STOPGAP RED BAG is a self-smoothing underlayment suitable for use in light to medium-duty internal applications for preparing sound absorbent subfloors prior to the installation of new floorcoverings.

STOPGAP RED BAG is designed for application over concrete, sand/cement screeds and other solid absorbent surfaces.

STOPGAP RED BAG is dimensionally stable and is supplied as a pre-blended dry powder which is designed for application between 3-6mm (unfilled). It is protein-free which allows it to be used in biologically sensitive areas.

it is essential to prime all surfaces

Absorbent surfaces - Prime with dilute STOPGAP P131 to prevent rapid drying of the underlayment.

The primer should be used in accordance with instructions printed on the bottle and must be allowed to dry before applying the smoothing underlayment

General information

Uniclass 2015

Pr_35_31_06_80 Smoothing and levelling underlay compoundsPrimary


M50/45 Existing floor covering removed

M50/460 Smoothing/ levelling underlayment compound

M51/110 Carpeting

Specification data - Smoothing and levelling underlay compounds

Product Reference

Stopgap Red Bag

Product Options

Technical properties:

  • Class (to EN 13813:2002): CT-C25-F5.
  • Working time at 20°C: 15 –25 minutes.
  • Setting time at 20°C: 3 hours.
  • At 3 mm ready to receive floorcoverings: 24 hours.
  • Consumption per mm thickness: 1.75kg/m².

Compressive strength (N/mm², to EN13892-2):

  • 1 Day: >6.0
  • 7 Days: >15.0
  • 28 Days: >30.0

Flexural strength (N/mm², to EN13892-2):

  • 1 Day: >2.0
  • 7 Days: >4.0
  • 28 Days: >5.0


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