Wet Area Plastering Services SA 2026 - Get Quotes

Choosing a Sheeting Grade

Water resistant plasterboard at $42 to $90 a square metre is the usual choice for framed bathroom walls outside the shower and for ceilings. It resists moisture far better than standard board, though it is still paper faced and relies on the membrane and tiles above it. Fibre cement at $55 to $115 is unaffected by water and suits shower enclosures and any wall that will be regularly soaked. Tile backer board at $75 to $150 is lighter than fibre cement, very stable and carries heavy or large format tiles well. Standard plasterboard installation suits dry rooms, while a wet area needs the specific grades described here.

Using more than one grade in the same room is normal, since the shower walls, the vanity wall and the ceiling each face different exposure. Standard plasterboard has no place anywhere in a wet area, even where tiles and a membrane will cover it, and every sheet carries printed markings on its back face identifying the product and grade. Those markings are only visible for the day or two between the sheets going up and the waterproofer arriving, and walking into the room during that window and photographing the back of a sheet settles the grade question permanently. Before starting bathroom waterproofing, the waterproofer should confirm the substrate is suitable.

Laundries, powder rooms and ensuites follow the same logic with different exposure levels, and a laundry tub and washing machine wall needs wet area grade even where no shower exists. Ceilings above showers collect condensation and deserve water resistant board at minimum. Splashback and floor detailing for laundry tiling follow the same substrate rules.

Fixing, Noggings and Flat Walls

Wet area sheeting is fixed at spacings set by the manufacturer and by AS 2589, which covers the installation of gypsum linings, and stretching those spacings to save time allows the sheet to flex under the weight of tiles and adhesive. Noggings between studs support every sheet edge that does not land on a stud, and joints left unsupported crack tiles and tear membranes later. Stud spacing may need tightening where heavy stone or large format porcelain is planned. Fixings should be the corrosion resistant type specified for the product instead of whatever screws are in the van. Where the framing needs attention before sheeting, carpentry services can straighten studs and add noggings.

Large format tiles need genuinely flat walls, because any bow or twist shows up as lipping between tiles that adhesive cannot hide. Older hardwood framing in Adelaide homes has often moved over the decades and may need packing, planing or replacing in places. Raise the intended tile size before sheeting starts so the framing can be corrected at the right stage. A small gap left at the floor stops the sheet wicking moisture up from a wet screed or slab.

Cut outs around taps, shower roses, mixers and wastes should be neat and close fitting, as the waterproofer has to seal around every one. Oversized or ragged holes make that sealing far less reliable. Joints between sheets are set with wet area compounds, not the standard ones used in dry rooms, and internal corners need proper treatment because that is where the membrane is most stressed. Good tilers will inspect the substrate before starting and raise any concerns.

Masonry Walls in Older Adelaide Homes

Bathrooms in villas, cottages and bungalows often sit against solid stone or double brick external walls, sometimes with a bathroom added into a former sleepout or lean to. Those walls may carry salt damp, old lime render or layers of paint over failed plaster, and stripping the existing render at $25 to $65 a square metre usually reveals the true condition. Salt damage tends to extend well above the visible staining. The decision about battening or re rendering is best made once the wall is exposed and assessed.

Battening creates a flat new plane and a small air gap, and it suits walls that are uneven or still carry some moisture. Re rendering keeps the room its full width and suits straight walls that have been treated and dried. Hard cement render over lime mortared stone can make moisture problems worse by stopping the wall breathing, and salt resistant render systems exist for exactly this situation and are worth specifying. Mould on old render or behind existing tiles needs removing properly before any new work, and professional mould removal makes sense where growth is extensive. Salt and moisture in the wall need to be dealt with before either the plasterer or the tiler starts work.

Water Damaged and Salt Damaged Linings

Water damaged wall repair runs $550 to $3,800 depending on how far the damage extends, and visible staining almost always understates it, because water travels along sheets and down framing. Linings should be removed well past the last visible sign of damage, and soft board, corroded fixings and dark or soft framing all indicate sustained wetness.

Salt damage looks different from water damage and needs a different response. White crystalline deposits, powdery or crumbling render and paint bubbling low on a wall usually point to salt rather than a leak from the shower. Replacing the lining without treating the salt simply repeats the damage within a year or two. Water leaks from the shower itself are investigated through leaking shower repair, which should come before any wall is rebuilt. Framing that has decayed from long term moisture is a structural matter and needs replacing, not sheeting over, and mould on the back of removed board shows the problem has been running for some time.

Finding and fixing the source comes before rebuilding, because a new lining over an unresolved leak fails the same way. Ceilings below a leaking bathroom often need attention at the same time. Adjoining rooms may need plaster repairs to ceilings and cornices as well. A contingency for damage found at strip out is realistic on any older bathroom. Asking for a rate per square metre for additional work avoids arguments later.

Where Sheeting Sits in the Renovation

Demolition comes first, stripping the room back to framing or bare masonry so the real condition can be seen, and rough in plumbing and electrical follow, since pipes and cables have to be positioned before anything closes up. Framing correction, noggings and any battening of masonry walls come next, and salt damp treatment, where needed, happens before battening or rendering and needs drying time. Sheeting then goes up, and that is the moment to check grade and fixing. Hidden damage usually first comes to light during bathroom demolition, so allow for it in the budget.

Waterproofing follows the sheeting and must cure fully before tiling starts. Tiling and fit off then complete the room. A plasterer arriving before rough in is finished creates problems for every trade after them. Coordinating the whole sequence is simpler when one builder manages the bathroom renovations from start to finish.

Condensation, Ventilation and Lining Life

A correctly installed wet area lining should last as long as the bathroom itself, and where one degrades within a few years, the cause is usually moisture in the air and not water through the membrane. Cold masonry walls and high ceilings in older Adelaide homes make condensation worse through winter, and an exhaust fan ducted outside and sized for the room is the single most effective fix. Leave any ceiling repairs until extraction has been improved, or the damage will simply return.

Fans that vent into the roof space rather than outside only move the moisture elsewhere, and running the fan after showering instead of switching it off on the way out clears the remaining vapour. Water resistant board on the ceiling costs little and protects the surface where condensation collects first, and opening a window where one exists helps in milder weather but is rarely enough in winter.

Regional Considerations Across South Australia

Inner and older suburbs across Adelaide carry large numbers of stone and double brick homes where salt damp and old render shape every bathroom renovation. Postwar homes in the middle suburbs are more often brick veneer with timber frames, which simplifies sheeting considerably, while newer homes on the outer fringes use framed walls throughout and follow standard wet area practice. The Adelaide Hills bring colder winters and more condensation in bathrooms, and coastal suburbs add salty air that can affect fixings and metal trims. Regional towns across the Barossa, Clare and the Mid North have their own stock of old stone homes with the same salt damp issues found in the city.

Reactive clay beneath slab on ground homes on the plains can crack sheet joints and tiles as the slab moves with the seasons. Flexible jointing and properly supported sheet edges reduce that risk. Laundries converted from old wash houses at the rear of older homes are a common Adelaide situation, often with rough masonry walls and no damp course. Those rooms usually need full preparation before any lining goes on. Plasterers experienced with older homes are listed at plasterers, and asking for examples of similar work is reasonable.

What Wet Area Plastering Costs in SA

Water resistant plasterboard at $42 to $90 a square metre covers most framed bathroom walls and ceilings, and fibre cement at $55 to $115 and tile backer board at $75 to $150 suit showers and heavier tiles. Battening a masonry wall adds $35 to $80 a square metre on top of the sheet, and stripping old linings or render runs $25 to $65 a square metre including disposal.

A full bathroom resheet typically lands between $1,700 and $4,800, and laundries or powder rooms between $850 and $2,600. Water damaged wall repair runs $550 to $3,800 depending on extent. Older homes with salt damp need that treated separately, often at significant additional cost. Framing repair and noggings are usually discovered during the job instead of quoted up front, so a contingency is sensible. Once the lining is complete, shower tiling can go ahead with tile choice and substrate requirements considered together.

What to Look Out For

Check the grade markings on the back of sheets before the waterproofer covers them. Ask whether the walls are framed or solid masonry and how the plasterer plans to handle each. In an older home, make sure salt damp has been assessed before any lining goes back. Be cautious about hard cement render over old lime mortared stone. Confirm noggings and fixing centres are included. Standards for gypsum linings and wet area substrates are published by Standards Australia, and a plasterer should be comfortable explaining which apply.

Raise the intended tile size before sheeting so the walls can be made flat enough. Expect the budget to move if damage is found at strip out and agree a rate in advance. Check the contractor's licence before signing through Consumer and Business Services. Consumer guarantee rights apply alongside any written warranty and are explained by the ACCC, and unresolved disputes can go to SACAT.

How to Get Useful Quotes

Give the room size and say whether it is a bathroom, ensuite, laundry or powder room. Say how old the house is and whether the walls are timber framed, brick veneer, double brick or stone. Mention any visible damage, staining, bubbling paint or crumbling render. State the tile size you plan to use. Say whether waterproofing and tiling are part of the same engagement.

Mention whether the room has an exhaust fan and whether it vents outside. Have each quote name the sheeting grade for each wall, explain how masonry walls will be prepared, state fixing centres, confirm noggings, price framing correction separately and give a rate for damage found at strip out. Ask whether salt damp treatment has been allowed for or excluded. Photographs of the existing walls, especially at floor level, help plasterers judge the job before visiting. Where existing linings only need patching, general wet area plastering may suit better than a full resheet.