Comparisons
MDF vs Plywood: Which Belongs Where
Updated 2 min read
The short answer
It is not a contest — they do different jobs. Plywood is the right carcass material because it is strong, holds fasteners and spans without sagging. MDF is the right material for painted doors, panels and trim because it is dead flat, has no grain to telegraph through paint, and does not move seasonally. A good cabinet usually contains both.
Side by side
| Property | MDF | Plywood |
|---|---|---|
| Flatness | Excellent — no grain, no voids | Good, can have minor variation |
| Seasonal movement | Negligible | Low but present |
| Screw holding in a face | Adequate | Good |
| Screw holding in an edge | Poor | Good |
| Strength over a span | Sags under load | Strong |
| Weight | Heavy | Lighter |
| Water resistance | Poor — swells and stays swollen | Better; recovers from brief exposure |
| Takes paint | Excellent | Grain telegraphs unless filled |
| Takes stain | No | Yes |
| Machined profile edges | Excellent — crisp | Poor — exposes plies |
Use MDF for
- Painted door panels
- It will not shrink within the frame and crack the paint line each winter, which is exactly what solid wood does in Calgary.
- Painted trim and mouldings
- Crisp machined profiles, dead flat, no joints telegraphing through.
- Wall panelling and wainscoting
- Large flat areas that must stay flat and take paint evenly.
- Applied decorative elements
- Battens, picture-frame moulding, coffered ceiling components.
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Use plywood for
- Cabinet carcasses
- Holds fasteners at the edges, stays flat, carries load. This is the single most important use.
- Shelving
- Anything spanning more than about 800mm under load. MDF shelves sag and stay sagged.
- Anything near water
- Sink bases, mudroom plinths, laundry, garage. MDF swells irreversibly.
- Anything to be stained or clear-finished
- MDF has no grain, so there is nothing to show.
- Drawer boxes
- Where solid wood is not used, plywood is the next best. Not MDF.
Answers
Frequently asked questions
- Are MDF cabinet doors lower quality than wood?
- For painted doors in a dry climate, no — arguably the opposite. MDF panels do not shrink within their frames, which is the main cause of the hairline cracks that appear at painted panel joints every Calgary winter. Solid wood is the right choice for stained doors, where the grain is the point.
- What happens if MDF gets wet?
- It absorbs water, swells, and does not return to its original dimension when it dries. That is why it is the wrong material at floor level in bathrooms, mudrooms and laundry rooms, and why sink base cabinets should be plywood.
- Is there a moisture-resistant MDF?
- Yes, moisture-resistant grades exist and perform better than standard MDF in damp conditions. They are not waterproof, and for genuinely wet locations plywood or a dedicated moisture-tolerant panel remains the better specification.
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