3. Artificial cooling of buildings in some climates can cause condensation to form inside the layers of the building envelope such condensation can cause significant structural or cosmetic damage to the envelope before it is detected. Associated mould growth may also create health risks to the occupants. Effective control of condensation is a complex issue . In some locations a fully sealed vapour barrier may need to be installed on the more humid, or generally warmer, side of the insulation . Placing some of the required insulation at the roof level may result in a more practical outcome. Insulation at the roof level is effective in warm climates and significantly moderates the roof space extremes and condensation risk in cold climates.
184.108.40.206 TOTAL R-VALUE FOR TYPICAL ROOF AND CEILING CONSTRUCTION
6 .... Insulation should be installed with due consideration of condensation and associated interactive with adjoining building materials.
WHAT DO YOU CURRENTLY DO TO PREVENT CONDENSATION FORMING INSIDE THE BUILDING ENVELOPE?
As we increase our insulation due to requirements in the Building Codes we create a greater Delta T. Delta T can be the temperature difference between the inside and the outside of a residence and anywhere where there is a difference of 8 degrees or more condensation will form. A fully sealed vapour barrier should be mandatory for any builder who does not want warranty calls for mould. Please remember mould is a warranty defect and condensation is very hard to prevent, if prevention is not properly applied at the beginning of construction the costs to rectifying this later are insurmountable in comparison PLEASE NOTE: Foil wraps generally don’t carry a warranty and being over 90% metal have the ability to corrode. We suggest using P2000 which has a 20 year product warranty. PREVENTION
Cavity fill vs. Continuous cover Thermal break
Only 16mm of P2000 is required to insulated the above configuration as per BCA
With only 9mm additional of product is equivalent to +6.0 R-Value in fiberglass