Client: Wates Retail
Role: Specialist Sub-contractor
- Sika Polymer Screed laid at 100mm
- 1100m2 ﬂoor slab
- Existing cracks to slab cut out and reinstated with Sika 52 resin
- Floor primed with two coats of Sikaﬂoor 161
- Application of 2mm of Sikaﬂoor 264 as self-leveling system
Wates Retail who were appointed by the Royal Mail to ﬁt out a new sorting ofﬁce called in the specialist ﬂooring division of Cemplas Waterprooﬁng and Concrete Repairs Ltd as issues had been identiﬁed within the ﬂoor slab which had been poured 10 months earlier.
Following an inspection by specialist contractor Cemplas, and specialist manufacturer Sika Ltd, Cemplas were appointed the task of undertaking the remedial works to over 1100m2 of the ﬂoor slab. A survey by Cemplas did not reveal any cracking in the slab movement joint conﬁrming the slab had not shrunk during the 10 months it and that no special requirements were needed.
Work began by sand blasting the ﬂoor slab and the lignite was removed by drilling and removing the contents with a Vac. Following on from the removal of the lignite, holes were ﬁlled using a mix of Sikaﬂoor 264 and quartz sand to produce a scratch coat. This was also used across the surface of the concrete to ﬁll any smaller holes after the shot blasting had taken place. Any existing cracks to the slab were cut out and reinstated with Sika 52 resin.
A scratch coat was applied by trowel to level up the substrate blended from 1-part Sikaﬂoor 264 to 1–2 parts dry clean silica/quartz sand by weight to leave a level surface, pinhole free to allow an ideal surface for over coating.
Once prepared the ﬂoor was fully primed with two coats of Sikaﬂoor 161 by using short haired rollers and left to cure for a minimum 12 hours.
When the primer had fully cured Cemplas applied 2mm of Sikaﬂoor 264 as a self-leveling system. This was ﬁlled as required using Sika 0.06-0.3mm Quartz Sand. Within 10 minutes of applying the self-leveling system Cemplas operatives thoroughly spike rolled the coating at right angles to release any trapped air and remove any remaining trowel marks to provide a smooth, level, pinhole free surface achieving a consistent material thickness.
Other specialist ﬂooring operations undertaken by Cemplas include:
- Traditional screeds (Sand Cement);
- Fast drying and specialist accelerated screeds;
- Polymer modiﬁed screeds (SBR);
- Floor levelling compounds;
- Granolithic screeds;
- Bonded, unbonded and ﬂoating screeds;
- Free-ﬂowing self-levelling screeds;
- Anhydrite free-ﬂowing self-levelling and self-compacting screeds;
- Screed strengthening for weak and porous screeds;
- Chemically resistant Screeds.