Page 81 - CFJ_Apr26

SECTOR FOCUS SUBFLOORS & SCREEDS

subfloor. Whether gouges, ridges, trowel reliable build-up.
marks, or visible joints, they all have Bostik 3070
the power to compromise the final floor A common issue with subfloors
covering and lead to inconvenient call- in older buildings is movement
backs. at floor perimeters and between
Bostik RENO C700 FEATHERING different flooring materials, which
Adam Jones discusses why FINISH is a single-component, rapid- can cause cracking and lifting of the
fl ooring renovations often require drying patching compound that smooths floor coverings. This is especially
such imperfections quickly. It can be
problematic where the floor is subject to
specialist solutions applied from a true feather edge up to temperature and humidity changes, and
3mm in one coat, or 12mm in layers, where expansion gaps have been poorly
HOW TO ACHIEVE requires no priming, and has a walk- filled in.
Bostik 3070 is a cork-based perimeter
FLAWLESS on time of just 15 minutes. This keeps sealant designed to fill expansion joints
projects moving while delivering an ideal
RENOVATIONS base for resilient and textile flooring. up to 5mm wide between ceramic,
EVERY TIME Bostik RENO P520 EASY parquet, and laminate flooring. It
seamlessly accommodates natural
The older subfloors seen in renovations
are prone to cracks and shrinkage joints, movement and helps prevent cracks
ENOVATIONS are among the which can lead to movement and noise and deformation, as well as offering
Rmost common types of flooring if not treated during the renovation. effective sound and thermal insulation
project. However, traditionally, flooring Bostik’s RENO P520 EASY solves this around window and door frames and
contractors have been expected problem in the simplest way. A solvent- partition walls.
to solely rely on standard subfloor free, two-component resin, it is specially Bostik REINFORCEMENT MESH 100
preparation when renovating buildings – designed for repairing non-structural
as if there was no difference between an cracks and filling shrinkage joints quickly
upgrade and a fresh installation. and effectively – restoring stability to
It’s an oversight that has meant the subfloor and creating a stable base
many renovations have gone less for further subfloor preparation.
smoothly and successfully than they Bostik RENO E742 STRUCTURE
could have. But with Bostik’s RENO When the cracks in the concrete or
range of subfloor repair solutions, this is sand/cement screed are more serious,
thankfully now a thing of the past. a stronger solution is required. This
Here’s a look at some key products is particularly key where movement,
from the range, and how they can help heat, or load are involved, as defects
you on your next renovation project. can transfer through the smoothing
Bostik RENO C700 FEATHERING FINISH compound and floor coverings and cause Another solution to subfloor movement
major floor failure.
Most renovations involve dealing with Bostik’s RENO E742 STRUCTURE is caused by weak junctions between
small imperfections in the existing substrates or unstable control joints
a solvent-free, two-part epoxy resin
that repairs cracks, fills joints, and is mesh. Bostik REINFORCEMENT
consolidates friable substrates. Fully MESH 100 is a fibreglass-reinforcing
compatible with underfloor heating, it mesh designed for use with all Bostik
can be used alone or with glass fibre professional flooring systems on
cementitious and calcium sulphate
mesh for wider cracks. substrates. It helps to distribute
Bostik Rapid Repair Mortar pressure evenly, reinforcing adjoining
In some cases, the subfloor will have substrates, and stabilising control joints.
larger defects, in the form of holes, Standard subfloor preparation
cracks, and damaged steps. Standard products are still required for the bulk
products can be slow to cure or difficult of the work on any flooring renovation
to apply to such areas, which, if not project. However, you will not be fully
properly addressed, can cause major prepared until you have an arsenal
issues with the finished floor. of specialist renovation products in
Specially formulated for this exact reserve, ready to tackle the inevitable
issue, Bostik Rapid Repair Mortar is an issues that come up in older buildings.
ultra-fast curing, sag-resistant patching Find out more about the RENO range
compound that can be applied at any from Bostik. 
thickness, horizontally or vertically. bostik-profloor.co.uk/products/
This makes it ideal for repairing steps, floor-repair
cracks, and uneven concrete or screed, Adam Jones is technical consultant at Bostik
for which it delivers rapid strength and a Professional Flooring

www.contractflooringjournal.co.uk 81
@CFJMagazine CFJ April 2026