Cemflow Binder Rapid can be used to create bonded, unbonded and floating screeds in internal applications where a rapid return to service or handover is required.
20 kg paper sacks.
Protect from frost and store under dry warehouse conditions at a temperature between 10°C and 30°C.
6 months if stored in unopened packaging and stored under proper conditions.
Concrete and sand/cement screeds must be sound, dry and fully cured (not subject to shrinkage) and any laitance or surface treatments must be removed by mechanical means such as grit blasting. The surface tensile strength of the substrate should be a minimum 1.5 N/mm².
Concrete substrates should be primed using Neoprene Primer. Another application procedure is by preparing a bonding latex slurry and the application of the mortar while the slurry is still wet.
If there is a concern of negative water pressure, Strongcoat DPM should be applied as a damp proof membrane which is broadcast with a quartz aggregate to form a key for the bonding slurry. The temperature of the floor must be maintained above 10°C throughout the application and drying of the DCP Screed Binder Rapid.
UNBONDED AND FLOATING SCREEDS
Walls and columns must be isolated with suitable separation joints. Substrates and insulation boards should be stable with no lateral movement possible.
When screeding over underfloor heating pipes, a minimum cover of 25mm is required above the pipes. Underflooor heating should be pressurised and commissioned following the manufacturer’s instructions.
Suitable ventilation is required however ensure doors and windows are sufficiently closed to prevent draughts during application and whilst curing.
Cemflow Binder Rapid should be mixed with clean, screeding sand to the grading in BS 8204-1. Mix to a damp earth consistency using a forced action mixer. Do not over water and do not add any additives not approved by Don Construction Products.
The recommended Sand:Binder ratio is between 3:1 to 4:1 by weight. The advised used water is in the range of 5 – 6 Liters per 20 kg bag binder.
Cemflow Binder Rapid should be placed immediately after mixing. Spread the mixed Cemfl ow Binder Rapid in the application area and thoroughly compact. Screeds thicker than 50mm must be laid in two layers (wet on wet) to ensure complete compaction.
HEALTH & SAFETY
Refer to the product Material Safety Data Sheets before using Cemflow Binder Rapid.