Bostik Flowfill Grout GP is a general purpose, non-shrink, (Class A) cementitious construction grout ideal for most void filling grouting jobs.
Smart Advantages Ready to use, pre mixed, requires only the addition of waterCan be pumped, trowelled, rammed or flowed to areas where normal grouting methods do not sufficeCan be mixed for stiff, plastic, flowable or fluid application

About Flowfill Grout GP

Pre-hardening volume-adjusting. Controlled gaseous expansion system compensates for shrinkage and settlement before hardening occurs

Ready to use, pre mixed, requires only the addition of water

Can be pumped, trowelled, rammed or flowed to areas where normal grouting methods do not suffice

Can be mixed for stiff, plastic, flowable or fluid application

No metallic iron content to cause staining

Lower water/cement ratio reduces drying shrinkage, increases durability and reduces permeability

Recommended Uses

All general purpose grouting

Precast and pre stressed panels

Grouting in column bases

Filling core holes, rod holes and defects in concrete

Filling for hollow block walls

Caulking of joints and pipes

Read and understand the Safety Data Sheet before using this product. SDS can be acquired by visiting or by scanning the relevant QR code on pack.The substrate surface must be clean, sound and free from oil, grease, curing compound or any loose materials. It must be mechanically abraded back to a sound concrete surface. Bolts or anchor holes must be clean and free from dust or loose material. This can be achieved by blowing clean the hole. Base plates must be cleared of all rust, oil or grease. It is essential to provide air pressure relief holes for venting. Pre-Soaking It is essential to pre-soak the concrete substrate prior to application of Bostik Flowfill Grout GP. Pre-soak substrate with water for a minimum of 6 hours prior to grouting. Immediately before pouring, the excess water should be removed. In the case of bolt/anchor holes, the holes must be blown out to ensure no traces of free water are present whilst grouting. Formwork Formwork must be constructed to facilitate rapid and continuous filling, whilst remaining leak proof and water tight. Foam rubber strips or suitable sealants underneath the formwork are recommended. Unrestrained Surface As Bostik Flowfill Grout GP is an expanding grout, it is advisable not to have any unrestrained areas. Low Temperature Working At temperatures below 5°C the cure rate and strength development rate will be dramatically reduced. If early strength is required, it is advisable to use heated water and condition Bostik Flowfill Grout GP to 25°C. Do not exceed this temperature. High Temperature Working At temperatures above 30ºC, it is advisable to use water below 20ºC when mixing grout. All materials must be kept cool and away from direct sunlight. If practical, the installation area should be shaded by erecting shade