Screed
A screed is a thin leveling layer of cement-based material laid over a slab or insulation to give a flat finished floor surface.
A screed is a thin leveling layer of cement-based material laid over a slab or insulation to give a flat finished floor surface.
Definition
A screed is a layer of sand and cement, or a proprietary mix, spread and leveled over a structural slab or insulation to make a smooth base for flooring.
A plain example
Illustrative example only: insulation boards are laid over a slab, covered with a separating membrane, and a screed is placed to a stated thickness and leveled to tolerance.
Why it matters
Flatness and drying time decide when tile or wood can be laid. Installing flooring on a damp screed is a common cause of failures.
Common confusion
A screed is not the structural slab. The slab carries load; the screed only levels it.
On a project
Confirm thickness, mix, reinforcement if any, curing period and moisture test requirement with the specification and the flooring maker.
Quick answers
- How long must a screed dry? It depends on the mix and thickness; test moisture rather than relying on a rule.
- Can it carry underfloor heating? Yes if designed for it; follow the system maker's instructions.
- Is it a structural element? No, it is a finishing layer.
Related terms
Always check the project drawings and specification, and confirm requirements with the engineer of record and the local authority.
Questions people ask
How long must a screed dry?
It depends on the mix and thickness; test moisture rather than relying on a rule.
Can it carry underfloor heating?
Yes if designed for it; follow the system maker's instructions.
Is it a structural element?
No, it is a finishing layer.
Sources and further reading
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