25 x 269mm Moisture Resistant MDF Windowboard N&T Primed 3.66m

The 25 × 269 mm Moisture Resistant MDF Windowboard N&T Primed – 3.6 m is a premium internal MDF windowboard designed for very deep window reveals and extra-wide internal window sills. Manufactured from moisture resistant (MR) MDF, it delivers improved stability and durability in environments subject to occasional humidity, making it suitable for kitchens, bathrooms and utility rooms.

With its 269 mm depth, this primed MDF windowboard is ideal for deep cavity wall construction, thick masonry and wide reveals, ensuring full coverage over plasterwork, blockwork and window linings. The Nose & Tongue (N&T) profile allows accurate alignment and secure jointing between boards, producing a clean, continuous finish across long window openings.

Supplied factory primed, the board reduces on-site preparation and provides an excellent base for a smooth, high-quality painted finish. It is a practical and cost-effective solution for both new-build and refurbishment interior joinery projects.

Key Features

• Moisture Resistant MR MDF windowboard for internal use

• 269 mm depth – ideal for very deep window reveals and wide sills

• Nose & Tongue (N&T) profile for neat, secure jointing

• 25 mm thickness for strength, rigidity and durability

• 3.6 m length to reduce joints and speed up installation

• Factory primed for quick and easy painting

• Smooth, consistent surface for professional finishes

Typical Applications

• Internal MDF window sills

• Very deep window reveals and wide window openings

• Kitchens, bathrooms and utility rooms

• Residential and commercial interior fit-outs

• New-build and renovation projects

Performance & Workability

• Enhanced resistance to moisture compared to standard MDF

• Easy to cut, machine, joint and fix using standard woodworking tools

• Requires only light sanding prior to final paint application

• Intended for internal use only

Technical Specification

• Product Type: MDF Windowboard

• Material: Moisture Resistant MDF

• Profile: Nose & Tongue (N&T)

• Thickness: 25 mm

• Depth: 269 mm

• Length: 3.6 m

• Finish: Primed

• Use Class: Internal

Why Choose a 269 mm MR MDF Windowboard?

The 25 × 269 mm MR MDF Windowboard N&T Primed – 3.6 m is the ideal choice where maximum depth and coverage are required for internal window sills. Combining moisture resistance, clean jointing and a smooth painted finish, it provides a dependable and economical alternative to solid timber windowboards for modern interior joinery and fit-out work.