How do we treat rising damp?
How should rising damp be treated?
All too often, the damp is not taken seriously and the symptoms are merely brushed over with paint or one of the many “WATERPROOFING” plasters on the market. These brush on “SOLUTIONS” may appear to work in the short term, however it should be remembered that they only treat some of the more minor symptoms of damp. Unless the rising damp itself is cured by the installation of a new DPC, it will keep spreading and its symptoms will keep on re-appearing. Only by installing a new DPC will you finally rid yourself of the time and expense of repeatedly treating, “The symptoms of rising damp”.
VERNON KITLEY recommends the use of the chemical injection system to install a new DPC. Other than the costly and risky process of re-installing a physical DPC, chemical injections are the only method of DPC re-instatement that has stood the test of time. In Europe, chemical injection is by far the most common method used to treat rising damp. It has been used since the 1950’s to successfully treat rising damp in millions of homes. The system has been used in South Africa since the early 1970’s.
Solution to the problem paint
The complete exterior wall surfaces and parapets need to be hydro-blasted with a specialized rotation hydro nozzle. It is of the utmost importance for the walls to be prepared in this manner, as the application of the coating WILL FAIL if it is not done correctly.
The hydro blaster finds all the problem paint and contaminated plaster on the exterior wall surfaces and removes that paint and plaster. MOST IMPORTANTLY, IS THE FACT THAT THE SPECIALIZED HYDRO-NOZZEL REMOVES THE TOP FEW MICRONS OF PAINT THAT HAVE BEEN EXPOSED TO THE ULTRA-VIOLET RAYS OF THE SUN.
Solution to the damp problem
Stripping off damaged plaster and twice drilling each brick in a line at floor or ground level cure RISING DAMP. Microsilan is then injected to form an artificial damp proof course. The plaster is replaced with a waterproofed plaster. Below the damp proof course level, the wall can be excavated to foundation level and tanked with a waterproof plaster in certain cases. Specialized drainage systems should be installed around the home wall surfaces in extreme cases.
- Strip old plaster 1 meter high or 400mm high above highest point of damp damage.
- Drill two 10mm diameter holes in each brick in a continuous line just above ground or paving level, or in the first course above floor level, depending on the circumstances.
- For single walls ¾ way through each brick, in double walls through the first brick and ¾ of the way into the inner brick.
- Or ¾ into the outside brick from the outside, and ¾ into the inner brick if it is a cavity wall.
- A selected dampproofing chemical is then injected into the holes with a specialized high-pressure injection machine.
- Each brick is injected.
- The holes are then plugged with a waterproof plaster.
- The wall is then replastered where stripped with a heat generating waterproofing additive in the plaster, which speeds up the drying and waterproofs the walls.
- After the wall has completely dried out it can be painted.
LATERAL DAMP is water penetration through walls because of the absence or perforation of a vertical Damp Proof Membrane (D.P.M.) barrier, use of water absorbent bricks, bad brick jointing, inadequate cement or bad sand in the plaster mix, paint applied before the plaster is dry and use of cheap, inadequate and incorrectly applied paint finishes.
The presence of lateral damp is evidenced the same as rising damp, by white efflorescence, damp brown patches, green algae and a deterioration of the plaster and paint coverings.
VERTICLE DAMP is water entering the masonry through the roof or upper floor exterior balcony.
CONDENSATION DAMP is caused through lack of ventilation and extreme differences in temperatures between the exterior and interior surfaces. Condensation is often a lot worse if there is an existing defect in the waterproofing system used.
N.B. DAMP PROBLEMS “MUST” BE SOLVED IN ORDER TO ENSURE A LONG LASTING PAINT AND COATING FINISH.
A typical dampproofing procedure >