Hi-Flow Commercial

Hi-Flow Commercial

Tarmac's Hi-Flow Commercial is a free flowing, self-smoothing, protein free commercial underlayment which is obtained by mixing water with a carefully selected pre-blended formulation of high quality raw materials.

When laid at thicknesses from 3mm to 20mm Hi-Flow Commercial is suitable for use in commercial buildings where the need is for a smooth surface which can readily receive overlayment materials. 

Product Benefits

  • Smooth and level platform, perfect for vinyl, carpet, tiling and wood
  • Factory blended, tested and packaged in accordance with BS EN ISO 9001
  • Suitable for various overlayment materials incl. vinyl flooring and commercial carpeting
  • Thicknesses from 3mm to 20mm
  • Laying rates in excess of 1000m2 per day
  • Dry enough to withstand foot traffic after 2 to 4 hours (at20oC)

Typical Performance

Fresh Properties:
Pot Life: 25-30 mins (temperature dependant)
Flow Ring Values: 230-255mm
(65mm Ø,
40mm High Flow Ring)
Hardened Properties: 
Compressive and Flexural Strength N/mm² (air cured at 20℃)  EN 196 Mortar Prisms
Compressive Strength (N/mm2) Flexural Strength (N/mm2)
1 day 10 1 day 2.5
7 days 20 7 days 4.0
28 days 25 28 days 7
Controlled Expansion ASTM C490  

7 days


28 days


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