Screed types · checked 29 October 2026
Polymer-modified screed
Thin, bonded screeds and repairs where the floor height is tight.
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Figures checked against each source on 29 October 2026. How we check
A polymer-modified screed is a cement screed with a polymer added to the mix. Kilsaran describes its polymer-modified screed as having improved bonding and flexibility, for floor levelling and repairs.
BS 8204-3 covers polymer-modified cementitious levelling and wearing screeds. McMahons lists Kilsaran's polymer-modified FLS410 at €12.57 per 25 kg bag.
Where it's used
- Thin bonded screeds where the floor height is tight and a 65 mm floating screed won't fit.
- Repairs to damaged or uneven screeds. Kilsaran describes FLS410 as suitable for internal floor levelling and repairs, with improved bonding and flexibility.
- Outdoors: Flowcrete notes most screeds are for internal use, but polymer-modified screeds can be used externally.
- Wearing screeds that serve as the floor surface. BS 8204-3 covers both levelling and wearing screeds.
Sources: Mineral Products Association, Mortar Data Sheet 22: Screeds (Issue 3, October 2023); McMahons: Kilsaran KPRO Floor FLS410 Polymer Modified S&C Screed 25 kg; Flowcrete, Concrete vs floor screeds (12 June 2023). Checked 29 October 2026.
The bond is everything
A bonded screed only works if it grips the slab. The Mineral Products Association says the hardened base concrete must be prepared by mechanical methods to maximise the bond. A bonded screed has the lowest risk of cracking, curling and hollowness of the three constructions.
Source: Mineral Products Association, Mortar Data Sheet 22: Screeds (Issue 3, October 2023). Checked 29 October 2026.
Drying
Ronacrete says its Ronafix polymer screeds take about 10 days to reach 75% RH at 50 mm, and a 15 mm layer typically dries in 3 days, at 20°C and 60–65% air humidity. Thin layers dry fastest.
Source: Ronacrete, Drying of Screeds. Checked 29 October 2026.
Bag prices
| Product (McMahons) | Price per 25 kg | VAT |
|---|---|---|
| Kilsaran KPRO Floor FLS410 polymer-modified sand and cement screed | €12.57 | Not stated |
| Kilsaran KPRO Floor FLS 401 sand and cement screed | €11.90 | Ex VAT (€14.64 incl.) |
Sources: McMahons: Kilsaran KPRO Floor FLS410 Polymer Modified S&C Screed 25 kg; McMahons: Kilsaran KPRO Floor FLS 401 S&C Screed 25 kg. Checked 29 October 2026. Both shown as reduced prices on the day.
Questions people ask
What is polymer-modified screed?
A cement screed with a polymer in the mix for better bond and flexibility. BS 8204-3 covers polymer-modified levelling and wearing screeds.
How thin can a polymer-modified screed be?
It depends on the product. Ronacrete quotes drying for a 15 mm Ronafix layer, and the MPA's minimum for a standard bonded sand and cement screed is 25 mm.
Can polymer screed be used outside?
Flowcrete notes that polymer-modified screeds can be used externally, while most screeds are for internal use.
How much is a bag of polymer-modified screed?
McMahons lists Kilsaran FLS410 at €12.57 per 25 kg (VAT not stated), checked 29 October 2026.
Sources (5)
Prices and facts on this page were checked against these published pages. We are not connected to these businesses.
- Mineral Products Association, Mortar Data Sheet 22: Screeds: mortar.org.uk
- McMahons: Kilsaran KPRO Floor FLS410 Polymer Modified S&C Screed 25 kg: mcmahons.ie
- Flowcrete, Concrete vs floor screeds: flowcrete.eu
- Ronacrete, Drying of Screeds: ronacrete.co.uk
- McMahons: Kilsaran KPRO Floor FLS 401 S&C Screed 25 kg: mcmahons.ie
Get your floor priced
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