Replacement is an opportunity to review insulation, slopes and moisture control. The assembly should be designed as a whole, rather than simply adding thickness.
Check the condition before adding insulation
Wet or compressed insulation may no longer perform as intended. Required checks depend on access, covering and observed symptoms. The estimate should explain how deteriorated areas discovered during work will be handled.
Coordinate slopes and heights
Added insulation changes heights at drains, parapets and doors. Tapered insulation can help direct water, but its layout must account for outlets and the complete roof configuration.
Distinguish leakage from condensation
Moisture marks can have several causes. Air leakage, indoor vapour and the roof assembly influence condensation risk. Identify the cause before selecting corrective work.
Points to assess
- Known roof composition and indoor use
- Moisture, discontinuities and connections
- Available thicknesses and finishing heights
Read the complete service guide: Roof insulation and vapour control