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- What is the minimum depth for unbonded screed?
Answer – Unbonded screed should not be less than 50mm for traditional screed, but modified screeds can be as little as 40mm.
- What is the minimum depth for bonded screed?
Answer – Bonded screeds can go to 15 mm in thickness, as long as it is bonded chemically (epoxy) or laid with SBR and SBR screed mix.
- What are structural screeds?
Answer – Structural screeds are very hard wearing and capable of withstanding heavy point loads, these tend to be used in certain environments such as industrial units and floors which will take excessive foot traffic and certain types of plant. CSC have a particular wealth of technical knowledge and experience in this sector, talk to our Technical Support team on 0845 500 4055.
- What type of floor screeding should I have in my new house/extension?
Answer – Both Free-Flowing and Sand & Cement screeds are the recommended for domestic use. Modified screeds such as FlexiDry offer stable, fast drying solutions allowing you to install your beautiful flooring earlier.
- What are the advantages of flowing screeds over traditional forms of floor screeding?Answer – Flowing screeds are good for laying in a large area over a short amount of time. The screed installation is faster but requires much more time for preparation.
- What reinforcment is the best option for an unbonded floor screed?
Answer – Reinforcement is a recommendation for use in screed constructions. There are various options that can be adopted which consist of fibres or mesh. The general purpose is to restrain the drying stress generated from the cement in a screed system. The reinforcement is designed to reduce cracks, it will hit the mesh / fibres and deflect the stress, therefore reducing the effect. If there are any specific structural reinforcement requirements then an engineer should be consulted.
- What is the tolerance for levels on floor screeds?
Answer. Departure from datum and Surface regularity are measured in different ways. Departure from datum can be +/- 15mm for large areas and +/- 10mm for small areas. Surface regularity is SR1 = 3mm under two meter straight edge on legs, SR2 = 5mm and SR3 = 10mm. CSC offer screeds to SR2 and SR1 is achieved by applying a latex compound which gives a fine surface finish to receive thin flooring finishes such as vinyl.
- Why should I use CSC Screeding Limited for my floor screeding works?
Answer – CSC Screeding are capable of managing complex technical demands, challenging project performance targets and tight budgets, gained over 23 years of experience.
- My underfloor heating system installer has told me that self-levelling ‘flowing’ screed is the best for UFH, why is this?
Answer – Under-Floor Heating installers have a limited knowledge of screed systems and we recommend you discuss your requirements directly with a screed contractor.
- What is the curing and drying time for floor screeds?
Answer – This varies depending on the type of screed, depth, environment in which it is being installed and if accelerated drying additives are being used as part of the screed system. Call our Technical Support on 0845 500 4055 to discuss in more detail. Do not attempt to lay floor finishes until you have carried out a moisture test.
- I’ve heard about shrinkage cracking & curling in floor screeds, what are these and how do they occur?
Answer – Cracking and curling can be caused by a number of reasons and inherent in cementitious screeds. A cracked floor is not necessarily a failed floor and remedies are recognized in BS8204 Part 1 2003, the current standard. Consideration needs to be given to the final floor covering to determine which level of repair is required. Please do not be alarmed if a crack appears in your screed, just pick up the phone and speak to the professionals for advice.