DPC Injection Fluid P.O.A.S

Technical Data Sheet

1.   DESCRIPTION

Antel DPC Injection Fluid POAS is a solution of a  polyoxo aluminium stearate water repellent 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    

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

Polyoxo aluminium stearate surface water repellents for masonry are known to be effective for 10 years.  These products are applied to the surface of the wall, but a damproof course application saturates the wall in depth.  Excluding use in new repair work (where alkaline mortars are present) the process is expected to remain effective for at least 20 years.

6. ODOUR

Under normal circumstances a building with a 230 mm thick solid wall or a conventional cavity wall should be free from solvent odour two to four weeks after the application.   If the building has thicker walls, if fireplace areas have been treated, if the property has both solid and suspended timber floors (which restrict ventilation) or if the property is cold or unventilated, solvent odour may persist for a longer period.

7.   HEALTH & SAFETY

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).

8.   INSTALLATION

ACTION WITH RESPECT TO FLOORING TIMBERS

8.1 Where a suspended timber floor is independently supported on sleeper walls, with an effective damproof course, these need not be treated.

8.2 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.

8.3 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.

8.4 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

9.   PROCEDURE

9.1 The course to be injected is chosen so that the position of the horizontal damproof course complies, as far as is practicable with BS 6576:1985

9.2 Internal walls on solid floors are injected as close to the floor as possible.  

9.3 Complementary vertical damproof courses are positioned, where necessary, to isolate treated walls from the effects of rising damp in adjoining walls to maintain continuity between horizontal damproof courses at different levels.

9.4 Internal plastering affected by hygroscopic salts is removed from the area to be treated to a height of 300 mm 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.

INJECTION PROCEDURE FOR BRICKWORK - HIGH PRESSURE

9.5 Two 10 mm 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 120 mm and maximum spacing of 150 mm.  If a brick course proves too dense to allow adequate penetration of fluid, drilling may be carried out in the adjacent mortar courses

PROCEDURE FOR DIFFERENT TYPES OF WALLS

9.6

a. Walls 115 mm thick are injected from one side only.

b. Solid walls of 230 mm thick are normally injected from both sides.  If access is restricted they may be drilled progressively (using a sequence of drilling, injecting, re drilling) to deepen the hole by 100 mm to 120 mm and reinjecting.

c. Solid walls of greater thickness can be treated from one of both sides.  In each case the progressive injection technique is used.

d.   Cavity walls are normally treated from both sides, but if the thickness of the individual leaves permit, the progressive injection technique is used from one side.

9.7 The 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.

INJECTION PROCEDURE FOR MORTAR  -  LOW PRESSURE

9.8 Holes are drilled at 150 mm to 170 mm spacings and the fluid is injected at a pressure in the range of 150 kPa to 350 kPa.

INJECTION PROCEDURE FOR SOLID STONE

9.9 In solid or cavity walls of conventional construction in block work or stone the drilling and injection procedure is adjusted to accommodate variations in the density, porosity and structure, but in each case the procedure chosen ensures a continuous unbroken band of impregnated material along the length of the wall.

10.   GENERAL

10.1 Untreated walls are isolated by injection of a vertical damproof course throughout the thickness of the wall.

10.2 Treated walls are left for a period of at least 14 days to allow initial drying out.   Internal plastering is applied, using a sand/cement mix incorporating Antel Rendermix (See Replastering Specification)

10.3 Particular care is taken to avoid bridging the injected damproof course, both internally or externally.  Where external rendering has been removed, it is restored, ending in a bell casting above the injected damproof course.

10.4 Holes in the external wall surfaces are plugged with sand/cement mortar or preformed plastic plugs coloured to match the existing wall surface.

10.5 In buildings with a history of penetrating damp, a spray treatment of surface water repellent is applied to prevent recurrence.