As a homeowner, the damage caused by water and flooding to plasterboard walls is a matter of great concern. It is imperative to take prompt action to remediate the situation, as the ingress of moisture can have a detrimental impact on the structural integrity of the walls. The nature of the water source, the duration of exposure, and the levels of moisture present in the affected areas, are all critical determinants in determining the appropriate course of action.

In the event that the water source is contaminated, for example, from a sewage source or a creek, the plasterboard must be replaced, as the presence of harmful substances may pose a health risk to the occupants of the home. Additionally, if there is evidence of mold growth on the affected plasterboard, it is advisable to replace the material, as it is difficult to completely dry the layers and the growth of mold may pose a threat, particularly to those with respiratory conditions such as asthma or allergies.

The first 24 hours following a water event are crucial in initiating the drying process. If the insulation in the walls is also wet, this presents a significant challenge as it is extremely difficult to completely dry the material. The presence of wet insulation provides a conducive environment for the growth of mold, hence, the plasterboard must be removed expeditiously to enable the framing to dry out.

The use of a moisture meter, such as the Trotec T660, is recommended to assess the extent of moisture in the affected area. A moisture reading in excess of 100 may compromise the adhesion of the plasterboard, and it is advisable to cut away 300mm from the affected plasterboard. In the case of flood damage from hot water cylinders or low-level floods, it is recommended to cut 600mm above floor level, remove the plasterboard and insulation, to facilitate the drying of the framing.

According to the National Emergency Management Agency, floodwater can result in an unhealthy living environment, and if the affected areas are wet for more than two days, mold growth is likely to occur. Mold can be hazardous, especially to individuals with respiratory problems such as asthma or allergies.

In conclusion, the prompt resolution of water damage or flooding to plasterboard walls is crucial to maintain the structural integrity and safety of the home. It is imperative to take into consideration the type of water, the duration of exposure, and the moisture levels in the affected areas to determine the appropriate course of action. It is advisable to seek professional advice if unsure, as taking the right steps to address the issue is vital in safeguarding the health and safety of the occupants.