Which Screed Is Right For You?

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There is a wide variety of screeds available and choosing the correct type for your project can prove to be confusing. Here, we will try and simplify the decision-making process and give you some examples to help you get an idea of which screed would be correct for you.

Free Flowing, Self-Levelling Anhydrite Screed

This product is rapidly growing and is now the most commonly used. Here at Mitchell Plastering & Dry Lining Ltd, we would advise the use this product for projects such as houses and extensions, nursing homes, care homes, apartments, shops, offices and many more.

Anhydrite screed can be laid at a minimum of 25mm to an existing concrete slab and a minimum of 40mm is required if laid onto insulation.

There are a few different methods used while using this screed:

• Bonded
• Unbonded
• Floating

Bonded: A primer or bonding agent is applied directly to the subfloor before the screed can be laid. This method is commonly used if the required depth is under 40mm.

Unbonded: This method is achieved by using a polythene layer to separate the existing concrete and the screed. If a depth of 40mm or greater is required, then this method would be advised.

Floating: This term is used if the screed is to be placed onto insulation. A damp-proof membrane (DPM) would normally be laid before insulation. Another separating polythene layer would be added before the screed is applied. This method is most commonly used in residential builds to achieve the required thermal conductivity.

Anhydrite screed is also the best product to use with underfloor heating. Further information on this is displayed on our underfloor heating page.