EasierVentilation

1 | John

September 18th, 2009 at 4:13 pm

I have been informed by a builder repairing houses with leaky build problems of moisture condensing inside the wall cavity from positive pressure systems. Overseas many houses are brick with cavities vented to the roofspace. this prevents the problem but here wall ventilation is not addressed. Gib board is porous even if painted and powerpoints give a passage for air.
The theory of moisture being pushed into the cavity and condensing on the cold building paper or weather boards is likely and could bring about the next leaky house syndrome with older untreated houses rotting from the inside. (I hope the likes of HRV & DVS are well insured).

2 | charles

September 25th, 2009 at 11:35 am

This problem will be happening in a home without a positive pressure ventilation system as it is the execss moisture that is condensing. So every time you have condensation on your windows condensation will also be forming on the cold building paper inside your walls.
Installing a positive pressure ventilation system will help cure this problem as we are drying out and removing the cause of the condensation from the home, therefore stopping the condensation before it happens anywhere in your home. we are not just putting a bandaid across the problem.