There are a number of different options when it comes to screeding to cover all job and costing requirements.
Firstly, a dry screed made up of a mix of sand, cement and water can be used (commonly to a ratio of 4:1). Although this can be the most economical option, there can be problems with cracking, therefore added fibres may be recommended to reduce this risk. There is also the option of using additives which provide the benefits of speeding up the drying time whilst preventing cracks. Secondly a liquid mix can be used of which there are two types. These can be beneficial as it can be hosed into place therefore large areas can be covered in shorter time periods. Both Anhydrite (or calcium sulphite) and liquid cement mixes can be laid in the manner. However the drying time may be longer with an Anhydrite Screed rather than the sand and cement mix.
Lastly a power floated screed is also available. This process is applied to a sand and cement mix whereby a finish is applied to the top of screed using specialized machinery. The benefits of this process are a smooth, flawless surface is given whilst increasing the durability and makes this more suitable for high traffic areas as well as areas where forklifts, for example are used. With all of these options the correct insulation and damp proofing should be installed prior to the laying of the screed. This may vary dependant on floor size and usage.
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