25 x 219mm Moisture Resistant MDF Windowboard N&T Primed 3.66m

The 25 × 219 mm Moisture Resistant MDF Windowboard N&T Primed – 3.6 m is a high-performance internal MDF windowboard designed for wider and deeper window reveals. Manufactured from moisture resistant (MR) MDF, it offers improved dimensional stability and durability in areas exposed to occasional humidity, making it suitable for kitchens, bathrooms and utility rooms.

With a 219 mm depth, this primed MDF windowboard is ideal for deeper wall constructions and modern cavity walls, providing excellent coverage over masonry, plasterwork and window linings. The Nose & Tongue (N&T) profile allows for accurate jointing between boards, creating a clean, professional finish across longer runs.

Supplied factory primed, the board requires minimal preparation and delivers a smooth, high-quality painted finish, making it a reliable choice for both new-build and refurbishment projects.

Key Features

• Moisture Resistant MR MDF windowboard for internal use

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

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

• 25 mm thickness for strength and rigidity

• 3.6 m length for fewer joints and faster installation

• Factory primed for easy painting

• Smooth, consistent surface

Typical Applications

• Internal MDF window sills

• 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 and humidity compared to standard MDF

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

• Requires only light sanding before final paint finish

• Intended for internal use only

Technical Specification

• Product Type: MDF Windowboard

• Material: Moisture Resistant MDF

• Profile: Nose & Tongue (N&T)

• Thickness: 25 mm

• Depth: 219 mm

• Length: 3.6 m

• Finish: Primed

• Use Class: Internal

Why Choose a 219 mm MR MDF Windowboard?

The 25 × 219 mm MR MDF Windowboard N&T Primed – 3.6 m is an excellent solution where deeper reveals or wider window sills are required. Combining moisture resistance, clean jointing and a smooth painted finish, it offers a cost-effective and professional alternative to solid timber windowboards for modern interior joinery.