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Instarmac Level IT Super Flex 30 Smoothing Underlayment

20kg Bag

£36.13 £30.11 inc. VAT

A two component system, Instarmac Level IT Super Flex 30 Smoothing Underlayment is rapid setting and drying as well as boasting a fibre reinforced formulation. Due to a high polymer content it also offers excellent flexible properties. It has been specifically designed for use over a wide variety of subfloors including steel mezzanine decks, flooring grade plywood and can also be applied over damp proof membranes. In addition, Instarmac Level IT Super Flex 30 Smoothing Underlayment can be used as a finished wear surface.



Instarmac are a multi award-winning market-leading company. A specialist in the manufacture and distribution of cement and bitumen based products to the world markets for over 40 years. Instarmac have a solid reputation based on research, development and production of innovative materials for use in urban regeneration, tiling, commercial flooring and internal finishing markets.

  • Foot traffic in as little as 30 minutes
  • Ready to receive bonded floor coverings after 1 hour
  • Use over most common subfloors including flooring grade plywood and rigid steel
  • Ready to receive resin finishes after 24 hours
  • Fork lift traffic after 24 hours
  • Use as a finished wear surface
  • UFH compatible
  • Low odour
  • Protein free

Weight  20kg Bag + 5.0L Bottle
Working time at 20°C 10 Minutes
Walk on hardness time at 20°C 30 Minutes
Ready to receive floor coverings (based on 3mm application) 1 Hour
Range Ultra Floor
Brand Instarmac

Can this be used a top underfloor heating?


Radiant Electrical Underfloor Heating Systems: Cables must be secured to a sound strong mechanically fixed cement faced backer board. It may also be used where electrical underfloor heating is used over cementitious or calcium sulphate subfloors (see calcium sulphate screed section). In all cases UltraFloor Level IT Super Flex 30 must be applied at a thickness of 5mm above the cables for resilient, textile and timber applications and a minimum of 3mm for application of stone, ceramic or porcelain products.

Warm Water Underfloor Heating Systems (UFH): Where UFH systems are incorporated, they must have been fully commissioned and brought up to their maximum temperature, and ideally switched off 48 hours before application. In the absence of other heat sources, the UFH may be set to ‘cutback’ position to achieve an air temperature of 15o C. Any expansion or movement joints must be carried through to the finished floor surface.

What are the coverage rates? 

Applied Thickness Coverage Per Unit Consumption Per 100m² Area
2mm 6.5m² 16 Units
5mm 2.6m² 39 Units
10mm 1.3m² 77 Units
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