Screed — known in Arabic as اسكريد — is the level, stable layer that sits between the structural slab and your final floor finish. When it is done well, nobody notices it. When it is done badly, tiles crack, vinyl shows every bump and epoxy coatings fail. Choosing the right type of screed for the job is the first step to a floor that lasts.
What screed actually does
The structural slab is rarely flat enough to receive tiles, vinyl, carpet, timber or resin finishes directly. Screed evens out the surface, brings the floor to the required level, and provides a firm base that carries the finish. It can also cover services and, in some systems, incorporate underfloor heating or insulation.
Traditional sand-cement screed
This is the general-purpose option for villas, apartments and offices. A mix of sand and cement is placed, compacted and levelled by skilled screeders, then cured. It suits tiles and most common floor coverings. The quality of the result depends heavily on workmanship: correct mix, proper compaction, accurate level control and good curing.
Self-leveling screed
Self-leveling screed is a flowing mix that finds its own level, giving a smooth, highly accurate surface with a fast, clean finish. It is a strong choice for premium floor coverings and large open spaces where tight tolerances matter. It needs a properly prepared and primed base, and edges and openings must be sealed before pouring so the mix does not escape.
Laser-guided screeding
For warehouses, factories, logistics centres and large retail floors, laser-guided equipment places and levels big slabs quickly and consistently. It delivers flatness that manual methods struggle to match over large areas, which matters where forklifts, racking or automated systems are used. Flatness requirements should be stated in the project specification.
Fiber-reinforced screed
Adding fibres to the mix improves resistance to shrinkage cracking and adds durability, which is useful for heavy-load areas. Fibres improve crack behaviour but do not replace correct design — joints, thickness and base preparation still have to be right.
Screed repair and re-screeding
Existing screed can be uneven, cracked or hollow where it has lost bond with the slab. Tapping the surface reveals hollow areas. Depending on the extent, the fix may be grinding, patching, or removing and re-laying the affected areas. Assess the cause first — otherwise the same problem returns.
Choosing by floor finish
- Ceramic and porcelain tiles in villas and apartments: sand-cement screed, levelled to the tolerance the tile adhesive needs
- Vinyl, carpet, engineered flooring and resin finishes: self-leveling screed, or a very well-finished sand-cement screed, plus a moisture check
- Warehouses, factories and large slabs: laser-guided screeding, with fibres for heavy loads
- Cracked, hollow or uneven existing floors: inspection first, then repair or re-screed
Common screed problems
- Hollow spots: usually poor bonding or a dirty, unprepared base
- Cracking: often from drying too fast in hot weather, missing joints or poor curing
- Moisture failures: floor coverings laid before the screed has dried enough
- Uneven surface: loose level control or rushed finishing
In Saudi Arabia's heat, fresh screed can lose moisture too quickly, so protection and proper curing matter. Drying time depends on thickness, mix and site conditions — ask for a moisture test before laying moisture-sensitive finishes such as timber, vinyl or resin.
Questions to ask your contractor
Which screed type is proposed and why? What thickness and mix design? How will the base be prepared, and how will the screed be cured? How is level checked, and how will moisture be tested before the floor finish goes on?
Preparing the slab before screeding
The screed is only as good as the surface it sits on. The slab needs to be clean, free of dust, oil and loose material, and any weak surface layer needs to be removed. Depending on the system, the slab may be primed or given a bonding coat so that the screed sticks properly. Skipping preparation is one of the main causes of hollow-sounding screed that later cracks and lifts.
Bonded, unbonded and floating screeds
- Bonded screed: laid directly on the slab and stuck to it, so the two act together. Common for thin layers where a good bond can be achieved.
- Unbonded screed: laid over a separating layer such as a membrane, so it moves independently of the slab. Useful where the slab is uneven or contaminated, or where movement has to be allowed for. It is usually thicker.
- Floating screed: laid over an insulation or acoustic layer, so it does not touch the slab. Used where thermal or sound insulation is needed under the floor.
The right choice depends on the base, the loads and the type of floor finish, and it should be stated in the specification.
Thickness, reinforcement and joints
Thickness depends on the screed type and the loads it must carry, and thin layers are not always better. Movement joints and saw cuts are needed to control cracking, particularly across doorways and large areas, and they should line up with joints in the tiled or stone finish above. Cracks that follow the joint lines in a new tiled floor usually mean the screed joints were missing or were not carried through into the finish.
Curing and protection in hot weather
Fresh screed dries from the surface, and in a hot, dry, windy climate it can lose water faster than it can gain strength. Covering the screed, keeping it damp for the curing period, and protecting it from direct sun and draughts helps to prevent surface cracking and dusting. Keep foot traffic and heavy loads off until the screed is ready.
Checking moisture before the floor finish goes on
Timber, vinyl, carpet and resin floors are sensitive to moisture in the base. Laying them over damp screed can lead to lifting, bubbles and adhesive failures. Ask your contractor to test moisture with a suitable meter or an approved test method, and to confirm readings against what the floor covering manufacturer requires before work begins.
What a screed quotation should include
- The area and the type of screed
- The thickness and the mix or product specification
- Preparation of the slab and any primer or bonding coat
- Joints and how they are set out
- Curing method and protection
- The level or flatness tolerance the floor must achieve
- What is excluded, such as removal of old screed or repair of the slab
A quotation that lists these points makes it far easier to compare offers and to hold the work to the specification.
When repair is enough and when to re-screed
Small hollow areas or isolated cracks can often be repaired. When large parts of the floor are hollow, badly uneven or soft, or the cause is a bad base, patching may not last and re-screeding is the better long-term decision. A proper inspection before quoting saves money on both sides.
YYM Prestige provides traditional, self-leveling, laser-guided and fiber-reinforced screed, plus repair and re-screeding, across Saudi Arabia. Contact us for a free quotation.