Planning a floor screed: build-up, drying and costs
The screed lies between the load-bearing structure and the final covering. It can distribute loads, adjust levels and form part of an insulated or heated floor. Use, available height and the future covering need to be planned together.
Screed, structural slab and covering are different jobs
A screed is neither the load-bearing slab nor the visible covering. A screed quote does not automatically include removing old layers, installing insulation or laying parquet and tiles.
In refurbishment, establish whether a new load-distributing layer is needed, the existing screed can be repaired or thin levelling is sufficient. Materials, preparation and schedule differ. A screed left exposed also needs construction and surface treatment suited to that use.
Which build-up suits the building?
A floating screed rests on suitable insulation and is separated from adjacent elements. A bonded screed relies on its connection to a sound supporting base. A separating layer provides another option. The choice depends on structure, loads, moisture and requirements.
Cement, calcium-sulphate and dry screed systems also differ. Flowing describes placement rather than necessarily a distinct binder. Wet exposure, exterior use and heavy loads require a compatible system. A heating-suitability statement does not replace assessment of the complete build-up.
| Option | What requires professional assessment |
|---|---|
| Floating screed | Insulation, edges, loads and uniform thickness. |
| Bonded screed | Strength, adhesion and base preparation. |
| Unbonded screed | Base, separating layer and appropriate sizing. |
| Dry screed | Level support, approved build-up, loads and compatible covering. |
Consider height, pipes and insulation together
The space up to finished-floor level must accommodate all required layers: levelling, insulation, heating, screed, adhesive and covering where applicable. State the total available height if it is restricted. This is different from the required screed thickness.
Pipes, uneven bases and different room levels may require preparation. Doors, landings and transitions should be coordinated before installation. Insulation cannot be selected by name alone: load resistance and compressibility influence the layer above.
For timber construction or older buildings, self-weight and structural capacity need assessment. Reducing thickness or changing material is not automatically a solution. Have the necessary sizing and structural measures explained.
Include underfloor heating early
Heating, pipe layout, joints and floor layers must work together. State whether heating already exists or will be installed. Planned cooling and the final covering also matter.
Coordinate heating work, pre-installation checks and subsequent heating procedures. Repairs or removal require knowledge of existing pipes. Functional heating and sufficient drying for the covering are different tasks; retain the relevant records.
Ready for foot traffic does not mean ready for flooring
A screed may allow careful walking without being suitable for parquet, vinyl or resin coating. Readiness depends on material, thickness, moisture, strength and intended covering. A dry-looking surface or a calendar date is not enough.
Temperature, air humidity and air exchange influence drying. One week per centimetre is not a dependable schedule. Rapid products have their own conditions; dry screed does not eliminate every waiting period from bonding, levelling or finishing.
Agree appropriate protection, ventilation and any heating procedure. Define who organises it, who checks readiness and when following installation can begin. Avoid unplanned changes to heating or drying conditions.
Which factors affect screed prices?
Area alone is insufficient for comparison. Material, thickness, existing layers, insulation, heating, access and site setup determine scope. Placement alone is not comparable to removal and a complete new build-up.
A purely geometric example: 50 m² multiplied by 0.06 m gives 3 m³ of screed. The assumed 6 cm is not a recommendation. Insulation, covering and uneven areas are excluded; the contractor must define actual construction and measurement.
| Cost item | What the quote should include |
|---|---|
| Existing floor and preparation | Checks, removal, disposal and levelling. |
| Floor build-up | Insulation, separation, moisture protection and edges. |
| Screed | Material, thickness, area and treatment of extra thickness. |
| Site logistics | Access, setup space, transport and connections. |
| Drying / heating | Agreed services, energy and responsibilities. |
| Handover / following work | Checks, preparation for covering, travel and VAT. |
Clarify the cause before repairing damage
Cracks, loose areas, moisture and unevenness can have different causes. Describe the visible problem and its extent. Defects should not simply be covered while movement or moisture persists.
Partial replacement needs careful transitions and knowledge of heating pipes. Consider potentially problematic substances before disturbing old coverings or adhesives. Identify outstanding checks and agree extra work before it is carried out.
A clear handover prepares the next trades
Before work, clarify access, material supply, required connections and clear areas. Mixing or pumping space and transport routes may alter the work. In occupied buildings, agree downtime and protection.
Installed material, build-up, installation date and necessary heating or assessment records help subsequent work. Coordinate levels, joints, observed damage and release for the specific covering with the firms involved.
- Planning. Coordinate use, covering, levels and interfaces.
- Preparation. Assess the base and complete required work.
- Placement and protection. Install the system and maintain the agreed conditions.
- Release. Pass checks and documentation to the next contractor.
Frequently asked questions
Do I need to choose the screed type?
No. For the initial request, describe the task, use, area, visible base and known requirements. The contractor should recommend construction and material after assessment.
How long does drying take?
System, thickness, conditions and final covering matter. Agree a realistic schedule and necessary readiness checks rather than a universal number of days.
How thick should the screed be?
There is no single value. Loads, insulation, heating and structure determine it. State known restrictions on total build-up height; the required screed thickness is professionally designed.
Can the existing screed remain?
If sufficiently suitable, repair or levelling may be enough. Damage, moisture, intended use and new covering need assessment together.
Is underfloor heating included in the quote?
Only if explicitly agreed. Heating installation, screed placement, heating procedures, drying and final covering may be separate services. Compare equivalent complete items.
