Wykamol Group | Damp Proofing
Siliconate K is a clear, odourless concentrate of Potassium Methyl Siliconate.
Once diluted with water the liquid is introduced into predrilled holes by either transfusion or low pressure injection to form a continuous chemical damp proof course.
Siliconate K is designed to be used in accordance with BS6576:2005 for installation of chemical damp-proof courses.
Siliconate K is supported by BBA Certification Certificate No: 02/3961.
Effective for at least 20 Years
Concentrated Solution - Easy Storage and Transportation
Low Hazard and Environmentally Safe
Can be used in all types of Masonry
Siliconate K a concentrated solution and should be diluted at a rate of 1:6 parts water.
A 3.6 Litre bottle makes 25 Litres of diluted, ready-to-use solution.
Check and overhaul rainwater goods to ensure they are clean and in good working order. Repair or install drains to carry away surface water.
If internal floors are below external ground level, form trenches along the external face of the walls to at least 150 mm below the proposed DPC level (where foundation depths allow). If this approach is not feasible the DPC must be placed at 150 mm above external ground level and the internal walls tanked below the DPC to prevent lateral migration of moisture/ salts..
Remove skirtings, fixings and render/plaster to expose the line of the proposed DPC (mortar bed).
Internal plaster affected by hydroscopic salts must be removed from the area to be treated, to a height of 300mm above the maximum level of rising damp.
Check flooring timbers for signs of fungal decay and repair/ replacement as appropriate.
Ensure wall cavities are cleared of debris.
Walls vary in thickness and type of construction so it is essential these factors are taken into account before deciding on an appropriate drilling pattern.
DPC height should always be at least 150 mm above external ground level. In the case of solid floors, insert the DPC as close to floor level as possible.
Vertical DPC's should be provided to connect horizontal DPC's where ground levels change and to isolate untreated wall areas (adjoining properties, garden walls etc.). In most cases solid brick walls may be drilled and injected from one side only.
For cavity walls each leaf may be dealt with as a separate 115 mm thick wall (see coverage rates below).
Alternatively, if preferred, drill through the selected mortar course, across the cavity, then drill the outer leaf of brickwork to a depth of 100 mm and inject in one continuous process. Always ensure that the cavity is clear of debris before treatment.
In random stone and rubble filled walls, as far as practically possible, follow the mortar course at the appropriate level. However, if the stone is of a porous type (mortar/stone), it may be possible to vary the drilling locations as long as the mortar bed perpends are treated. In walls of a thickness greater than 350 mm, it is recommended that drilling is undertaken from both sides at a corresponding height.
In the case of drill holes becoming blocked, these should be re-drilled just prior to injection or a new hole should be drilled nearby to ensure that an adequate volume of Siliconate K is introduced.
Drill holes, 10 mm to 16 mm in diameter, in to the mortar bed at intervals between 150mm and 170mm. The hole depths required for various wall thicknesses are shown in the table below.
For walls of intermediate thickness the depth of holes should be pro rata. Where the masonry is irregular, ensure the horizontal drilling pattern targets the base of all perpends of the course selected.
Where possible, thicker walls (230 mm or more) should be treated from both sides, or if access is restricted, injection can be carried out from one side by sequential drilling (75mm, 190mm etc.).
Drill hole depth required, dependent on wall thickness:
Insert injection nozzle with an expanding rubber sealing washer into the full depth of the pre-drilled hole.
Fill each hole fully with Siliconate K at a pressure of 300kPa. In saturated walls, lower pressures (c. 100kPa) delivered over longer periods of time are likely to be more successful.
When using a gravity feed technique (transfusion), extra care must be taken to ensure the recommended dose levels are achieved.
Spilt material should be wiped up immediately and the wipes disposed of appropriately. Contaminated surfaces should be washed immediately with warm soapy water.
If Siliconate K penetrates non-target surfaces (e.g. a patio slab) it will normally dry clear to finish. However, if staining arises consult our Technical Department for further advice.
This will vary according to the nature and porosity of the substrate. A general guide for 9” (230mm) brickwork would be 3 litres of diluted product per linear metre run.
In other words, a 3.6L Container (once diluted to 25L) will cover around 7 - 10 linear metres based on a standard 9" thick brick, depending on porosity of substrate.
On external faces of walls, drill holes can be re-pointed using a matched mortar or can be plugged with DPC Injection Plugs (Available in a variety of colours, suitable for 10mm - 12mm wide Drill Holes).
Final cure takes 2 - 6 weeks depending on the thickness of the wall.
The removal and replacement of internal salt contaminated plaster is an important part of an effective damp-proof course. Salts left behind by rising damp are hygroscopic and can cause future staining independent of any issues with structural dampness.
It is therefore essential to follow specific re-plastering guidelines drawn up for dealing with the particular challenges posed by damp / salt-affected surfaces.
It is advisable to leave walls injected with Siliconate K to dry for as long as possible, and for at least 15 days, before removing excess salts and commencing replastering.
It should be noted that whilst insertion of a chemical DPC inhibits further moisture from rising up into the wall, the moisture present before the DPC will take time to dry out.
A damp wall takes time to dry out. As a general guide, the drying rate is given as 1 month for every 25mm of wall thickness (BRE Digest 163, ‘Drying out buildings’). Thus 230mm will take approximately 9 months to dry. However, the drying processes depend on conditions, ventilation and the type of masonry, so drying may take considerably longer.
Due to the potential prolonged drying of the wall, the following must be considered:
Delay any decoration for 4-6 weeks following re-plastering and allow for good natural ventilation to enhance drying. Do not apply heat or accelerated drying methods.
Do not use wallpaper for at least 12 months (longer on thick walls).
Redecorate using a non vinyl based emulsion.
Maintain good ventilation around walls.
Note: The initial decorations should be regarded as temporary, the final decorations not taking place for at least 12 months after completion of the damp proofing and ancillary work.
We've added to your cart