MDF Window Board MDF Window Board provides a smooth, factory-primed sill for neat, durable internal window finishes. Manufactured from high-density MDF (standard or MR), boards are easy to cut, fix and paint—an affordable, clean-looking alternative to timber for refurbishments and new builds. About MDF Window Boards Our boards are precision-milled with either a bullnose or square front edge and supplied primed to save time on site. Choose standard lengths/heights or ask for cut to size for a perfect fit with minimal waste. Material: Standard or Moisture-Resistant (MR) MDF Finish: Factory primed, paint-ready Edges: Bullnose or square Sizes: Standard stock sizes or custom cut on request Use: Interior sills and reveals (not for external use) Typical Uses Internal window sills and reveals Replacement sills in renovations and refits New-build interiors needing a fast, paint-ready finish Matching with MDF architrave and skirting for a complete trim package Key Features Primed and paint-ready for rapid installation Smooth, defect-free surface (no knots, splits or grain raise) MR option for humid rooms (bathrooms, kitchens—avoid standing water) Stable, low-warp substrate with crisp edges Custom sizes available; easy to cut and fix Why Order from MDF Direct We stock popular sizes for fast UK delivery and offer a cut-to-size service for exact fits. Friendly advice via phone, email or Live Chat—plus matching skirting and architrave to finish the room. Frequently Asked Questions 1. Can you cut to my measurements? Yes—send your sizes and we’ll supply cut-to-size boards. 2. Is MR MDF waterproof? No—MR resists humidity, not water ingress. Seal all cut edges and paint fully; avoid prolonged moisture. 3. Which edge should I choose? Bullnose gives a traditional rounded face; square suits modern, minimal interiors. 4. How do I install it? Dry-fit, apply grab adhesive to the substrate, bed the board, then pin if needed. Fill, denib the primer and apply two topcoats. 5. Do you supply matching trims? Yes—see our MDF skirting boards and architrave ranges for matching profiles.
