If the grout in a new bathroom starts to darken and mould spots appear on the ceiling a few months later, the cause is usually damp. In Cyprus, especially in homes near the coast, the air is humid to begin with. In winter, cold walls collect shower steam too. That is why a lasting bathroom renovation does not start with the tiles. First you plan waterproofing that keeps water out of walls and floors, ventilation that takes steam outside and materials that cope with moisture; the tiles and fittings go on top of those.
Where does the damp in a bathroom come from?
The right fix starts with finding the right source. In a bathroom, moisture usually arrives in one of three ways.
- Hot showers and baths put a lot of steam into the air. If it is not extracted, it condenses on the coldest surfaces: the ceiling, window reveals and the corners of external walls.
- Old pipes, joints, drains and the edges of shower trays can soak the inside of walls and floors without anyone noticing.
- Rain can get in through the roof, a terrace or cracks in an external wall. Low on the walls, rising damp from the ground is also possible.
Many homes in Cyprus are built with hot summers in mind. Winters are short, but cool and wet. Where the heating runs only briefly and the walls are poorly insulated, the inner face of an external wall stays cold, and warm, moist air from the shower turns into droplets when it meets it. That is why window reveals and corners are where mould shows up first in a bathroom.
Spot the signs early
- Black or green spots on the ceiling, in corners and along grout lines
- Blistering or flaking paint, or blown plaster
- Mirrors and windows that stay misted long after a shower
- A musty smell that does not go away
- Swelling along the bottom edges of the vanity unit
- Water marks on the ceiling of the flat below
If you see any of these, repainting only puts the problem off for a few months. The source has to be found first.
Waterproofing: the layer under the tiles that matters most
Tiles are often assumed to be waterproof. Grout is not. In a shower with no waterproofing, the grout and the layers beneath the tiles soak up water over time, and the water moves on into the wall and the floor slab. A good wet-room job pays attention to the following:
- The shower floor is laid to fall towards the drain. Where the drain meets the waterproofing gets its own detail.
- Before tiling, a suitable waterproofing product goes onto the floor and the shower walls. In the shower, wall waterproofing usually runs up close to ceiling height.
- Corners where wall meets floor and points where pipes come through are where waterproofing is under the most strain. Corner tapes and purpose-made pieces are used there.
- Once the waterproofing is finished, it is worth checking it before any tile goes down. A problem caught at this stage is easy to fix.
- Wet areas get water-resistant grout, and baths and worktops get a suitable silicone where they meet the wall.
Ventilation: don't leave the steam indoors
A window is not enough in every season. In winter, nobody wants to leave it open for long after a shower. That is why an extractor fan that vents outside matters in a bathroom.
- The fan should duct the air outside the building. Blowing it into the roof space only moves the problem.
- Models that run with the light and keep going for a while after it is switched off, or that sense humidity, help make sure the steam really leaves.
- A small gap under the door or a vent lets fresh air into the room.
- In a bathroom without a window, mechanical ventilation is a must.
A washing machine in the bathroom adds to the moisture load. If you use a tumble dryer, a vented model's hose should go outside, and a condenser model's water tank needs emptying regularly. Waterproofing the floor under the machine protects the ceiling of the flat below if a hose ever leaks.
Tiles and materials suited to the Cyprus climate
Floor and wall finishes
Ceramic and porcelain tiles suit wet areas, but they only perform as well as the waterproofing and grout beneath them. Large-format tiles mean fewer grout lines, and cleaning gets easier. For the shower floor, choose tiles that stay non-slip when wet.
Grout and silicone
Wet areas get grout that resists water and stains, and inside the shower tougher options such as epoxy grout are worth considering. Silicone is the last line that holds water back along the bath and shower tray, and it needs replacing once it starts to darken.
Drywall, paint and ceiling
If plasterboard is used in the bathroom, choose moisture-resistant boards made for wet rooms. Inside the shower, those boards are protected with waterproofing too. The same rule applies to suspended ceilings. On walls and ceilings, use a washable paint made to resist moisture and mould.
Units and fittings
The vanity unit's carcass should be moisture-resistant, with well-sealed edge banding. A wall-hung unit stays dry underneath. Where the water is hard, choose taps and shower heads with easy-clean surfaces and heads that can be taken off and descaled.
Renew the plumbing too
Old pipes left behind new tiles are the most common reason a new bathroom gets broken open again. Replacing supply and waste pipes, valves and joints during the renovation is one of the smartest long-term spends. If you use a concealed cistern, make sure its access panel stays reachable and the main valves are easy to turn. On the electrical side, sockets, lighting and the extractor in a bathroom must follow the rules for wet rooms. That is a job for a qualified electrician.
What to do if there is already mould
- Find the source. Condensation, a leak or water from outside? The fix depends on the answer.
- Remove the source. Repair the leak, sort out the ventilation, seal cracks in the facade.
- Clean the mouldy surface with suitable products and let the wall dry out completely.
- Where needed, apply an anti-mould primer and a moisture-resistant paint.
Mould affects the air indoors as well. If it has spread over a large area, or damp has worked its way into the wall, it is wise to have a professional look at it.
Planning your bathroom renovation
A bathroom renovation has a set order: strip-out, plumbing and electrics, waterproofing, tiling, fitting and a final check. Every step taken out of order means reopening work already done. At the planning stage, settle these points:
- Shower or bath? A level-access shower fixes the floor fall and the drain position from the start.
- Will the basin, toilet or shower move? Relocating the waste line widens the scope of the job.
- Do the door swing, the unit sizes and the shower screen position work together?
- Is there another bathroom in the house? In a one-bathroom home, think ahead about how you will manage during the work.
- List your storage needs, such as towels and cleaning products, from the start. Drilling into a shower wall later can damage the waterproofing.
- Choose tiles, taps and sanitaryware before work starts. Lead times directly affect the schedule.
After the renovation: small habits
- Leave the extractor running for a while after a shower, or open the window.
- Squeegee the shower glass and tiles. The grout will last longer.
- Leave the bathroom door open for a while after showering.
- Deal with the first dark marks on silicone and grout early.
Let's renovate your bathroom with damp in mind
A damp bathroom can be fixed for good when it is tackled in the right order: the source first, then waterproofing and ventilation, and the finishes last. That is how Oruç Concept approaches bathroom renovation, and the same team handles the drywall and suspended ceilings and interior painting on walls and ceilings. If you would like to look together at where the damp in your bathroom comes from, get in touch for a free site survey.
Photos: Franco Debartolo, iris lavoie, remapstudio, Unsplash
