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Rising damp can be caused by a number of defects that are nothing to do with the breakdown of the installed damp course. It is important to understand the underlying problem, rather than be misled by the physical manifestation of the damp. This is why it is essential to employ the services of a specialist surveyor to provide full rising damp survey and expert treatment.
The term rising damp describes the process whereby ground water (moisture) is drawn upwards through the mortar and masonry of a building by means of capillary action. Porous building materials such as bricks and sandstone are most likely to be affected.
All building materials have complex pore structures, the smaller the pores the higher the water can rise. This moisture often brings with it, groundwater salts and other contaminants that contaminate building materials and decorations. This means that signs of rising damp are evident to a height of about 1metre (3.3 feet) in an average property.
In most cases rising damp is a slow process and may be present in a building for several years before any signs of a problem appear. The speed at which the moisture rises up the walls will depend on several factors including:
Rising Damp can be caused by the lack, breakdown or bridging of a physical damp course, or the absence or damage of a damp proof membrane. Without these, water rises up the wall of a building in the same way that oil rises up through the wick of a lamp.
Rising Damp Technical Information »
Modern buildings in the UK include a damp proof course that acts as a barrier to water penetration. However, if some damage has occurred to the fabric of the building such as broken roof tiles, blocked air vents, leaking pipes or blocked drains; damp may then become a problem.
Performing checks and carrying out regular maintenance to your property can stop rising damp becoming an issue. We recommend these regular checks:
Our rising damp treatments are covered by a 30-year guarantee which can be passed on to future owners of the property.
Rising Damp Survey - Through experience and knowledge of damp, a Rentokil surveyor will carry out the most appropriate rising damp treatment for your property, which will include the installation of a damp proof course (DPC).
Installation of Damp Proofing - Dependant on the thickness of walls, holes are drilled in the mortar/brick of external and internal walls to a pre-determined depth and at the correct level and spacing between holes. These holes are then injected with a low odour water based silicone damp proofing fluid (damp proof course) to reduce the movement of water through the capillaries.
Damp Proofing Rod - Rentokil's damp proofing rod system is a high strength, liquid free, alternative to regular rising damp treatment methods. These damp proofing rods are inserted into holes in the masonry without the need for an injection pump. As large amounts of fluid are not added to an already wet wall, the time it takes for the wall to dry is substantially reduced. This then allows quicker re-plastering and re-decoration. Also there is no risk of fluid spillage's which reduces the risk of damage to carpets or flooring.
Re-plastering - Once our team has completed treating your home for rising damp our technician will ensure any treated walls are re-plastered. Re-plastering includes:
Providing all of our customers with the highest quality of service is our highest priority here at Rentokil, this is why ensure all our surveyors are Certificated Surveyors in Remedial Treatment (CSRT) and our technicians are trained to exceed Property Care Association (PCA) standards.
Our team will assess and correctly diagnose the extent of the rising damp issue that is affecting your property. From this, we provide recommendations on specific damp proof treatments for the most effective ways to treat the damp problem in your property.