Plaster repairs are essential as the damage caused by Salt Attack is often worse than the damp itself
The Second Stage: Plaster Repairs
You will often hear us refer to plaster repairs – the second stage of treatment as being the most important. Whilst the treatments offered by Tech-Dry are 100% effective in stopping the rise of new moisture and trapped salts into masonry walls it does not elimate any of the existing moisture and salts.
By the time we inspect many properties, the damp and salts have been in the wall for a long period of time. Salts have deposited just below the surface and begun to break down the plaster causing it to blister and bubble. These salts on the surface have also attracted additional moisture causing a cycle of additional damage.
If the old plaster is not removed and replaced then this cycle will continue. A moisture meter will still pick up high readings and the damage will continue to rise. Therefore the extraction of salts trapped within the wall is an important second stage to help prevent further salt growth and decay of the building.
“Chemical impregnation must be combined with sacrificial treatments and/or desalination for it to be a successful treatment for salt damp”
Rising Damp and Salt Attack Publication – David Young.
The Process of Plaster Repairs
After the salt damp treatment, your walls have time to “dry out”. This allows for most of the moisture and salts from within the wall to evoporate to the wall surface. In most properties, this will be a minimum of 3 – 6 months but it can last up to 12 months depending on the thickness of the wall. During this time you may begin to notice that the plaster gets worse, the blistering and bubbling continues and a tide line may get higher.
It is important that this dry-out period occurs as specified before the plaster repairs begin.
On completion of the dry out time Tech-Dry will undertake the following stages:
- Removal and Replacement of salt affected interior plasterwork
- Removal and Replacement of salt affected exterior rendering
By using Tech-Dry SA’s qualified solid plasterers you avoid any issues with the plastering down the track.
In some cases, where the salt attack has been extreme Tech-Dry will recommend (during the dry-out period) ongoing application and removal of the following to assist in the process of desalinating walls.
- Poulticing – application of a sacrificial layer of cocoon poultice which draws the salts and moisture from the masonry.
- Sacrificial Plastering / Sacrificial Repointing – again application of new plastering / repointing to draw salts and moisture from the masonry. This option requires regular maintenance.
Due to the high levels of salts trapped within your walls a re-occurrence or “bleed out” of salts on your wall may occur as the salts migrate to the surface from deep within the walls. This is unavoidable and impossible to predict during your treament.