The most common problems seen on façades
This is an uncontrolled invasion of CO2 (carbon dioxide in the air) into the cement. It affects the durability of the structure which, due to the decrease in pH, ceases to be protected and may corrode. When corrosion is triggered, the useful life of the building may be seriously reduced.
Treatment: Eliminate all the defective areas, clean right down to the structure and then apply a rustproof undercoat. To repair the cement, we need to use the appropriate cement-repair mortar for each case.
Fissures and cracks
These have several causes – damp seeping through the inside of the wall, structural subsidence or lack of elasticity in the rendering, etc.
Treatment: Open the crack into a “V”, removing any parts of loose render or flaky paintwork. Reinforce the opened up crack to ensure that the filler holds well. Afterwards, apply elastic grouting especially for façades. In the event that the crack is larger than usual, other solutions should be used, such as Mallatex glass fibre mesh, or glass fibre rods, etc.
Blistering and flaking
This is caused by a lack of permeability of water vapour on some surfaces. Continuous, untreated blistering may lead to the wall flaking and spalling.
Treatment: Pressure wash (180 bar) the surface and then scrape the areas which are still loose manually (with a scraper or wire brush, etc). Once the surface is dry, an elastic render for façades is applied.
These are caused by damp and pollution. Together, or separately, they can cause the wall to spall.
Treatment: Pressure wash (180 bar) the surface and then scrape the areas which are still loose manually (with a scraper or wire brush, etc).
White stains on the paint surface, the cement or brickwork, caused by damp, which undermine the paint’s adherence to the surface.
Treatment: Detecting and neutralising the source of the humidity is essential for the restoration process to be successful. Once this has been done, we pressure wash (180 bar) the surface and then scrape the areas which are still loose manually (with a scraper or wire brush, etc). Once this is dry an elastic render for façades is applied.
Damp is their great ally. A microbiological attack multiplies the wall’s capacity to absorb moisture and therefore its effects increase.
Treatment: Pressure wash (180 bar) the surface and then treat the areas which may still be infected with disinfectants.
At Decoman we offer various finishes
There are infinite finishes we can give to a façade. We set out below the ones done by Decoman, which is a benchmark company in the sector.
Façade repair and painting
We take care of the entire façade repair, from masonry work to the complete application of the final rendering.
Each façade painting system (rendering) basically consists of undercoating, or preparation of the base, and topcoat, having pressure washed and filled any small cracks. Each system has its own features: Elasticity, colour intensity, resistance to ageing, water vapour permeability, anti-carbonation barrier and rainwater-proofing.
- Acrylic System: Organic film-forming systems. Protects reinforced concrete from carbonation and the weather.
- Polysiloxane System: This is the most waterproof on the market. It offers excellent water vapour permeability. Highly durable and elastic.
- Silicate System: Reacts to the surface and is non-film forming, highly water vapour permeable and weather resistant.
At Decoman we use very high quality rendering, giving lasting finishes for many years.
How do we do the work?
Before starting, we would like you to think about the importance of safety in the workplace and the need to employ a professional company which complies with the health and safety at work act correctly.
- Lifting machines: There are a wide variety of lifting machines on the market – telescopic, articulated and scissor lifts, etc. They allow us to reach heights of up to 40 metres and they have multi-security systems which makes them very safe machines.
- Scaffolding: We use certified European aluminium scaffolding, complying with the safety regulations and making the operators’ work easier. It is anchored to the façade walls and workers are hooked up to the structure with a safety harness at all times.
- Hanging scaffolding (Cradle): Cradles are used for work where, due to its nature, it is not possible to use a machine lift or European scaffolding. It can be used on a width of up to 12 metres and at heights of up to 100 metres.
- Vertical work: This kind of work has grown significantly over the past few years and is inspired by sport climbing. The health and safety act only allows this kind of work where it is not possible to use any of the means described above. Its use cannot be justified for solely financial reasons. How is it done? The worker hangs from ropes strapped into a special harness which allows him to be seated, so that works can be done as comfortably and safely as possible.
For these and other services of façade restoration, please contact us.