Vapour barrier sheeting protects homes by preventing water vapour from escaping from the building envelope. Leaking vapour barrier can lead to condensation in the walls and wood rot. In Canada the Canadian General Standards Board (CGSB) developed a standard for greatly improved vapour barrier that is now a requirement of the building code for new home construction. Film made to meet the requirements of CAN/CGSB-51.34-M8 has clearly defined and tested properties which can only be achieved with first quality ingredients and careful manufacture and testing. The film also needs to contain stabilizers that are designed to ensure that the film will last the lifetime of the house.
For a product that meets ASTM E1745 Class A requirements.
- Wall and ceiling vapour barrier
- Foundation damp-proofing
- Sill and plate poly
- Eaves protection
|3 June 2004||CGSB Manufacturing Specifications|
|Specifications||Min||Max||Units||ASTM Standard||Layfield Typical Values|
|Resin Density||0.905||0.930||g/mL||D 1505||0.920|
|Resin Melt Index||-||1.5||g/10 min.||D 1238||0.9|
|Tensile Strength - MD/TD||12/8||-||MPa||D 882 A||13.5/9.5|
|Elongation - MD/TD||225/350||-||%||D 882 A||450/600|
|-||Microns||D 2103||6 mil +/-10%|
|Dart Impact||300||-||Grams||D 1709||425|
|Oxidative Induction Time||30 min @ 190 C||-||Minutes||D 3895||47 min|