How to apply a MORTEX coating to a wooden floor?
OSB, MDF and similar boards.
In an attempt to avoid cracks due to movement and/or expansion of the substrate, it is possible to place the MORTEX product on an OSB / MDF floor. To do this, we recommend gluing and screwing (stainless steel screws to prevent rust) two layers of OSB / MDF boards, crossing them (1st layer from left to right and 2nd layer perpendicularly), as shown below.
here flooring diagram
Next, an uncoupling membrane will be pressed into the first technical layer of MC2-N. This will provide greater stability in your floor and reduce the risk of cracks, although there is no such thing as zero risk.
It is of course the way in which these plates are placed and the quality of the work that will ensure the stability of this structure.
Of course, you can never be sure to avoid a very large movement.
A few words about CAPILASIL® water repellents
The CAPILASIL® range is a range of water repellents in aqueous and/or solvent phase.
CAPILASIL® water repellents are products based on oligomeric siloxanes in the form of very small molecules. These molecules therefore do not tend to block the pores. The most concentrated solution (10% active ingredients based on a 100% concentrate) only clogs the pores at a rate of 2%, which is perfectly negligible.
For solvent-based CAPILASIL®, always be careful not to come in contact with materials sensitive to solvents (insulation, roofing, asphalt, etc…).
CAPILASIL® in aqueous phase are to be avoided on already water-repellent surfaces, as the product is repellent to any waterproofed support.
Substrates must be dry before treatment for ideal penetration.
Spraying the product is not recommended (especially for solvent-based products). The water or organic solvents contained in these products will tend to evaporate and, consequently, will not perfectly play their role within the walls. In fact, water or solvents are the “transport” agents of the active ingredients that are essential in the substrate to allow an excellent diffusion, which will always be the basis of a perfectly successful treatment.
This is why we use heavy organic solvents (mostly aromatic ones) in solvent solutions, which, thanks to their slow evaporation, help the product to diffuse well into the support. This is an additional advantage for an efficient treatment.
Description of the basics for injection against rising damp
Two different CAPILASIL® products for injection as well as for facade protection.
1. Solvent phase :
BEAL formulates CAPILASIL® in a solvent phase based on a concentration of active ingredients composed of oligomeric siloxanes (10% concentration) by means of a high quality and high performance, de-aromatised solvent.
Aromatics are largely eliminated, but some remain.
The solvent is heavy to allow diffusion to continue after injection. Then the solvent will evaporate and give way to the barrier created by the polymerisation of the oligomeric siloxane system.
The solvent is the transport agent of the product. It is non-polar so it does not mix with water. Initially, the solvent acts as a barrier and as soon as it evaporates, polymerisation takes place to form the real barrier (the barrier is effective on the day of injection). Any moisture present in the substrate is a factor which accelerates polymerisation.
Do not use this “solvent” base if solvent-sensitive elements are present in the walls, on the floor and underneath the screed or concrete, etc. In this case, use CAPILASIL HEH2O (water-based).
Heat (in cold periods) and ventilate the treated areas to evacuate evaporated solvents and humidity still present in the walls. The last aromatics still present in the products are naturally more odorous when heated. Storage heaters will therefore significantly increase the smell of the remaining aromatics (e.g. a cold sauce when heated will release its aromatics).
The drying time depends on the components of the wall coverings (paint, plaster, lime, cement, tiles, etc.), heating (cold periods) and ventilation. It therefore depends on the inhabitant of the premises.
In general, for uncovered walls, it takes from 6 months to a year and a half, or even longer. In the early stages of construction sites open to the wind (frames not placed), there was a rapid drying out period of around 2 and a half to three months.
2. Aqueous phase:
BEAL formulates CAPILASIL® HEH20 based on siloxanes diluted in water.
The advantage of this type of product is that it is completely odourless.
On the other hand, it should be noted that the injection will bring into the substrate a significant quantity of water necessary for the diffusion of the siloxanes. This water will also have to evaporate. Drying process will therefore be much longer than with a solvent-based product whose solvent evaporates more easily. There will also be a formation of additional salts since water is added in large quantities in an alkaline medium.
The barrier is not effective on the day of injection, but much later. Siloxanes start to polymerise as the water evaporates, therefore slowly. Polymerisation usually begins after one month and more quickly in periods of high heat.
There is also the risk that in the presence of increased rising damp, the barrier will rise and be diluted before polymerisation has taken place.
The polymerised siloxanes will then be effective after all the water in the products and walls has evaporated. Drying time depends on the components of the wall coverings (paint, plaster, lime, cement, tiles, etc.), heating (cold periods) and ventilation. It therefore depends on the inhabitant of the premises.
In general, for walls that are not covered, it takes from 6 months to two years.
On sites open to the wind (unplaced frames), much faster drying out has been observed. After 10 months, convincing results were observed.
A few words on rising damp?
All humidity problems are a result of capillary action, i.e. the action of capillaries in materials, except of course for direct water ingress.
Pay special attention to the way in which rising damp is announced to you by professionals!
There are indeed several devices on the market, the most sold is a device that lets power pass between two electrodes. Water being a “good conductor”, the measurement is taken on the dial and gives a scale corresponding to the percentage of humidity contained in the walls. It should be noted that it is not only water that is a conductor, but also salts, which are very often present in masonry: phosphates, sulphates, chlorides, etc.
So, electrode devices might not be suitable for obtaining convincing results in terms of humidity content. These devices work on the basis of a power passing between two electrodes. The wetter the medium, the higher the measurement. But it can also be misled by salts in a dry wall. Salts are conductive elements.
The only approved system is the CM method (Carbide Method). This device is available at BEAL office on the basis of a prior reservation for technical explanation and a deposit.
In some cases, chloride formation can be observed in houses along the roads, which receive water with de-icing salts or in houses in coastal marine areas.
In addition, nitrates can be formed from organic decomposition (farms, old stables, etc.). Beware also of bricks and porous reused materials which may contain nitrates depending on their origin.
Treatment against rising damp in this type of building is one of the first operations to be carried out to allow the walls to dry out more quickly, as the building is open to all winds.
Crystallisation of salts is a common phenomenon and these salts have a tendency to grow in volume, causing detachment of the finish and even bursts in the materials themselves.
All salts are hygroscopic and retain water. When treatments are carried out, which are effective in the injection zone, there may still be areas of masonry above the injection barrier containing salts, particularly nitrates. In case of high concentration, these salts can cause disorders (damp stains) in very specific places and this will no longer have anything to do with rising damp problems.
The presence of these salts can also be a very influential factor in determining the actual source of humidity.
After a rising damp treatment, water remaining in the walls must still be removed by evaporation. As salts are soluble, water acts as a “carrying agent” of the salts that remain on the surface when the water evaporates.
There are other systems to overcome this problem, for example the MORTEX NO3 coating. For more information on this problem, please contact us. Manufacturing to order depending on the availability of raw materials.
Walls contain capillaries and have a surface tension specific to the materials present. The role of a good injection product is to leave a very high vapour permeability, but to prevent water from migrating through the capillaries. This barrier is achieved by changing the different surface tensions of the materials. Water will no longer rise through the capillaries and will be blocked at the point where the treatment has been carried out.
CAPILASIL® fulfils this function perfectly.
When injected in accordance with the professional standards and the installation instructions, it will give full satisfaction. The formulation is based on oligomeric siloxanes (10% of active ingredients). This means that they are very small molecules that will only block a few pores, which is a very important characteristic.
Monomer-based silanes have even smaller molecules, but they are very volatile, so in order to have a concentration of around 10% of active materials on and in the walls, a product based on 30 to 40% of silane active materials would be needed. Polymers have a nasty tendency to block the pores because they have large molecules. They therefore block the pores and capillaries, greatly impeding vapour permeability.
Important: Salts, and in particular nitrates, can form a chain that allows humidity to continue to rise after a conventional treatment.
In order to avoid this major inconvenience, we propose a treatment with CAPILASIL HS (solvent phase) when the nitrate level exceeds 3.5 – 4%.
In order to carry out this measurement, please send us by post or bring us at least 10 g of wall dust (most humid and porous areas). This wall dust being taken every 6 metres of the same wall at the level of the future injection barrier. Ask for our conditions.
We will send you the results after analysis.
It should be noted that in some cases, the walls are thought to be affected by rising damp when it is simply a matter of capillary action of the joint or a lack of material between the skirting board and the tiles. This allows then cleaning water (or accidental damage from a liquid spilt on the floor) to penetrate through the solid or hollow joint up to the plastering, causing rising damp. This phenomenon is more significant if the last tile laid against the wall slopes slightly towards the wall. As the plastering is not very porous and the skirting board is watertight, water storage becomes more and more important with each cleaning and can cause damage similar to walls affected by the same phenomenon. In this case, a simple silicone sealant such as MS polymer can solve the problem. After placing the sealant, allow the wet materials to dry thoroughly before repainting.
If you would like to know more about rising damp injection products, please visit www.capilasil.com
Who manufactures the CAPILASIL® products?
Beal is the only manufacturer of the CAPILASIL® range of products and has registered the name. We advise you to beware of imitations and counterfeits, as they do not meet the same quality requirements.
BEAL INTERNATIONAL products, and in particular the MORTEX®, BEALSTONE® and CAPILASIL® products are protected products. They meet strict quality requirements for which BEAL INTERNATIONAL is committed to guaranteeing results. BEAL INTERNATIONAL is the sole manufacturer of its products.
The products are distributed by BEAL INTERNATIONAL and its distributors (official and unofficial). The points of sale are available on www.beal.be
Many competing companies seek to use the reputation of BEAL INTERNATIONAL and its products to mislead the consumer, not hesitating to use deceptive, misleading or disparaging means to market products of much lower quality or without authorisation. Please remain vigilant with regard to any counterfeiting or imitation and, if necessary, inform the management by e-mail via the address email@example.com.
How much do CAPILASIL® products cost?