Homeowner checklist

Vapour-retarder classes and the wall around them

Use these steps to plan, check and keep a record of your next actions.

• Request product thickness, test conditions and vapour-class evidence.
• Have existing coatings, facings and membranes identified.
• Ask where moisture-sensitive layers sit in winter and summer.
• Confirm the local design requirement and intended drying route.
• Retain the approved assembly details before materials are concealed.

Notes & questions to follow up