Sealing these up and tiling the whole room will result in moulding behind the tile and eventually in a nearby room. If the inspector decides that the absence of a vent is the reason that it is possibly not sealed, you would have to add a vent and have your home gassed to minimise the number of moulds.Why is Chlorine Bleach NOT recommended for the removal of mould? Chlorine bleach (sodium hypochlorite) is corrosive and this fact appears on the label of the product. Yet the properties of chlorine bleach prohibit it from getting at the deeply embedded mycelia (roots) of mould from’ soaking into’ wood-based construction materials. The aim of killing mould is to destroy its “roots”. Reputable mould cleanup contractors use suitable materials that efficiently disinfect wood products contaminated with salvageable mould. Beware of any mould inspector or mould remediation firm that advises or uses chlorine bleach to clean up construction materials based on wood. Checkout water damage clean up.
In new mould & mildew products, chlorine bleach is an active ingredient. The presence of new household mould and mildew items on shop shelves is on the rise. Most are diluted laundry bleach solutions. The labels on these mould and mildew goods show that they are intended for use on rough, non-porous surfaces (again) and not for materials based on wood. The instructions for not applying the items were varied. One commercial mould and mildew stain remover also clearly notes that without immediate rinsing with water, it should not be applied to porcelain or metal and that the substance is not recommended for use on Formica or vinyl.
Emptor’s Caveat! Before you buy a mould or mildew product, read the advertised intent of that product and completely understand it. There may be uncertainty about the labelling statements on these new items. Some say their product is a remover of mould and mildew, while others say their product is a remover of mildew stain, and still others make similar vague statements.