Damaged exterior trim is common in Ontario's climate. Here's how to decide whether to repair or replace affected sections.
Exterior Renovation Services
Exterior trim — the decorative and functional woodwork around windows, doors, corners, and roofline — deteriorates over time from moisture exposure. Deciding between repair and replacement involves assessing extent of damage, age of the trim, and cost comparison.
Limited rot at one location on an otherwise sound trim board can often be repaired. Epoxy wood fillers are formulated for exterior use, bond well to sound wood, and accept paint over the repair. Good results require removing all soft wood before filling.
Planning Your Project
Extensive rot that affects more than 30-40% of a board's cross-section makes repair impractical. The structural integrity is compromised, and the remaining sound wood may be too compromised to hold filler reliably.
Old trim that has been repaired multiple times develops a rough, uneven profile from layered repairs. At this point, replacement with properly primed new wood or a low-maintenance alternative (PVC trim, composite) makes more economic sense.
Working With D&D Exterior Finishing
PVC trim board is increasingly popular for replacement. It won't rot, won't absorb moisture, and holds paint indefinitely. Premium PVC trim from quality manufacturers is dimensionally stable and accepts all exterior paints.
Composite trim products offer similar performance to PVC with wood-like grain texture that many homeowners prefer. They're heavier than PVC but cut, nail, and paint like wood.
When replacing trim, address the underlying cause of moisture exposure. Improved caulking at joints, corrected flashing details, and proper back-priming of new wood all extend the life of the replacement material.
Key Takeaways
- Exterior trim — the decorative and functional woodwork around windows, doors, corners, and roofline — deteriorates over ...
- Extensive rot that affects more than 30-40% of a board's cross-section makes repair impractical.
- PVC trim board is increasingly popular for replacement.
- D&D Exterior Finishing serves Kitchener, Waterloo, Cambridge, Guelph and surrounding areas
- Get a free no-obligation quote — call or book online anytime
Sources & References
- Ontario Building Code — Relevant Standards & Guidelines
- D&D Exterior Finishing field experience across Waterloo Region
