McErlean plastering are an approved provider of floor screed systems. A floor screed is usually a cement based material made from a mixture of cement and sharp sand. It may be applied onto either a solid in-situ concrete ground floor slab or onto a precast concrete floor unit. McErlean Plastering use traditional sand and cement screening stems and liquid screed systems.
The screed may be directly bonded to the base, with a minimum thickness of 40mm, laid unbonded onto a suitable damp proof membrane which is placed over the slab, with a minimum thickness of 50mm, or, if containing underfloor heating pipes a minimum of 65mm thick. Alternatively it may be applied as a floating finish over a layer of rigid insulation material where the screed should be a minimum 65mm thick or 75mm if it contains underfloor heating pipes. If reinforcement is required, this can either be in the form of a fine metal mesh or fibres which are normally polypropylene.
Our skilled floor screeding team can leave the surface as finished, or float the surface to produce a smooth finish on which to lay the specified flooring Screeds can also be used to enclose underfloor heating pipes or as a path to route services.
McErlean plastering can provide traditional ready-mixed sand and cement screeds that are factory-mixed and then delivered to site or alternatively we can mix and pump on site to suit your requirements of cost, access and timescales.
Using liquid screeds we can achieve very level finishes. They are quicker to apply than a traditional sand and cement screed and may be applied to a minimum thickness of 25mm if bonded, 30mm if unbonded, or 35mm if a floating finish is required. They can also be used in conjunction with underfloor heating systems where a minimum 30mm cover to the pipes is needed. Up to 2,000M²/day may be laid using these screeds. It is important to note however, that whichever type and depth of screed is specified, the decision should be made early in the design process.
Fast drying Floor Screeds
McErlean plastering have worked extensively with and are approved by Mapei for the installation of their fast drying floor screeds such as Topcem. These products are suitable for indoor and outdoor use in high traffic areas and their main benefit is that they allow a much faster drying process and are ideal for fast track construction schedules. This enables the use of the finished flooring much faster than traditional screeds which require a drying out period.Some application examples
- Formation of screeds set to light foot traffic after 12 hours.
- Formation of screeds on which ceramic tiles can be laid after 24 hours.
- Formation of screeds on which natural stone can be laid after 2 days.
- Formation of screeds on which resilient flooring and wooden flooring can be laid after 4 days.
- Patching and repairing floor screeds where rapid restoration is required.
- Preparation of screeds incorporating underfloor heating systems without the need for polymer additives.