Normally people will call us after they start to smell stale or musty odours. This is a sure sign of excessive moisture in the subfloor. All mouldy or must odours are caused by trapped moisture in a confined space.
Is excessive moisture dangerous for me or my home?
The danger lies in long term exposure to excessive moisture which will damage all kinds of building materials including timber flooring, mortar and bricks. Fungal growth on damp soil is extremely common and is proof of a poorly ventilated and overly wet subfloor void.
Is immediate drying a requirement all the time?
No, immediate drying is generally required after a flood event or other water ingress event. When large bodies of water are dumped into a subfloor, the impact can be profound and very fast. Following high scale flood events it is not unusual for floor boards to start cupping with 48 hours unless immediate action so taken. In this instance immediate drying is always a requirement.
Sadly a lot of insurance companies do not understand the connection between high impact flood events and building deterioration and do not take it seriously enough.
Is heat required?
YES. Heat is vital where fast or immediate subfloor drying is required as heat drying will be up to 10 times faster than cold drying (which is the traditional method using cold air movement). The more heat the better provided the exhausting of the evaporating moisture can be controlled at the same time through the use of exhaust fans and dehumidifiers.
Is subfloor ventilation always required or only after flood events?
The more ventilation the better is our company motto. Good ventilation is always a requirement and you cannot get enough controlled ventilation in any subfloor.
There is generally a distinction made between ventilation following flooding and ventilation requirements when no flooding has occurred. If the symptoms of a lack of ventilation are apparent and no flood event has occurred, mechanical ventilation is the solution to this issue. If a flood has occurred then drying will generally be required in the first instance, but the addition of mechanical ventilation is typically required to maintain the exhausting of evaporating moisture on a long term and permanent basis. Sadly most insurance companies do not understand this and do not cover the installation of mechanical ventilation following flooding and then drying. From our extensive experience, adding mechanical ventilation after a flood and after drying is always required.
What is mechanical ventilation?
Mechanical subfloor ventilation is the installation of a powered system using fans and ducting which provides cross flow and lateral ventilation to the entire subfloor void, taking the place of passive ventilation (which is the installation of passive vents in the external brick work of the building).
The system size is determined by the area of the void (m3) which needs to be ventilated. The systems are switched via digital timers which control when and how often the systems are operating. The size of the system determined by a simple mathematical calculation as is the time the system is operational. The fans generate noise but the system can be run at times which suit the people residing in the dwelling.
Why use a specialised subfloor Drying Trailer
The Dragon - purpose designed diesel fired heater which pumps large volumes of warm air into the subfloor, dramatically reducing drying times in the subfloor due to the evaporation process. Our portable diesel fired heater offers the same heat benefits as the trailer but we can use it in difficult locations.
Subfloor dehumidifiers are designed to fit into low access subfloor crawlspaces and they remove the moisture vapour from the subfloor.