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Blowerproof Non Shrink Gap Filling Mortar 5Kg

Blowerproof Non Shrink Gap Filling Mortar 5Kg

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Blowerproof Gap Filling Mortar is a rapid hardening, non-shrink, cementitious mortar for gap filling. Designed for use to fill gaps greater than 5mm when using Blowerproof Liquid Brush, Blowerproof Liquid Roller and Blowerproof Liquid Spray.


  • Non shrink
  • Rapid setting
  • Easy to use
  • Requires no specialist skills or tools
  • Repairs can be carried out quickly
  • Can be applied in most weather conditions
  • Supplied prepacked for immediate use

For use on gaps greater than 5mm. Approved installers of Blowerproof recommend the use of a cementitious compound to close gaps as a more robust, durable and effective substrate for the application of the liquid membrane. This also avoids toxicity issues relating to PIR foams, dealing with foam waste trimmings and possible shrinkage.


Blowerproof Gap Filling Mortar is a polymer modified mortar supplied in a 5-litre waterproof pail. Inside is 5kgs of premixed powder requiring the addition of 900ml of clean potable water.

Price is per 5Kg tub

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Mixing the Blowerproofl Gap Filling Mortar

Remove the bag of powder from the tub, use the tub as the mixing vessel

  • Add enough water to powder to give a workable mix
  • Mix by hand or use a slow speed stirrer
  • Do not mix more than can be applied within the working life of the mortar (generally 5-10 minutes depending on temperature)
  • A trowelling mortar consistency will not bleed or shrink

Application Procedure

  • The minimum application depth for Blowerproof Gap Filling Mortar is 2mm
  • The surface must be clean and structurally sound Avoid ‘feather edging’ by cutting out the repair area Damp the surface with clean water
  • Whilst the surface is damp apply the mixed Blowerproof Gap Filling Mortar
  • Apply by hand and finish with a float or trowel to achieve the required profile
  • The material will be strong enough to withstand impact after 1-2 hours
  • When applying material in extremely warm or cold temperatures, the working life and initial ‘set’ will be affected

Blowerproof Liquid Brush, Roller or Spray can be applied directly onto the cured surface ensuring a continuos unbroken airtight seal

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