Here are 4 typical indoor mould situations and recommendations you can offer clients for combating them:
Mould growth on inside faces of exteriors walls
Commonly caused by inadequate insulation that allows interior wall surfaces to become cold enough in the winter to cause condensation. Increase ventilation by moving beds, dressers and desks further away from walls, use fans to move air and lower indoor humidity levels with a heat recovery ventilator.
Ventilation fans in most bathrooms are under-sized and under-used, leading to chronically high humidity levels. Encourage clients to run bathroom exhaust fans for 20 minutes after each shower and to replace existing fan with higher capacity model. Aim for a fan that moves 10x to 12x the air volume of the bathroom each hour.
Mould on window frames
This is also caused by indoor wintertime humidity levels that are too high, so and HRV can definitely help. Most homes need a relative humidity level lower than 40% to prevent running window condensation when outdoor temperatures are lower than 15C. Even still, clients should keep curtains open as much as possible during cold weather, especially at night. Lack of ventilation in front of windows during cold snaps will cause running window condensation to develop even when indoor humidity levels are otherwise low enough.
Mouldy attic access hatch
Most attic hatches are simply uninsulated pieces of drywall, and this means they get cold enough in winter to form condensation. Glue a 2” thick layer of foam to the top of the hatch to keep it warm and condensation free.
These are just some of the products will help sure help you get the job done.