Moisture-Resistant Plasterboard for Bathrooms: Fitting Guide

What moisture-resistant plasterboard actually does

Pladur is a brand name, although it is widely used in Spain as a general term for plasterboard. When discussing specifications, ask for moisture-resistant gypsum plasterboard and the exact product reference rather than simply requesting green board.

The board is manufactured to reduce water absorption. Its face is often green, but colour alone does not confirm its performance or permitted uses. Check the manufacturer's classification and technical guidance for the particular product.

Neither option cures an existing building defect. A leaking pipe, rain penetration or rising damp must be investigated before the wall is covered. Concealing damp behind a new lining can allow damage to continue unnoticed and make future repairs more disruptive.

Where to use it in bathrooms and kitchens

Typical applications include bathroom walls outside the shower, suspended ceilings and domestic kitchen wall linings. These rely on intermittent humidity, adequate ventilation and installation within the chosen system's limits.

For heavily used showers or persistently wet conditions, a cement-based or specialist tile-backer board may be preferable. Do not assume that a different board automatically removes the need for a waterproofing membrane.

A coastal location does not make green board compulsory everywhere. Equally, a holiday home left closed for months may suffer condensation even when nobody is showering. Extraction and moisture control remain essential.

Materials, tools and checks before starting

Useful tools include a tape measure, level, straightedge, utility knife, depth-controlled screw gun, metal snips and finishing tools. Wear gloves, eye protection and respiratory protection appropriate to the dust produced.

Locate concealed services before drilling. Where electrical services could be affected, switch off the supply at the consumer unit and verify that it is dead using a suitable voltage detector. In Spain, new electrical installations and extensions require an authorised installer and the relevant electrical certificate, often called a boletín, under the REBT. Gas work is never a DIY task: use an appropriately authorised contractor.

How to build the framework and fit the boards

1. Prepare and set out. Resolve damp, check dimensions and mark service routes, fixtures and finished wall positions.
2. Install the framing. Fit perimeter strips and anchors as specified. Stud spacing depends on height, board arrangement and finish; tiled walls may need a stiffer assembly.
3. Add supports before boarding. Plan fixing points for vanity units, basins, grab rails and screens. A wall-hung WC needs a purpose-designed frame with suitable structural anchorage.
4. Cut and position boards. Follow the specified joint arrangement and leave the required clearances at floors and adjoining surfaces. Avoid standing boards directly on a damp floor.
5. Drive screws carefully. Heads should sit just below the surface without tearing the paper. Follow the specified fixing centres and distances from edges.

Suspended ceilings need their own properly designed hangers and anchors fixed into a suitable load-bearing substrate. Do not copy wall framing details or hang heavy fittings from plasterboard alone.

Jointing, waterproofing and tiling correctly

Treat board joints with the tape and compound specified for the system, allowing each stage to dry. Tile adhesive is not a substitute for joint treatment. Remove dust and apply the required primer before continuing.

Tiles and grout alone do not provide dependable waterproofing. Choose an adhesive compatible with the membrane and tile size, and check the allowable finish weight for the complete wall system.

Preserve movement joints and use flexible seals where required. For painted surfaces outside wet zones, choose a suitable bathroom or kitchen finish. Mould-resistant paint may help with surface maintenance, but it cannot compensate for persistent condensation or an unresolved leak.

Common mistakes, upkeep and indicative costs

Frequent mistakes include assuming green board is waterproof, sealing only the joints, forgetting supports and fitting heavy tiles without checking the wall specification. Closing a wall before checking concealed pipework is another avoidable risk.

A useful trade tip: photograph service routes and supports before boarding. Keep product information and provide access panels wherever future inspection or maintenance is needed. Afterwards, inspect flexible seals, maintain ventilation and deal with leaks promptly. Softened or distorted board needs assessment, not simply another coat of paint.

As a broad guide, a straightforward moisture-resistant wall lining might cost around €35–€65/m² installed. A framed partition boarded on both sides may be approximately €50–€90/m², while waterproofing beneath the finish could add about €20–€45/m².

These are indicative ranges, varying with material quality, existing condition and location. Small jobs, demolition, difficult access and extra supports can increase costs. Ask whether VAT, decoration, tiling and waste removal are included rather than comparing headline square-metre rates alone.

When to bring in a professional

Professional help is particularly worthwhile inside showers, for suspended ceilings, where leaks remain unexplained or where the wall must carry substantial loads. It is also advisable when concealed plumbing, electrical work or layout changes are involved. Cutting boards is relatively straightforward; making every junction work reliably is the more demanding part.

Compare equivalent scopes. A price for boarding alone is not the same as a fully prepared, waterproofed surface ready for tiling. If your property is on the Costa del Sol, ReformaClick can help you find renovation companies and request a no-obligation quotation for your project.