Screed Additives

Screed additives are materials mixed into floor screed to modify its performance. They do not replace cement or sand. Instead, they are added to enhance strength characteristics, control cracking, and influence how the screed cures and sets once laid.

What are screed additives?

Screed additives are incorporated during mixing to enhance specific performance properties of the screed, such as resistance to cracking, workability, and durability.

Each additive type addresses specific limitations of plain sand-cement screeds, depending on drying conditions, floor thickness, and loading.

What are screeding additives used for?

Overall, screeding micro fibres:

Limit shrinkage as water evaporates
Reduce cracking caused by movement or drying stress
Improve crack resistance and durability in thin or heated floor screeds
Help the screed flow and compact properly

Types of floor screed additives

Various types of screed additives are used based on the application, including:

Screed fibres – Short strands mixed through screed to control cracking and improve durability.
Micropolypropylene fibres – Extra-fine plastic fibres commonly used instead of steel mesh in many non-structural domestic floors. They spread evenly, do not corrode, and are suitable for underfloor heating systems.
Liquid screeding admixtures – Liquids that are added to the water content of screed to improve workability, bonding, or drying behaviour, or curing time, depending on their formulation.

At Insulation Wholesale, you can purchase Screed Additives at low wholesale prices with fast delivery for most of items within 2-5 days. Competitive rates guaranteed.

FAQ

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Products in Screed Additives

In stock only

6mm Vertex Micropolypropylene Screed Fibres 9kg Box (10 x 900g bags)

6mm Vertex Micro Polypropylene Screed Fibres are sold as a box of 10 x 900g bags.

£42.29£50.75 Ex VATInc VAT Add to cart
Ronafix Universal Admixture 25L

Ronafix is a single part SBR admixture for cement mortars that enhances physical and chemical properties, allows mortars to be placed in thin sections, provides waterproofing and resistance to frost, and promotes adhesion to building surfaces.

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RonaScreed 4 Day Overlay Quick Drying Screed Additive – 18kg Bag
Powder Additive for Quick Drying Screeds.
- Rapid early strength development
- Can receive light foot traffic in 24 hours
- Rapid drying, allowing floor coverings to be laid after 4 days @ 50mm/ 3 days @ 75-100mm
- Rapid strength gain permits early access by following trades
- Compatible with underfloor heating systems
- Suitable for screed pumps
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RonaScreed FastDry Prompt Additive 20L

20L RonaScreed FastDry Prompt Additive (formerly RonaScreed 8 Day Overlay) represents a screeding additive for site batched screeds is used to quickly reduce the level of retained moisture within the screed allowing floor coverings to be laid over the screed much sooner than with conventional screeds.

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