# Mapei Keraflex Extra S1

Tile adhesive · Mapei

Mapei Keraflex Extra S1 takes 1.2 kg a square metre for each mm of bed, by Mapei UK's own figure: “CONSUMPTION 1.2 kg/m² per mm of thickness”.
Source: Mapei UK, Mapei Keraflex Extra S1 technical data sheet (UK), read 12 October 2026.

## The maker's figures

| Figure | The maker's words |
|---|---|
| 1.2 kg a square metre for each mm of bed | “CONSUMPTION 1.2 kg/m² per mm of thickness” |
- The conditions the maker names: Each figure is for the notch, bed, tile or joint the maker names beside it. An uneven surface, a larger notch or buttering the backs of the tiles takes more.
- Waste: None of these figures adds anything for what is left in the bucket or spilt.

## Sizes

20 kg bag

## Where to buy it

The page has the shops' own searches for it, and any link there that is paid for is marked Ad: https://buildbatch.co.uk/products/mapei-keraflex-extra-s1/#where-to-buy. BuildBatch sells nothing and compares no prices.

## Questions

**How much does a 20 kg bag of Mapei Keraflex Extra S1 cover?** Mapei UK gives 1.2 kg a square metre for each mm of bed (“CONSUMPTION 1.2 kg/m² per mm of thickness”), so what a bag covers depends on how thick a bed you lay: divide the bag's 20 kg by 1.2 times the bed in millimetres.

**What sizes does Mapei Keraflex Extra S1 come in?** The catalogue lists 20 kg bag. A shop may not stock every size.

## Where the figures come from

- Mapei UK, Mapei Keraflex Extra S1 technical data sheet (UK) (https://cdnmedia.mapei.com/docs/librariesprovider12/products-documents/1_02807_keraflex-extra-s1-zero_en-gb_6a55603c46274974aeb0dc0c8457c2c6.pdf?sfvrsn=d125e628_0): coverage, read 12 October 2026.

Written with AI tools; not yet checked by a tradesperson. Follow the bag's own instructions.

The page: https://buildbatch.co.uk/products/mapei-keraflex-extra-s1/