Description
The 18mm V Grooved Primed Long Grooved Moisture Resistant MDF is the heavyweight of this panelling range. It carries the same crisp V grooves running the full 2440mm length of the 2440 x 1220mm sheet, at 101.6mm centres, but at double the thickness of the 9mm boards. That extra body changes what the panel can do.
What the depth adds
Going from 9mm to 18mm does two things.
First, the V grooves are cut deeper into the thicker face, so the shadow lines read stronger and the panelled effect looks more pronounced and architectural across a wall.
Second, the board is far more rigid. It spans better between fixings, sits flatter over a slightly uneven wall, and feels substantial rather than springy once you handle it.
The factory primer
The face arrives ready primed in white, using a high opacity waterborne primer sprayed on at the factory. That base is built to be painted over, not left as it is. Give it a light key with fine abrasive, fill and spot prime any screw heads or cut edges, then apply your topcoat. The primer accepts both water based and solvent based pigmented topcoats, so you can use whichever paint system your decorator prefers. Because it already sits evenly across the flats and into the grooves, two topcoats usually bring the surface up to a clean, uniform finish.
Made for humid rooms
This is the moisture resistant grade, an MR medium density board that copes with the damp air of bathrooms, kitchens, en-suites and laundry rooms far better than standard MDF, which tends to swell and lose its surface in those conditions. As with the rest of the range, it is an interior board only. It resists humidity in the air, but it does not shrug off direct water, so splash zones, standing water and any outdoor use are out.
Joining the boards
This is a long grooved sheet, so the grooves run the length of the board, and the edges are square cut to butt together. On the wall, that means:
- Grooves down the full 2440mm. Hung upright, they give long, continuous vertical lines.
- A half groove on each long edge. Two sheets brought together turn their half grooves into a single full groove at the usual 101.6mm spacing.
- The join hides in the pattern. That seam becomes just another groove, so there is no obvious line between sheets.
- A butt fit, not an interlock. There is no tongue and groove, so the boards sit edge to edge, and the half grooves line the pattern up for you.
Applications
- Feature walls and chimney breasts, where the deeper grooves give a stronger, more architectural shadow line
- Fitted furniture and panelled units, where the 18mm body is rigid enough to build with, not just clad onto
- Bath panels and shower surrounds, where the thickness adds a solid, built-in feel, away from direct splash zones
- Reception desks, bar fronts and counter ends, where a robust panelled face takes daily wear in commercial spaces
- Bench seating and window seats, where the board carries its own weight across a span
- Skirtings and panelled dado sections, where the thickness matches the surrounding joinery
- Ceilings and soffits, where the extra rigidity holds a flat line, are fitted by two people into joists or battens
This is a non structural decorative panel, made from FSC certified eucalyptus and pine fibre and produced to meet the EN 622-5 fibreboard standard, with an E1 low formaldehyde rating.
At 18mm, the 8×4 sheet weighs about 36kg, so this is a two-person lift for carrying, positioning and especially overhead work. Plan your fixings and access before you lift it.
