Rising Damp Specialists
Rising damp can occur for various reasons:
- Failure of an existing damp proof course
- Bridging of moisture due to high external ground level
- External rendering bridging the damp proof course
- No damp proof course installed during construction
- Raised internal solid floors
Moisture will rise by capillary action through porous materials such as bricks and mortar. Moisture from the ground will also contain salts such as nitrates and chlorides, which are hygroscopic (attract moisture from the air). Salt-contaminated wall plaster will absorb moisture from the atmosphere in conditions of high humidity, causing severe deterioration to the wall plaster and decorations.
Rising Damp Solutions
Siliconate injection damp proof course
10mm holes are drilled at 112mm centres into the mortar course, and siliconate injection fluid is injected at low pressure to form a waterproof barrier.
Injection cream damp proof course
12mm holes are drilled at 112mm centres into the mortar course, and silicone emulsion cream is injected by displacement hand pressure pump. From here, the cream migrates into the masonry pores, forming a waterproof barrier.
Salt-contaminated wall plaster will require removal after the installation of a new damp proof course. Assured Preservations carry out specialist re-plastering, which contains a salt-retardant solution, blocking the passage of water vapour and hygroscopic salts. Lightweight plasters such as Carlite bonding should not be used as they are very absorbent and hygroscopic.
We strongly recommend that re-plastering be carried out by Assured Preservations’ trained operatives after the installation of a new damp proof course.