The results of such elevated moisture levels can be very serious and include the following:

This plywood roof sheathing had a moisture content of over 20% (normal would have been 8-12%). The black stain is a fungal wood rot. It will destroy the wood and may cause health problems.

• Mold and mildew
• Damage to framing, plaster, and finishing materials
• Pest infestation
• Interior and exterior paint damage (a common cause of blistering paint)
• Roofing deterioration - yes! high interior moisture levels can damage roofing materials and reduce the life of the roofing.