A roofing specialist may consider using a biocide treatment in situations where there is significant moss, algae, or lichen buildup on the roof. Biocide treatments are designed to kill and inhibit the regrowth of organic growth, providing a longer-lasting solution to prevent further infestation. Here are a few examples of when a biocide treatment may be considered in New Zealand:

  1. Severe Moss Infestation: If the roof has extensive moss growth with deep roots and covering a large area, a biocide treatment may be recommended. This is especially true for roofs that are prone to dampness or receive limited sunlight, creating favorable conditions for moss growth.
  1. Persistent Algae and Lichen: Algae and lichen can be challenging to remove completely, as they often form intricate structures that cling to the roof surface. In cases where conventional cleaning methods have not been effective, a biocide treatment can be used to kill the algae and lichen and inhibit their regrowth.
  1. Roof Preservation: Biocide treatments can also be used as a preventive measure to protect the roof from future moss, algae, or lichen infestation. This is particularly beneficial for roofs located in shaded areas or regions with high humidity, where organic growth is more likely to occur.
  1. Environmentally Sensitive Areas: In environmentally sensitive areas, where the use of harsh chemical cleaners may have negative impacts on surrounding vegetation or water sources, a biocide treatment can provide a more environmentally friendly alternative. Biocides are typically designed to have minimal impact on the environment while effectively targeting the organic growth on the roof.

It’s worth noting that the use of biocide treatments should be carried out by trained professionals who understand the appropriate application methods and safety guidelines. Local regulations and guidelines in New Zealand may also dictate the use of specific biocide products or require certain precautions to be followed.

When consulting with a roofing specialist in New Zealand, they will assess the condition of your roof and determine if a biocide treatment is necessary or if other cleaning methods will suffice. They will consider factors such as the severity of the growth, the roof’s material, and the environmental considerations to provide the most suitable solution for your specific situation.