If restoration cannot be commenced immediately, infested areas should be treated / disinfected temporarily without swirling any dust. It is important to observe all protective measures listed in the Bio-Substance Ordnance even for these temporary measures!
Before mould restoration measures are taken, the causes of the mould always need to be clarified and remedied. The measures that need to be taken in the event of damage are differentiated into short-term and long-term measures.
It is fundamentally important for successful restoration that the causes of the mould infestation are remedied. On-site construction damage must be remedied and the users of the room must be informed about how mould infestation can be avoided in the future.
What are the causes of mould infestation?
The cause of the mould infestation is usually higher levels of moisture in the respective building material and/or its surface. In addition to ‘moist walls’ that are the result of inadequate driving rain protection or ‘rising’ damp, the cause is often due to insufficient thermal insulation standards in old buildings and simultaneous reduction of air exchange rates as a result of constructive changes. Often, new windows are installed without improving the insulation of the external walls. This can cause the humidity on the wall surface to increase and lead to mould infestation. For this it is not even necessary for condensation to be created - humidity levels of approx. 70 % are sufficient.
Hygiene and occupational safety
In advance of public tenders, the customer must always carry out examinations with respect to the suspected and/or existing biological workplace substances (see Bio-Substance Ordnance - BioStoffV). Wearing time limits for respiratory equipment according to the employers' liability insurance association regulation ‘Use of respiratory equipment’ (BGR 190) must be considered in the construction time plan. Before starting work, we advise contacting the responsible employers' liability insurance association with any questions about health & safety.
General hygiene measures for work with biological workplace substances if there is ‘no special risk’.
Manager tasks pursuant to the Industrial Safety Act and Bio-Subst
The company owner must design the work so that no risks emanate from the biological workplace substances. In particular, he must ensure that machines and equipment are procured and equipped so that the above-mentioned requirements are fulfilled. This is realised by taking suitable protective measures resulting from the risk assessment. The company owner must document the risk assessment, define and take suitable technical, organisational and personal protective measures, draft operating instructions and brief the employees on the basis of these instructions.
Sequence of protective measures
The basic rule of health & safety is to take technical measures to minimise corresponding risks. Organisational and personal protective measures should only be taken if this is not possible. This sequence is stated in various guidelines and is marked TOP: technical, organisational, personal.
Occupational preventive medical examination
When restoring buildings, the initial focus should be on occupational preventive medical examinations according to G26 (working under respiratory equipment). Also, obstructive respiratory illnesses, skin exposure, in particular when working in the wet and in case of contact to faecal waste water, and the potential risk of infections should be considered.