Exterior Trim
PVC vs. Wood Exterior Trim: Which Holds Up Better?
Exterior trim takes more weather than any other part of the wall, so the material matters. PVC trim has become the standard for spots that stay wet because it cannot rot, while wood trim is still the right choice for many older homes. Here is how they compare and what makes either one last.
Key points
- PVC trim does not rot and holds paint well, which makes it a common choice for sills, corner boards, and fascia.
- PVC expands and contracts with temperature, so it needs the right fasteners, joints, and gaps.
- Wood trim still suits historic homes and detailed moldings, and lasts when it is primed on all sides and flashed.
- Dark trim colors absorb more heat, so check the trim maker’s guidance before painting PVC a dark color.
PVC trim
Cellular PVC boards look like painted wood, cut and mill like wood, and never rot. They are a good fit for sills, door and window casings, corner boards, and fascia. PVC moves with temperature, so long runs need glued or properly gapped joints and fasteners made for PVC. It can be left white or painted.
Wood trim
Wood trim fits historic homes and detailed moldings, like dentil and crown, and in some historic districts it is the expected material. It lasts when it is primed on all six sides before it goes up, joined tightly, and kept painted.
| PVC | Wood | |
|---|---|---|
| Rot | Does not rot | Rots if water gets in |
| Paint | Optional, holds paint well | Needs regular painting |
| Movement | Expands and contracts with heat | Swells and shrinks with moisture |
| Best for | Sills, corners, fascia, wet spots | Historic homes, detailed moldings |
Details that make trim last
Whatever the material, the installation decides how long trim lasts:
- Flashing above windows and doors so water is sent out over the trim, not behind it.
- Tight, sealed joints, with scarf joints on long runs.
- A drip edge or bevel on horizontal pieces so water does not sit.
- Clearance between trim and roofing or the ground.
Frequently asked questions
Can PVC trim be painted?
Yes, with paint made for PVC. Very dark colors absorb heat, so follow the trim maker’s guidance on color.
Is PVC trim more expensive than wood?
The boards usually cost more than standard pine, but they save on repainting and rot repairs over time.
Can you match the trim on an older house?
Yes. Most profiles can be matched in wood or built up from PVC boards and moldings.
Need exterior trim repaired or replaced?
Cedar House Carpentry handles exterior trim across Cape Cod and the South Shore with our own in-house crew, fully licensed and insured.
See our Exterior Trim work · Find your town · (774) 470-7150