Presents Cost-Effective Solutions to arrest any type of Water Leakages in Civil Structures:
Damp Proof Course (DPC) for Rising Dampness
What is Rising Dampness?
Rising damp in buildings may be defined as the vertical flow of water up through a permeable wall structure, the water being derived from ground water. The water rises through the pores (capillaries) in the masonry by a process termed ‘capillarity’. In other words the masonry acts like a wick. The height to which the water will rise depends on several factors including pore structure and rate of evaporation. Masonry containing a high proportion of fine pores will allow the water to rise higher than coarse pored material; basically the water is carried up the wall in the finer pores and not those of large diameter. The average size of pores in masonry gives a theoretical rise of around 1.5 meters but where evaporation is severely retarded, for example by the use of impervious membranes, tiled surfaces or surfaces behind wardrobes and cupboards/cabinets, moisture can sometimes rise in excess of 2 metres.
Water rising through mortar beds of brick walls
Residual salt deposit after walls dry up
The Symptoms...
Flaking paint, peeling wallpaper, a “musty” odour, and timber decay are among the most common symptoms of rising damp. Failure to treat the problem properly can result in a house that is unpleasant to live in and difficult to sell, so it is important to choose an effective method of treatment.
Damaged Walls due to Rising Damp
Our Treatment….
We use a special damp-proofing cream that is introduced along the mortar course at regular intervals by injecting it into pre-drilled holes. The cream then diffuses before curing to form a continuous water-repellent barrier. This prevents the damp from rising up the wall.If the existing mortar joint to be injected is found defective, it we will have to be repaired with fresh mortar in order to aid complete diffusion of the damp-proofing cream.
Holes drilled at 150 cms
Drilling Procedure and Location of Drill Holes
Injecting Damp-Proofing Cream
Final Step-Replastering
Replastering…
In order to complete an effective damp-proofing system, it is extremely important that the new plasterwork which replaces the salt contaminated material resists the passage of residual moisture and contaminant salts from passing from the underlying substrate through to the new decorative surface. This procedure is important because the underlying wall can take many months to dry down following damp-proofing, but more importantly, the base of the wall may always remain damp due to the inherent limitations of the actual injection damp-proof course. Finally it is important to understand that chemical damp proofing is a two step system to take complete effect. Step 1 - The injection of the DPC and, Step 2 – The Replastering.
Links
http://www.youtube.com/watch?v=xeWpR-ZF7xYInj Grouting
http://www.youtube.com/watch?v=N3NNdH_wo7whttp://www.youtube.com/watch?v=n92nE3jWeiM
http://www.youtube.com/watch?v=yJzeCZ6dGr0