F_BALL_SUBFLOOR_PREP_BROCHURE-Jan-26 - Flipbook - Page 16
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Subfloor Preparation Guide | All aspects of subfloor preparation and floor covering installation
Stubborn, existing floor coverings can be removed using
a process called Multistripping whereby a blade or pick is
attached to the front of the machine, which cuts into/lifts
under the surface finish to be removed.
Typical applications are: removal of vinyl, rubber,
carpets, fully bonded wood flooring, ceramic, stone
and terrazzo tiles. Multistripping can also be used to
remove smoothing compounds, adhesives, thermoplastic
markings and scrape surface contaminants.
Always consider:
• The type of material to be removed.
• Single or multiple layers.
• The composition and thickness of the substrate.
• Weight and download applicable to the process.
• Power requirements of the machine specified.
Always consider the working environment, access
to area and risk of flying debris.
Additional methods of preparation may be required
prior to the application of the new materials specified.
If in doubt contact a surface preparation expert
for guidance.
Composition Floors
Floors constructed of magnesium oxychloride cement
(magnesite) will be adversely affected by dampness
rising from the ground if they are covered with an
impervious layer. Unless it can be established that
the composition floor is adequately protected against
rising dampness, it must be removed, and the base
made good before floor coverings are installed. If the
floor is protected against dampness, then cracks and
small hollows should be patch filled and the whole
area skimmed with a minimum 3mm of the appropriate
Stopgap smoothing compound.
Calcium Sulphate Screeds
In all cases, calcium sulphate screeds, which includes
anhydrite and Alpha hemihydrate screeds should be
sound and stable. All laitance should be removed during
the initial grinding stage, however, this is not always the
case and checks should be made prior to proceeding
with the application of any material. If laitance still
exists, this should be mechanically removed by further
grinding/sanding and the dust must be fully removed
by vacuuming – instruction should be sought from the
manufacturer of the screed. It is imperative that checks
are also made to determine the moisture content of
the floor and this is carried out using a hygrometer in
accordance with British Standards BS 5325, BS 8201
and BS 8203. A reading of less than 75% RH for textile /
resilient and less than 65% for wood must be obtained.
Where construction moisture measurement is required
using the carbide bomb method, readings of less than
0.5% must be obtained. Prime using Stopgap P121 which
should be applied in two coats, the first being diluted
with an equal part of water then allowed to dry before
a second neat coat is applied prior to the application
of Stopgap 1100 smoothing compound or suitable
Styccobond adhesive.
