3534B 3-1/2" Step Casing Primed MDF is a smooth, knot-free MDF door and window casing, factory-primed and ready for topcoat. Casing frames door and window openings, covering the gap between the rough frame and the drywall to produce a clean, finished appearance. The profile and width of the casing set the visual character of the room. Available at Windsor Plywood locations across Canada.
Features
- Factory-primed MDF -- smooth, knot-free surface paints to a flawless finish without site priming
- Consistent density throughout -- no grain telegraphing, no knots, no resin bleed under paint
- Step profile at 3534 -- Interior -- door and window casing
- Available at Windsor Plywood locations across Canada -- confirm stock at your local branch
Specifications
| Material |
MDF (Medium Density Fibreboard) |
| Profile |
Step |
| Size |
3-1/2" |
| Finish / Coating |
Factory white primer |
| Application |
Interior -- door and window casing |
| Pairs With |
Matching baseboard and crown moulding -- confirm available profiles at your local branch |
| Availability |
In-store -- confirm current stock with your local Windsor Plywood location. Some products may be special order. |
Common Uses
Installed on both sides of door and window frames. Cut mitre joints at 45 degrees at the top corners using a mitre saw. Test-fit all cuts dry before nailing. MDF is a paint-only material. It does not accept stain and must be kept dry -- do not install in bathrooms or high-humidity areas.
Pro Tips
- The standard reveal (gap between the casing edge and the frame edge) is 3/16" to 1/4". Set a combination square to your reveal measurement and mark a consistent line on all frames before nailing.
- Apply two coats of quality interior latex paint in satin or semi-gloss directly over the factory primer. Seal all cut edges with primer before painting -- exposed MDF edges absorb paint unevenly.
- Use 2" finish nails into the frame and 1-1/2" nails into the drywall side. Set all nails, fill with paintable filler, and sand smooth before finishing.
Frequently Asked Questions
How do I calculate how much casing I need?
Measure the perimeter of each opening (height x 2 + width) and add 10% for waste and mitre cuts. Count total openings and multiply.
Can I use MDF moulding in a bathroom?
No. MDF absorbs moisture and swells irreversibly. Use solid wood (hemlock or cedar) moulding in bathrooms and high-humidity areas.
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