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How to prepare for laying screed from Wright Minimix

Preparing liquid screed


As established concrete experts, we are ideally positioned to provide guidance on the best way to prepare for laying screed.

Why not take a look at our instructions below, but if you require further information or if you have any questions, please don’t hesitate to contact us.

Wright Minimix - Liquid Screed

Minimum cover above pipes is 30mm therefore minimum screed thickness is normally 50mm when using a 16mm U/F pipe.

A membrane of 1000 gauge or thicker should be laid immediately under the pipe work (above the insulation board) as a slip layer, and to prevent leakage of the screed before setting.

Ensure pipe work is fully clipped especially around bends, and that the system is full of water prior to the floor being laid, this avoids the pipe work floating to the surface of the screed.

Any shuttering across doorways or steps should be fully sealed with expanding foam or mastic to prevent leakage after laying but before setting.

Pipe ducts or holes through walls also need to be sealed before placement of the screed.

If you are using an ‘eggbox’ type pipe system, the membrane should be laid under the eggbox, and you should avoid using small off-cuts of eggbox to avoid any possibility of floating.

Minimum cover is 40mm.

A membrane of 1000 gauge or thicker should be laid on top of the slab to act as a slip layer, and to prevent leakage of the screed during placement.

Any shuttering across doorways or steps should be fully sealed with expanding foam or mastic to prevent leakage before setting.

Pipe ducts or holes through walls also need to be sealed before placement of the screed.

Minimum cover is 40mm.

A membrane of 1000 gauge or thicker should be laid on top of the slab to act as a slip layer, and to prevent leakage of the screed during placement.

Any shuttering across doorways or steps should be fully sealed with expanding foam or mastic to prevent leakage before setting.

Pipe ducts or holes through walls also need to be sealed before placement of the screed.

Often sub-floors slope or are uneven which when using a randomly chosen datum point may cause unexpected differences in the overall floor level and in the quantity of screed required. It is the customer’s responsibility to agree datums in each room / area or across the whole floor area if the rooms are seamlessly linked. 

This / these datum(s) will need to consider critical features such as door openings, minimum thicknesses / cover or required differentials in floor height between rooms for matching in tiling with carpeting for example. These datums must be agreed prior to commencement of the laying and marked on the wall above the level of the finished screed so that they are present after the event for comparison should a disagreement be raised about finished floor levels. Any such disagreement must be brought to our attention within 48 hours.

Should these datums be removed or altered prior to any investigations then we will not be held accountable for any level issues.

Should extra product be required over that originally ordered due to datum issues and this requires an extra delivery to site and extra time for laying then we will charge these extra costs to the client so it is essential that a proper estimate is made by the client to avoid this circumstance.

Do you have any screed requirements? 
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.

What is the difference between concrete and liquid screed?
15th March 2018

If you are new to the world of DIY concrete, then you’d be forgiven for not knowing the difference between ready mix concrete and liquid screed; after all, both are made using almost the exact same components. However, both concrete and liquid screed are very different in their texture and in what they are used for.

How is liquid screed different from ready mix concrete?

Ready mix concrete is prepared at a plant to each clients individual specifications using defined measurements of aggregates, sand, water and cement mixed together with any desired additives to achieve the required result, such as enhanced strength or faster curing times.

Liquid screed also contains these components, however, what makes liquid screed different from ready mix concrete is the amount and size of the aggregates used compared with ready mix concrete. Using smaller and fewer aggregates results in a smoother consistency and easier flowability, making the screed closer to a liquid than a solid. On the other hand, the coarse aggregates used in ready mix concrete give concrete the added strength that makes is more suitable for structural building jobs.

What are ready mixed concrete and liquid screed used for?

Due to their different consistencies, concrete and liquid screed are used for different purposes in construction. Uses for ready mix concrete involve mostly external use in structural foundations, pathways, driveways, fences, cellar conversions, paving, conservatories, and anywhere else that a strong and long-lasting result is of the utmost importance.

Liquid screed on the other hand, is only used internally and is used to create a smooth finish. The flowability of liquid screed means you don’t have to worry about any lumps and bumps on your flooring and can be used to create a protective layer over an existing concrete floor. Liquid screed can also be used to make the most of your underfloor heating system, as its flowability means that it lays flush against pipework in a way that regular concrete would not, eliminating air bubbles and maximising conductivity.

Are you looking for ready mix concrete or liquid screed for your DIY or commcercial concreting  project? We can supply you with quality ready mix concrete and liquid screed tailored to suit your requirements. Don't hesitate to contact us to discuss your project with us 0117 9582090.

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How to lay a concrete shed base yourself
05th March 2018

Are you considering constructing a shed yourself but aren’t sure where to start? First of all, your shed will need a solid foundation, so follow our step by step guide to laying a concrete shed base the right way on the first attempt using ready mix concrete.

Why ready mix concrete?

Ready mix concrete is the perfect way to save yourself time on your DIY project, especially if you are undertaking it alone. Mixing concrete by hand is only viable for very small lay areas and is a lengthy process that requires you to know measurements, ratios and to know when the concrete is mixed correctly by just looking at it. 

Our ready mix concrete is quality assured to British governing standards and is delivered straight to your door ready for you to lay. Simply use our handy concrete volume calculator tool to find out how much ready mix concrete you will require for your shed base and contact us to get started!

What next?

1 - Mark out your site
Locate a level, even patch of land for the locations of your shed base, otherwise you may struggle. After you’ve measured out the area you want to cover, you’ll need to mark out where you want your base to go using stakes and string. 

2 - Create your sub-base
You’ll need to install a sub-base of compact hardcore before you lay your concrete base. To do this, you’ll need to remove the lawn and any weeds, digging to approximately 15cm deep. This allows for 7.5cm of compact hardcore and 7.5cm of concrete. You then need to lay the hardcore and compact it using vibrating plate compactor or earth hammer. 

3 - Construct your framework
You’re now ready to start preparing for the concrete. Good wooden framework will mean that you are left with a much neater end result. Saw your timber planks to the correct lengths and use hammer and nails to attach them together. Use a builder’s square to ensure that your frame is 90 degrees exactly to ensure you avoid a wonky base!

4 - Receive and lay the concrete
From the moment your concrete arrives, you’ll only have around 1-2 hours to get it laid and levelled before it starts to cure, so you need to act fast. We can deliver the ready mix concrete straight to your shed base location using one of our concrete pumps if you wish, or it can be dumped through a chute straight into your wheelbarrow for you to transport yourself. Ensure that you are wearing the right protective clothing for handling hazardous concrete.

Pour the concrete into the framework and use a rake or shovel to spread the concrete evenly. At this stage, it doesn’t matter if it is higher than the framework slightly.

5 - Start tamping
Tamping is an important step not to be neglected in the lay process and ensures that air bubbles which could compromise the durability of your shed base are removed. Using a wooden plank that is the width of your shed base, lift and lower it rapidly over the entirety of the concrete to level the surface to bring it in line with the top of the framework. 

6 - Protect your base
A polythene sheet over the surface of your concrete will project it as it cures. Do not remove the framework until the cure process is complete. We will be able to advice you on how long the cure process will take once we know the details of your project and can offer additives which can speed up the process if you require.

For more information about our ready mix concrete, concrete pumping services and concrete mixes, contact our team today on 0117 958 2090.

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Is volcanic ash the key to stronger and greener concrete?
16th February 2018

Could our future buildings be constructed out of cement mixed with volcanic ash? This is what scientists from the Massachusetts Institute of Technology and Kuwait Institute of Scientific Research have been trying to find out by analysing how adding volcanic ash could potentially reduce energy costs during production and create stronger concrete mixes.

Increased strength

Volcanic ash was an ingredient used by the Romans in the mixing of their concrete over 1,500 years ago and many of the resulting structures are still standing today - a testament to the mixture's durability. Research found that pulverizing the volcanic ash down into finer particles and mixing with cement produced stronger concrete structures than regular cement used today. However, reducing the volcanic ash down to smaller particles used more energy, so to achieve stronger concrete, there must be a trade off with the amount of energy used to create it. Researchers argue that this gives concrete manufacturers the flexibility to customise their concrete, saving a lot of energy on jobs that don’t need to prioritise strength.

An environmentally friendly additive

Volcanic ash is largely considered a waste product and is in abundant supply and easily accessible in multiple locations around the world. In normal concrete production, rocks such as limestone need to be removed from quarries and further crushed and heated at very high temperatures to be used in cement. Volcanic ash on the other hand has already undergone this process naturally, greatly reducing costs needed to prepare it for use in cement.

According to the findings, which were published in the Journal Of Cleaner Production this week, the new ready mix concrete consisting of 50% volcanic ash and 50% regular cement would take 16% less energy to construct a neighbourhood of 26 concrete houses in comparison to regular Portland cement. Concrete production is the second most widely used building material after water and accounts for 5% of the world’s overall carbon dioxide emissions, the potential for volcanic ash as an additive to ready mix concrete is therefore a huge step towards overall greener concrete production.

We supply ready mix concrete made to your bespoke specifications. Whether for DIY or commercial purposes, we have you covered! For more information on our concrete pumps, ready mix concrete and liquid screed, contact us on 0117 9582090.

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Why consider hiring a concrete pump?
08th February 2018

A concrete pump is a quick and efficient way to get ready mix concrete or liquid screed laid both on time and within budget. Our concrete pumps for hire are suitable for DIY and commercial projects alike and are an excellent choice for sites with restricted access, or that require large quantities of concrete or screed flooring.

Saves time and money

Perfect for projects with strict budget and time constraints, concrete pumping saves you valuable time and manpower that you would otherwise have used transporting the concrete by wheelbarrow or other manual means. By allowing our concrete pump to take care of the delivery directly to your site, you can save yourself a lot of time and therefore money that would have been spent paying for the extra labour on-site, allowing you to divert it elsewhere.

Access difficult lay sites

Transporting concrete to difficult to access lay sites, such as a busy construction site, upper or underground floors, a wooded area, or an overgrown garden, can be a time-consuming and sometimes insurmountable challenge. A concrete pump is unaffected by these obstacles and can deliver ready mix concrete or liquid screed directly to any lay site much more efficiently than you could hope to manually. We not only have the largest boom pump in the UK, capable of a reach of up to 62 metres, but also a boomless minipump, which can tackle those sites that a boom pump can’t access, such as tricky interior jobs.

Less waste

Manually moving ready mix concrete via wheelbarrows will always result in some accidental spillages, or even complete tip-ups, and therefore waste. Concrete pumping eliminates this wastage and saves you the potential hassle of attempting to clean up concrete from where it doesn’t belong. As well as concrete pumps for hire, we also supply ready mix concrete and liquid screed made to your bespoke specifications, so you only pay for what you use!

Are you interested in a hiring a concrete pump for your DIY or commercial project? For more information on our concrete pumps, ready mix concrete and liquid screed, contact us on 0117 9582090.

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