F_BALL_SUBFLOOR_PREP_BROCHURE-Jan-26 - Flipbook - Page 19
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Wood mosaic panels require over pinning with flooring
grade plywood in all cases. This is not practical on solid
floors and panels should therefore be removed, along
with any adhesive residues.
If panels laid over a flexing timber floor need patch
filling, Stopgap 1200 or Stopgap 1500 floor smoothing
compound should be used. In all other respects wood
mosaic panels should be treated as for wood block.
Floating chipboard must be overlaid with 6 mm
plywood, but screw-fixed chipboard can be primed with
Stopgap Fill and Prime, then smoothed with Stopgap
700, in the following circumstances.
• The chipboard must be a minimum 18 mm flooring
grade (P4 to P7).
• The chipboard must have glued tongue-andgroove joints.
• The chipboard must be uncoated. If it has a
waterproof coating, it will also need to be overlaid
with 6 mm plywood.
Plywood must always be overlaid with Stopgap 700
prior to the installation of a resilient floor covering
or feathered with Stopgap Micro Rapid in lighter duty
areas. Some textile floor coverings can be directly
applied to chipboard.
Stopgap Fill and Prime should be used where the
base is either: Chipboard P5 or OSB (grade 3) providing
it’s mechanically screw fixed and glued at the joints.
After the Stopgap Fill and Prime has been applied –
Stopgap 1200, Stopgap 1500 or Stopgap 700 can be
used, therefore omitting the requirement of plywood.
MDF should conform to BS EN 622-5
Where MDF panels are used they should always
be overlaid with plywood as described above.
Raised Access Modular Floors
These are designed to give ready access to underfloor
services. All modular units must be structurally sound,
level, smooth and free from contaminants. New floors
should be degreased using Styccoclean C140 and
allowed to dry before applying the adhesive. Backed
carpet tiles secured with a tackifier such as Styccobond
F41 are suitable for this type of base.
It may be suitable to overlay the panels with plywood
as described in the previous section or as an alternative
panels that are clean and dry that have been screw
fixed to the pedestals and primed with Stopgap P131
primer may receive a minimum thickness of 3mm of
Stopgap 700 or Stopgap 1200 or Stopgap 1500.
As an easier, quicker, and thinner option, the area
could instead be primed with Stopgap Fill and Prime
and smoothed with either Stopgap 700, Stopgap 1200
or Stopgap 1500. Stopgap Fill and Prime is a two
component, flexible cement primer that is flexible
with thixotropic properties to allow the filling of joints.
Stopgap Fill and Prime should be applied using a steel
trowel and spread evenly on to the prepared substrate
providing a smooth, uniform surface. The consistency
has been designed so that joints in raised access panels
are filled. However, for application over wide joints it
is advisable to mix a unit with reduced liquid content
and fill the joints prior to a subsequent coating of
Stopgap Fill and Prime mixed to standard consistency.
Then apply Stopgap 700 or Stopgap 1200 or
Stopgap 1500.
Please note that where this process has been carried out
there is no longer any access to the panels underneath.
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