pouring the layers, clear away any overflow from the top and base of the cone. Double check the concrete reaches the top level of the cone.
  5. Slowly lift the cone up, shaking it gently until it is free of the concrete. Place the cone upside down next to the concrete, which will soon start to slump.
  6. Lay the steel rod across the top of the upturned cone so it hangs over the concrete.
  7. Measure the distance from the rod to the top of the slump. The level of slump is measured to the nearest 1/4 of an inch. The recorded results are the slump of the concrete.

Talk to the South’s concrete specialists

Wright Minimix have been delivering premium concrete solutions for over two decades. Whether you’re in need of ready-mix concrete, concrete blocks, or a heavy-duty concrete pump, we’ll be there to provide it on time and on budget.

Get a quote online or by calling our friendly team on 0117 958 2090.

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The Complete Guide to Concrete Footings
07th September 2022

Whether a house, deck, or bridge, every structure needs a strong footing to stand on. 

Concrete footing lies at the very lowest point of a foundation. Responsible for supporting the weight of an entire building, the footing must be strong, durable, and sturdy enough to last years under heavy strain. 

Poorly built concrete footing risks cracking or sinking into the ground. In extreme cases, it can even cause the building to collapse altogether! 

For these reasons, laying out concrete footing correctly is a crucial part of the construction process. 

Wright Minimix are specialists in all things concrete. We have extensive knowledge about using concrete for a variety of applications, and have years of experience working on projects across the south west. 

In our guide to concrete footings, we cover everything you need to know about correctly laying a footing, from determining the right concrete mix to proper site preparation. 


What are Concrete Footings? 


Footings are the solid concrete at the very bottom of a structure. They distribute the weight of a building across an area, preventing it from sinking into the ground. 

Footings are usually the first thing you build when starting a new construction project. Because they need to support a significant amount of weight, footings must be made of very strong concrete. It should be at least 3500 psi (pounds per square inch). 

There are several different types of concrete footings: footing under a single column, footing under multiple columns, and wall footings. 

Concrete has high compressive strength, meaning it can withstand heavy loads without fracturing, but low tensile strength. This means too much weight can cause it to elongate. For this reason, the concrete mix is usually reinforced with horizontal and vertical rebars. 


What is the Best Concrete Mix for Footings? 


The mix you use is one of the biggest factors in determining how strong your concrete footing will be. 

Much of this revolves around the aggregate (the stone and sand used in the mix), as the aggregate is what gives concrete its strength. It makes up the bulk of the concrete and adds to its overall compressive strength. More stone means a stronger mix. 

However, using overly coarse or oversized aggregates can cause “honeycombing.” Honeycombing refers to the gaps in the concrete caused by large pieces of aggregate sitting against the rebar, creating an effect that visually resembles a honeycomb. Honeycombing can be fixed by adding finer aggregates and more concrete to the mix, and by mixing the concrete more thoroughly. 

For concrete footings, the best mix to use is: 

  • 1 part cement 
  • 2 parts sand 
  • 4 parts stone (aggregate by volume) 


What aggregate size should you use for concrete footings?

The aggregate should be around 1/2 – 1 inch in size. After 28 days of curing, this mix will yield a 3500 psi. 


Ready Mix Concrete for Concrete Footings

Although you can mix the concrete yourself, the most time and cost-effective way is to buy a ready mix. With ready-mix concrete, you can skip the laborious process of measuring and mixing and get straight to pouring. 

At Wright Minimix, we create ready-mix concrete to your exact specifications. Because each mix is custom made, there is little or no wastage. There is also no need to have a labourer mix the cement on site, nor do you need to make space for storage. 


How Do You Lay Concrete Footings? 


The exact method will depend on the structure’s size, shape, and location. It’s also important to note that laying a footing is a complex process that requires significant expertise. Make sure you’re working with experienced professionals who can carry out the process correctly. 

With that in mind, here is an overview of the general process: 


1. Prepare the Site 

Before you do anything, it’s important to analyse the condition of the soil on site. The size and dimension of your footing depends on the soil’s load bearing capacity. Soft or troublesome soil requires special care, as there is a high risk of the concrete sinking into it. 

You should also clear out grass, roots, and debris from the idea, and identify the layout and corners of your foundation so it can be structured correctly. 


2. Dig the Trench 

Once you’ve determined how wide and deep the trench should be, you can begin digging. 

The hole for your footings needs to be bigger than the foundation, so you and your workers have room to lay down the footings. There should be at least 2 feet on all sides. 

The perimeter hole should be at least 2 feet wide by 2 to 3 feet deep. Make sure to clear out any remaining dirt and plantation afterwards. 


3. Set the Rebar 

Rebar support beams prevent the concrete from cracking or crumbling. You should set your rebar in place, then attach the grade pins on top. Each grade pin should be about 2 feet apart from one another, and a foot away from the corners. 

Make sure that the rebar is an equal distance from the sides as it is from the base of your opening. 


4. Mix and Pour the Concrete 

If you’re using a ready mix, you can skip straight the pouring. Depending on the size and location of your site, a concrete pump may be your best option for this. 

Wright Minimix has a fleet of concrete pumps available, big and small. This includes our compact Minipump, ideal for hard-to-access sites, as well as the largest concrete pump in the UK

If you’re preparing the concrete yourself, make sure the ratio of cement, aggregate, and water is correctly measured out before mixing. 

Once the concrete is prepared, pour it into the trench. This must be done within thirty minutes of mixing. 

The final step is to protect your footing from moisture and damage with an industrial-quality, acrylic-based sealer. 


Trust Wright Minimix for Your Concreting Needs

Need a reputable concrete supplier for your project? No matter what kind of structure you’re working on, we have the exact type of ready-mix concrete you need. Get in touch to arrange concrete for your footing today!

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