Efflorescence, subfloor ventilation and rising damp | melbournebrickrepair.com

With salts permeating through this subfloor structure located in Brighton, VIC, it was apparent that there was something very wrong.


Efflorescence, aka salt attack is a calcium chloride/ zinc chloride build up caused through moisture in the subfloor or rising damp from subfoundation soil.

When viewed from behind the wall, the salt attack was much worse; formations of hygroscopic gel and rust was evident.


Through constant hygroscopic moisture (airborne) contained in the subfloor area, and the lack of ventilation, the damage to the bricks is inevitable.

Ideally, repairs should occur at a time prior to the state of deterioration as indicated.

Contact melbournebrickrepair.com for further information on subfloor conditions.

Cathodic Protection: What is it? Concrete Repair Melbourne


Formations of Iron Hydroxide (FeHO2), otherwise known as brown rust, on Steel Reinforcement. All rust should be removed prior to pouring concrete.

Cathodic Protection, is the practice of controlling the electrical conductivity, and subsequent electro-chemical deterioration, of mainly buried and submerged metallic (ferrous) structures and objects.

In electrical physics, where ‘anodes’ are positive and the ‘cathode’ are negative, the benefit of sacrificing anodes in order to protect the structural ‘cathodes’ is a directive that allows for extended structural service/design life.

This enables buried or submerged metallic structures to be protected and maintained. Structures such as bridges, tunnels, viaducts, culverts, weirs, marinas, wharves, docks and ports are high risk and need to be protected.

We can happily remedy any efflorescence (calcium carbonate or ‘calcification’), iron hydroxide (brown rust) formation and other effects, such as hygroscopic gel (sodium silicate gel) formation AKA ‘concrete cancer’ or ‘alkali-silica reaction