Wykamol Group | Masonry Biocide
Microtech Masonry Biocide is an Concentrated Biocide product which is used for the effective treatment of Dry Rot on Masonry Substrates and Brickwork. Microtech Masonry Biocide dilutes with water to make 25 Litres of Ready-to-use product.
Microtech Masonry Biocide should only be used on Masonry substrates. For an effective Dry Rot Treatment for use on Timber, see Microtech Dual Purpose or Lignum Pro Gel.
Microtech Masonry Biocide carries the HSE Approval No 7361.
Supplied in 1 Litre Containers, Concentrated Solution.
Microtech Masonry Biocide is a unique formulation containing ‘Polyphase’ (a Carbonate Fungicide) for the control of Dry Rot (Serpula Lacrymans) in walls and the removal and prevention of moulds, algae, mosses and lichens from interior / exterior surfaces.
The special properties of this unique micro emulsion system give fast action and excellent absorption rates in walls when sprayed or injected.
Approved under the Control of Pesticides Regulations 1986.
For use only by Professional Operators.
For use only as a Surface Biocide.
Dilutes to make 25 litres of Ready-to-use Product
Unique micro emulsion system.
Deep penetration in masonry.
IPBC (3-Iodo-2-Propynyl Butyl Carbamate) 2.85% w/w: A biocide that provides the maximum spectrum of biological activity against the dry rot fungus (Serpula Lacrymans).
Rectify the defects contributing to the damp conditions which caused the outbreak (e.g. repair rain water drainage systems, roof leaks, etc. Improve sub-floor ventilation, install DPC).
Expose the full extent of the outbreak, including a margin of clearance beyond the last visible signs of growth in all directions, remove all mycelium, built-in timber lintels, wall plates, bonding timbers and plugs from the affected walls and clearance areas and dispose of by burning.
N.B. If it is considered impractical to remove all timber from infected walls etc., it may be possible to protect the in-situ depending on the precise conditions prevailing etc.
In a clean plastic drum add one litre of concentrate to 24 litres of clean water (makes 25 litres of final solution; rinse container prior to disposal).
Once diluted, the Microtech Masonry Biocide solution remains stable for at least 7 days but should be agitated before use after lengthy storage. Drums of diluted material must be clearly labelled with the HSE number etc.
Before starting work ensure the following statutory precautions are observed.
Wear suitable protective clothing (coveralls) and synthetic rubber / PVC gloves plus eye protection when diluting or spraying overhead. Avoid excessive contamination of overalls and launder regularly.
Cover water storage tanks before application. Do not breathe spray mist. When using, do not eat, drink or smoke.
Do not contaminate watercourses or ground. Prevent any surface run-off from entering drains.
Dispose of waste material or container safely.
In cases of severe moss build up on surfaces, remove as much as possible by physical means or break up the surface before proceeding as below. Observe the general precautions listed above (Preparation - For Dry Rot Treatment).
Some species of lichens are resistant to treatment due to their impervious surface.
To optimize the effect of the biocide solution it is advisable to abrade the face of such growths prior to treatment (e.g. by wire brush).
Removal of all organic growth from plaster and masonry surface is an essential pre-requisite for the successful performance of decorative coatings.
For interior work, most races of mould, algae, etc. should be removed initially by normal cleaning methods, followed by an application of Microtech Masonry Biocide solution (see Application - For Treatments Prior to Painting / Mould Control).
On Walls: Walls should be treated in depth with diluted Microtech Masonry Biocide at the rate of 10 litres per m³ of brickwork masonry. 4.5” (115mm) brick walls can normally be treated by generous low pressure spray application (at 1 litre per 2m²) to both sides of the wall.
Thicker walls will need to be drilled at approximately 230mm staggered intervals over the area to be treated (12-16mm drill bit). Holes should be angles downward between 30° and 45° to facilitate filling them with the treatment solution.
When the walls are drilled from both sides, the depth of the hole should reach the centre of the wall. If the walls are drilled from one side only, the depth of the holes should extend to within approximately 50mm of the reverse face of the wall.
Such treatments should be completed by surface application to both faces of the walls, although external walls need not be sprayed from the outside. 11” (280mm) cavity walls can be treated as two separate 4.5” (115mm) walls providing sufficient access at suitable intervals to the cavity has been made to ensure proper application of the Biocide to the faces of the brickwork exposed within the cavity.
It should be ensured that the cavity is clear and where possible, ventilated.
Local conditions, wall materials and type of construction would determine any variations which may be necessary to the suggested method of treatment to ensure the correct quantity of fluid (10 litres per m³) is evenly distributed within the mass of brickwork or masonry being treated.
On Floors: Where the fungal growth has extended into the subfloor area below a timber ground floor structure, the base of the structural walls, sleeper walls and oversite of the affected area must also be treated with Microtech Masonry Biocide.
Where the growth has penetrated a concrete oversite or subsoil it should be excavated and the exposed surface treated with Microtech Masonry Biocide solution.
Note: Areas below ground level (where sources of moisture cannot be isolated) may not be suitable for treatment using the above procedures.
Following dilution (1:24 with clean water), application can be either with a low pressure pneumatic sprayer (course spray) or by a watering can with a fine rose attachment.
For small items such as headstones, etc., Microtech Masonry Biocide solution may be applied by brush provided the solution is flooded generously into inscriptions and other cavities. Always direct the spray away from the body; do not spray directly overhead.
For maximum effectiveness Microtech Masonry Biocide should be applied when surfaces are reasonably dry and when rain is not imminent. Treatment should take place in win free conditions to minimise spray drift.
Once existing organic growth has been killed by initial application (1-7 days) this should be removed by brushing or power hosing followed by a second application of Microtech Masonry Biocide.
In the case of roof treatments temporary wire netting guards should be provided over down pipes and the gutters cleared of dead moss, etc. once all the debris has been removed.
Re-treatment will be necessary at intervals to prevent growth becoming re-established. The life of treatments may be considerably shortened on:
Surfaces subject to excessive mechanical wear
Very dense substrates which do not absorb much fluid
Surfaces where dirt etc. is allowed to accumulate
Persistently damp surfaces.
Note: We do not recommend the use of this product on asbestos cement surface due to the risk of fibre release and dispersal during cleaning.
After Preparation work is complete, apply Microtech Masonry Biocide solution to the surface. On relatively non-porous surfaces such as painted plaster or ceramic tiles the application rate can be reduced and the treating solution applied by fine mist spray.
N.B. Mould etc. colonies can cause damage to underlying substrates (paint, wallpaper). Care should be taken to ensure damaged decorations are removed prior to treatments and /or new coatings being applied. As soon as the surface is dry the decorative finish can be applied.
N.B. UNPROTECTED PERSONS AND ANIMALS SHOULD BE KEPT AWAY FROM TREATED AREAS FOR 48 HOURS OR UNTIL SURFACES ARE DRY.
Ideally, any area affected by dry rot should be left exposed as long as possible after treatment to facilitate rapid drying out of the masonry / oversite.
Nevertheless, re-instatement including re-plastering can proceed without delay after the application of Microtech Masonry Biocide if required.
All replacement timbers should be treated with a Lignum Wood Preservative or Boron Wood Preservative (see Timber Treatments) and isolated from direct contact with masonry (e.g. use DPC material behind studwork for dry lining plasterboard or galvanised steel hangers to support joist ends).
In cases where damp conditions are likely to persist, timbers should be treated by industrial pre-treatment as detailed in BS 5589:1989.
If an adequate sub-floor ventilation system was a contributory factor to the Dry Rot outbreak, steps must be taken to improve the system. This can normally be achieved by inserting additional or larger air bricks, strategically placed and free from obstruction (see BRE DAS 73, 1986).
Any obstructions within the subfloor areas which would impede the cross flow movement of air must be dealt with. A satisfactory sub-floor ventilation system is one which will maintain the moisture content of the under side of the floor structure below 20%.
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