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Antel
Silicone D P C Injection Fluid is a solution of a silicone resin in white
spirit. The solution is manufactured
by a controlled batch blending process.
Regular quality control checks are carried out on the final product to
maintain the highest quality damproofing fluid. 2.
USES The
process involves the saturation of a selected course of brickwork, or an
equivalent area of block work or stone, with this fluid, by pressure
injection and the subsequent replastering. Please refer to Antel Rendermix
and Replastering Specification. 3. PACKAGING 25
litre plastic containers. 4.
STORAGE/USAGE 4.5
litres of fluid are normally used for the treatment of rubble core in 1 metre
of a 450mm wall (increase pro rata for walls of greater thickness) Store
in cool dry conditions in original containers. Protect from freezing. Keep out of reach of children. The solution is flammable with a
flashpoint of 38°C to 39°C. Keep away from naked flames. 5.
DURABILITY Evidence
exists that silicones used to waterproof walls against rain penetration are
still effective after 12 years. In such
situations the silicone is applied to the surface of the wall, but a damproof course application saturates the wall in
depth. Provided there is no unusual
ground water or other contaminant and provided there are no highly alkaline
mortars present (as in new repair work) it is envisaged that the process will
remain effective as a rising damp barrier for a period in excess of 20 years. 6.
HEALTH & SAFETY The
silicone solution gives off flammable vapour and it is therefore essential to
ensure that no open fires are lit or other naked flames are present during
and up to two days after injection.
Full ventilation must be provided during this time to avoid the
accumulation of pockets of flammable vapour. Precautions
are necessary in handling and injection, to avoid bodily contact due to
splashing, spillage or leakage. The
normal precautions (use of goggles/visor, gloves, protective clothing and the
prompt removal of contaminated clothing) should be observed with particular
rigour. Should the fluid come into contact with the skin it must be washed
off promptly. |
If it
comes into contact with the eyes they should be flushed with cold water for
ten minutes and medical attention should be sought. If ingested seek medical
attention immediately. To
protect third parties from contact with the fluid, the working area must be
tightly screened off during treatment from the public highway (e.g. terraced
houses abutting the pavement). 7.
INSTALLATION 7.1 Installation is carried out in accordance with the
manufacturers instruction. 7.2 The course to be injected is chosen so that the
position of the horizontal damproof course
complies, as far as is practicable with BS Code of Practice 102:1973
(Protection of buildings against water from the ground) The damproof course must be at least 150mm above ground level
and in the case of suspended timber floors must be positioned below the
timber joists and/or wall plate. Internal
walls on solid floors are injected as close to the floor as possible.
Complementary vertical damproof courses are
positioned, where necessary, to isolate treated walls from the effects of
rising damp in adjoining walls as, for example, in semidetached or terraced
properties or where they are abutting garden walls. 7.3 Internal plastering affected by hygroscopic salts
is removed from the area to be treated to a height of 300mm above the maximum
level of the rising damp. Internal
skirting, flooring etc are also removed, as necessary, to expose the area for
treatment. Externally, the proposed damproof course line is exposed by removing any facing
material. 7.4 In brickwork 10mm or 13mm holes are drilled to
predetermined depths along the selected course. Two holes are drilled in each stretcher and
one in each header at an average spacing of approximately 120mm and maximum
spacing of 150mm. If a brick course
proves too dense to allow adequate penetration of fluid, drilling may be
carried out in the two related horizontal and connecting vertical mortar
courses, the holes not being more than 76 mm apart. Walls 115 mm thick are
injected from one side only. Solid walls of greater thickness are normally
injected from both sides, but if access is restricted, can be drilled and
injected from one side by a series of injections at increasing depths at
increments of not more than 100 - 120mm.
Cavity walls are normally treated from both sides, but if the
thickness of the individual leaves permits it, injection may be carried out
from one side, at increasing depths. 7.5 In solid or cavity walls of conventional
construction in block work or stone, the drilling and injection procedure is
adjusted to accommodate variations in density, porosity and structure, but in
each case the procedure chosen ensures a continuity of treatment. 7.6 The silicone solution is injected at normal
pressure of 700 kPa. Nozzles fitted with pressure tight seals
are inserted into the drilled holes and injection is continued until complete
saturation is achieved and the fluid begins to exude from the substrate. The nozzles are removed and subsequent
holes are similarly injected. |
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7.7 In flint walls, holes are drilled into the mortar
joint, either horizontally or at an angle, to the mid point of the wall, at
75mm intervals. Injection is carried
out at 400 kPa until complete saturation is
achieved, and visible on both faces of the wall. 7.8 In stone walls with a rubble filled cavity, the two
skins are first injected using techniques appropriate to the substrate. In walls 450mm thick, the holes in one leaf
are redrilled to the centre of the wall (into the
rubble infill) and injected singly until fluid exudes from mortar joints
below the injection level. 7.9 Walls of greater thickness are drilled and injected
the same way from both sides, for example 600mm walls are drilled to a depth
of 200mm and each hole is injected singly until fluid exudes from the mortar
joints below the injection level. 7.10 4.5 litres of fluid are normally used for the treatment
of the rubble core in 1 metre of a 450mm wall. 7.11 In walls of rubble filled construction, untreated
walls are isolated by the injection of a vertical damproof
course throughout the thickness of the wall. 7.12 The treated walls are left for a period of at least
14 days to allow initial drying out.
Internal plastering is applied as outlined in Antel Replastering Specification. Particular care is taken to avoid bridging
the injected damproof course, both internally and
externally. Where external rendering
has been removed, it is restored, ending in a bell casting above the injected
damproof course.
Holes in the external wall surfaces are plugged with sand/cement
mortar or preformed plastic plugs coloured to match the existing wall
surface. In
buildings with a history of penetrating damp, a spray treatment of Antel
Silicone Water Repellent is applied to prevent recurrence and possible build
up of water above the damproof course. 8. GENERAL The
Antel injected damproof course system is
satisfactory for use to provide a barrier against rising damp in existing
solid walls up to 600mm thick.
Existing walls of conventional cavity construction and existing walls
of rubble filled construction where there is no damproof
course or where an existing damproof course has
failed. 9. ACTION WITH RESPECT TO FLOORING TIMBERS 9.1 Where a suspended timber floor is independently
supported on sleeper walls, with an effective damproof
course, these need not be treated. 9.2 Where a suspended timber floor is supported on joists
and/or a wall plate bearing on or embedded in the wall, there is a
possibility of decay, particularly where concealed timbers are in contact
with the wall. The condition of these
timbers should be ascertained and remedial action taken if necessary. 9.3 If damage is limited to the joist ends, the floors
may be reformed using sleeper walls or joist hangers to isolate the timbers
from the damp wall. 9.4 If the timbers are sound, the existing floor may be
retained, provided the injected damproof course is
formed below the timber joists and/or wall plates 10.
DRYING OUT OF WALLS A 230
mm solid brick wall affected by rising damp and treated will normally dry out
in 6 - 12 months provided normal heating is used during the winter
months. This period may be exceeded
for walls of greater thickness. Where
hygroscopic salts are present adequate drying may not occur, but the replastering system will prevent damage to internal
decorations. |
11. POINT OF CAUTION The
injection fluid can dissolve expanded polystyrene and so the injection into
cavity walls containing this form of insulation should not be attempted. However expanded polystyrene insulation may
be used after the injection and cure of the fluid in the cavity wall. 12. RUBBLE FILLED CAVITY CONSTRUCTION By its
nature the structure and the composition of the rubble infill is
variable. Consequently it is
impossible to achieve an effective treatment with certainty. Incidence of failure is however small. Rectification by re-treatment of the
affected areas (using an increased volume of fluid) is often achieved. |
Antel Ltd, 3.5 Central
Point,