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Rising damp is a problem that can affect any type of building and causes problems for both interior and exterior areas of the ground floor. There are three main reasons that rising damp occurs – that there is no damp proof course (DPC), that the DPC is ineffective or faulty often due to age or because the ground water level is high and is bridging the DPC.
What are the signs of rising damp?
There are a number of signs of rising damp that means homeowners can easily spot that there may be a problem. Signs include:
Stain or tide marks that are up to 1 metre above the ground level on walls
Mould on walls and even on furniture touching those walls
Flaking and peeling wallpaper
Signs of decay on skirting boards
Floorboards that are rotting
Wallpaper lifting away from the walls
Bubbling and cracking plaster
Walls that feel damp when you touch them
You might notice one or more of these signs if you have rising damp in your property. You might also notice damp marks over the 1.5-metre area or mould growing around window frames – these might also indicate problems with condensation or penetrating damp. Whatever the signs you are seeing, Tapco HomeDry can come to your home to carry out an assessment and provide a solution that removes the problem.
Testing for rising damp
The first part of our testing for rising damp will involve taking moisture readings from the base of the walls as this tells us if dampness is present. There are lots of different devices that can be used including electrical resistance meters that indicate where moisture is present. We also record a profile of the resistance readings alongside thorough visual observations to decide the nature of the problem and what course of action is required.
How to fix rising damp problems
Once we have established that there is damp in the property, we can look for the reason behind this. This might involve things like loose tiles on the roof or defective flashings, poor gutters or downpipes, cracks in the render on the property or even defective pointing and damaged brickwork.
Tapco HomeDry are experts in dealing with damp related problems and can offer our professional advice after we have carried out a survey. The survey highlights the severity of the problem and how urgent the treatment is required. We can then go through damp proof treatments, costs and options with you so you can make an informed decision going forward.
DryWall and Silane Diffusion
Once rising damp is isolated as the cause of the problem, Tapco HomeDry can use a number of damp proofing technologies to solve the issue. One of these is called the DryWall and Silane Diffusion system that involves introducing a concentrated formulate of silane ‘cream’ into the wall to form a barrier preventing damp from rising.
Because the method doesn’t involve a liquid, the wall dries much quicker and the cream diffuses with the moisture in the wall. It also releases silane vapour which reacts with silica present in masonry to create a water-repellent resin. The fluid is non-flammable and has no smell, is non-caustic and solvent free.
This solution can be used on any type and thickness of wall including brick and stone construction, for both internal and external walls. It can even be used for 280mm cavity brick walls and because there is no pressure involved in injecting the cream, party walls are not an issue.
There are usually two steps required before a damp proof course can be installed – the insertion of the new DPC and the replastering of the walls. Replastering is important because it prevents salt migration and a special type of salt-retardant plaster is used. Common faults leading to damp problems can include using the wrong plaster and taking down plaster added over a DPC. New plaster needs to be significantly higher than any signs of salt or damp to work properly.
Request a Survey
If you have issues with damp, get in touch to seek advice, by calling us free, or request a survey by using our online form.
Tapco HomeDry is one of London and the Home Counties most established and reputable damp-proofing, wood-rot and property preservation companies. We are long term members of the Property Care Association (PCA), Trust Mark (Government Endorsed Standards), the Guarantee Protection Insurance (GPI), and an accredited Which? Trusted trader, providing thorough, professional surveys for both commercial and domestic properties. For pre-purchase surveys we are the all-inclusive property preservation experts, providing solutions for damp, from the roof to the drains.