Waterproofing FAQ
Waterproofing FAQs.
Clear, practical answers about waterproofing, water entry and the right next step before you contact MEL ONE.
Need help with a waterproofing or water-entry problem in Canberra? MEL ONE checks the affected area on site, identifies the cause and confirms the repair work and written quote.
Our service coverage includes Belconnen, Gungahlin, Inner North & City, Inner South, Woden Valley, Weston Creek & Molonglo, Tuggeranong, East Canberra & ACT Localities, Other ACT Localities. View local service information.
9 waterproofing questions
Waterproofing Service Enquiries & Quotes
Service coverage, assessment visits, costs and the information to prepare before booking.
Do you provide waterproofing services in all Canberra suburbs?
The MEL ONE team carries out MEL ONE waterproofing and leak-repair work across Canberra. Tell us your suburb, property type and affected area and our team will promptly outline the next practical step.
Can I send waterproofing photos before arranging a visit?
Yes. Photos are optional: email safely taken wide photos and close-ups of visible joints, drains, thresholds or staining to riley@melonemaintenance.com.au. They help us prepare but do not confirm a concealed leak source. You can arrange an on-site assessment without photos.
What information should a waterproofing quote include?
Our own team inspects the affected area and prepares a written quote covering removal, preparation, sealing or waterproofing, tiling and the agreed finishes. We explain access, protection, the work sequence and the price before starting. Any change identified during the job is discussed with you before the additional work proceeds.
How should I prepare for a waterproofing inspection or repair?
Clear personal items from the affected area where practical, provide access information and keep relevant reports or photos available. Our team explains the preparation before work begins. Do not remove tiles, open walls or disconnect services yourself; leave the agreed removal, protection and preparation to our team.
Can a tenant report a waterproofing issue?
Yes. A tenant can document the symptom, dates, affected area and photos, then notify the landlord or property manager in line with their tenancy arrangements. Access, approval and repair decisions should be coordinated with the property owner or manager.
How much will waterproofing cost?
We price the repair according to the actual area, access, preparation, materials and finishes. Our team checks the site, discusses the result you want and explains the work stages, cost and expected timeframe in the quote, so you can plan the repair with a clear understanding of what is included.
What records should I discuss before bathroom waterproofing work?
Ask what written scope, material information, concealed-stage photos and completion records will be provided for the agreed work. Confirm any project-specific approval or certification requirements before work starts rather than assuming every repair has the same paperwork.
Will MEL ONE’s own team carry out my waterproofing repair?
Yes. Our own professional team carries out the agreed inspection, preparation, waterproofing and finishing work. We explain the repair method, materials and work sequence before starting, and you communicate directly with our team about progress, site access and completion. Your written quote records the work to be delivered at your property.
Do you accept commercial and strata waterproofing enquiries?
Yes. We accept enquiries for all property types, including commercial premises and strata properties across Canberra and the ACT. Tell us the affected area, access restrictions and who can approve the work so the scope can be assessed.
24 waterproofing questions
Leak Symptoms & Repair Scenarios
Find a practical starting point for leaking showers, balcony ponding, damp cupboards and rainwater entry.
What are the common signs of a waterproofing problem?
Common signs include recurring mould, peeling paint, swollen skirting, loose tiles, stained ceilings below a wet area, damp carpet beside a bathroom, persistent musty odours and water appearing after showering or rain. These signs identify an area to investigate; they do not by themselves prove a failed membrane.
How can I tell whether a leak is plumbing or waterproofing?
Our team checks when and where water appears, including shower use, supply and waste connections, surface joints and rainfall. We trace the likely water path and explain the plumbing, sealing or waterproofing repair needed, with preparation and reinstatement planned together in your quote.
Can a leaking shower be repaired without removing tiles?
Sometimes. An accessible seal or joint fault can be repaired without tile removal; a failed concealed membrane or damaged substrate may require removal. MEL ONE checks the leak source and construction on site and confirms any access, repair and retiling work in the written quote.
Can a leak appear away from the water-entry point?
Yes. Water can follow falls, framing, services, cavities and layers beneath finishes before becoming visible elsewhere. The visible stain or mould may therefore be a symptom rather than the original point of entry.
Will mould go away once I reseal the shower?
Not necessarily. Mould needs safe cleaning and moisture control, while resealing only addresses a limited part of a possible moisture pathway. If mould returns, the source of moisture, ventilation and surrounding materials may need further investigation.
Can I keep using the bathroom while a leak is being investigated?
MEL ONE will explain the safest way to use and protect the area while the concern is assessed. Stop using the area where there is an electrical, slip, ceiling-collapse or significant water-entry risk.
Do you need a plumber for every wet-area leak?
Our own team inspects shower leaks and repairs the affected waterproofing, joints and connections. We check supply pipes, wastes and fixtures as part of the repair assessment and include the work needed to address the water path in your plan. Our own team checks the shower base, screen, tiled junctions and drainage connections together, then explains the preparation, repair and finishing sequence before work starts.
Can just the shower be rewaterproofed rather than the whole bathroom?
We provide shower-only repairs and wider bathroom waterproofing. We inspect the substrate and the connection to the surrounding waterproofing, then recommend the repair area and reinstatement needed for your bathroom. We explain the tile removal, junction detailing, materials and finishing work, together with the curing stages before the shower is used again.
When does shower silicone replacement help?
Replacing deteriorated silicone can help where the issue is limited to an accessible movement joint or edge. Silicone renewal does not repair concealed membrane failure, drainage problems, damaged substrates or plumbing faults.
How is a balcony leak different from a shower leak?
A balcony leak can involve rain, drainage, door thresholds, flashing, external wall junctions, surface finishes or membrane details. A shower leak is usually influenced by internal wet-area use, fittings, drainage and enclosure details; the investigation approach should reflect those different water paths.
Why does water pool on a balcony after rain?
Falls, outlet condition and drainage capacity can contribute to ponding. A new coating alone does not correct every drainage or level problem. Describe where water collects and where it appears below, without entering unsafe areas.
Can resealing a kitchen sink fix a wet cupboard underneath?
Only if the water path is the affected surface joint. A leaking supply connection, waste or fitting needs a plumbing repair. Renewing a perimeter seal does not restore water-damaged cabinet material.
Can external water ingress be fixed with sealant alone?
Sometimes a local sealant repair is appropriate for a defined accessible joint, but sealant alone is not a universal solution. External water entry can involve drainage, flashing, cladding, cracks, membranes, roof details or adjacent construction.
Can a roof membrane be locally repaired instead of replaced?
That depends on the existing system, substrate condition, extent of damage and whether a compatible repair can connect to sound material. An isolated patch is not a sound choice merely because the visible stain is small.
How is condensation different from rainwater ingress?
Condensation can arise when moist air meets a cold surface; rainwater enters through an external path. Weather and use patterns help the investigation, but a stain alone cannot identify which is occurring.
Will exterior paint or another sealant layer fix water ingress?
Not necessarily. A vulnerable window junction, flashing, crack or drainage path may need a different repair. The treatment should address the confirmed entry path, not just cover the visible mark.
Does water pooling beside a house need waterproofing or drainage?
If water is collecting against the building, its source and discharge path need assessment. Waterproofing protects the specified construction detail; it does not automatically remove ponding or replace drainage work.
What should I do first if water is actively leaking?
Keep people clear of wet electrical equipment, significant flooding and unsafe ceilings. For immediate danger, move to safety and call 000. For urgent repair assistance, call MEL ONE with the location and visible water path. Our own team will discuss the immediate repair needs and arrange the site assessment. Do not delay contact to take photos.
My roof leaks only in wind-driven rain. What should the quote cover?
Record the affected room, wind direction if known, when the drip starts and whether it continues after rain. We use these details to plan an assessment of accessible roof waterproofing and junctions. The quote should distinguish the inspection from the repair, name the area and preparation included, and explain access and weather conditions. Roof-covering, plumbing or drainage work needs its own confirmed scope; the position of an indoor stain alone does not prove a membrane defect.
The balcony still leaks after the outlet is cleared. Does it need a new membrane?
Clearing an outlet addresses one possible restriction, but does not establish the condition of the falls, thresholds, joints or concealed membrane. Note where water pools, how long it remains and where damp appears below. We assess the accessible details before comparing a local joint repair with opening the tiled area for membrane work. The written scope should explain any removal, preparation and retiling included. Keep photos of earlier repairs with your enquiry.
Rain comes in around a window only when it is windy. Is resealing enough?
We inspect the window perimeter, wall junctions and drainage paths to find the rainwater entry point. Your repair plan sets out the sealing, waterproofing and any window or building work needed. Tell us where the first wet mark appears so we can prepare for the visit. We check how the frame, sill, surrounding wall and sealant meet, remove failed material where required and finish the repaired junctions neatly.
A room smells musty after rain. How should I describe the moisture problem?
Tell us which room smells damp, when the smell appears and whether it follows rain or shower use. We investigate the water-entry details and plan the waterproofing repair. Where drying, moisture testing or mould treatment is needed, we identify the necessary treatment and restoration work and sequence before finishes are restored. We record the affected surfaces and moisture pattern, explain how the source will be treated and plan the drying and finishing stages with you.
The roof leak has been repaired. Can I paint over the ceiling stain now?
Our team checks the leak source and the condition of the affected ceiling before planning drying, damaged-board replacement and painting. We explain the preparation and reinstatement sequence so the surface repair follows treatment of the water-entry source. Keep clear of sagging ceilings and wet electrical fittings, and tell us about these conditions when you contact us.
A retaining wall is damp and leaning after rain. Will waterproofing fix it?
We inspect retaining-wall water entry and plan the waterproofing, drainage and access needed. If the wall is leaning or moving, we arrange the wall-condition and stabilisation work before waterproofing proceeds. Keep clear of an unstable wall and leave excavation to the our team. We inspect the water path, wall junctions and drainage together and explain the preparation, protection and reinstatement required for the chosen approach.
21 waterproofing questions
Waterproofing Knowledge & Materials
Understand membranes, grout, flexible joints, preparation and curing before choosing a repair scope.
What is the difference between waterproof and water resistant?
Waterproof means a building element is intended to resist the passage of water under the conditions required for that location; water resistant is a different level of protection. MEL ONE reviews the area, substrate, building classification and project scope to recommend the correct waterproofing detail for the job.
Do all bathroom floors need the same waterproofing treatment?
No. Waterproofing and water-resistance requirements can differ between shower areas, areas outside showers, baths, laundries and different floor types. Existing buildings, renovations and the proposed scope can also change what needs to be considered.
Why is the wall-to-floor junction important in a shower?
The wall-to-floor junction is a high-risk transition because water can collect and move through discontinuities at the change of plane. The detail must work with the waterproofing system, drainage falls, penetrations and finishes rather than being treated as a cosmetic sealant line only.
What should be checked before waterproofing over an existing surface?
Check the substrate condition, moisture, previous coatings, junctions and compatibility with the selected membrane. Cleaning, repair and levelling come before the waterproofing application; damaged backing is not corrected by covering it.
How long does waterproofing need to cure before tiling?
Use the selected system's instructions and actual site conditions. Tile-over time can differ from full cure and return-to-use time, especially at junctions. Temperature, moisture and coat thickness affect the schedule.
Does cracked grout mean the waterproofing membrane has failed?
No. Cracked or missing grout can be a maintenance issue, but grout is not the waterproofing membrane. It can signal movement, wear or water entry at a joint, so the surrounding condition should be considered before deciding on regrouting or more extensive work.
Is resealing the same as replacing waterproofing?
No. Resealing addresses specified joints, edges or penetrations, while waterproofing replacement involves a different scope beneath the finished surface. A written scope should clearly state which work is included.
Is epoxy grout the same as an epoxy moisture barrier?
No. Epoxy tile grout is a joint-filling product for suitable tiles. An epoxy moisture barrier is a coating used on a substrate within a specified system. Neither name means it replaces every part of a waterproofing assembly.
What is a bond breaker, and is it tile grout?
A bond breaker controls adhesion at a specified joint or membrane detail so movement can be accommodated. It is not grout for filling fixed tile joints. The selected waterproofing system determines the required joint treatment.
Can surface sealing replace a balcony waterproofing membrane?
No. A surface treatment or local joint repair has a different role from the membrane beneath finishes. Water reaching a room below may require investigation of the membrane, thresholds, flashings and drainage before choosing the repair.
Is ground-level paving the same as a balcony over a room?
No. An elevated balcony may form part of the weatherproof enclosure over occupied space, with thresholds and membrane junctions to consider. Ground-level paving can involve a different drainage and construction problem.
What needs checking before laundry floor tiling?
Review the substrate, drainage, penetrations and floor-to-wall junctions before they are covered. Confirm the waterproofing scope for the particular floor and room rather than assuming the bathroom detail applies unchanged.
Is roof painting the same as roof waterproofing?
No. Roof paint is not automatically a repair for a failed membrane, flashing, penetration or outlet detail. The water path and existing roof assembly determine whether waterproofing, roofing or drainage work is appropriate.
Where are sheet waterproofing membranes used?
There are sheets for exposed roofs, internal under-tile wet areas and below-ground structures, but they are different systems. Select by exact product, substrate and exposure. For example, an APP roof cap sheet is different from a dedicated under-tile sheet. Seams, corners, outlets, fixing and protection are part of the specification; a roll of material alone is not a complete waterproofing system.
Can PVC or TPO roof membrane be used in a shower?
A roofing designation does not establish under-tile wet-area suitability. PVC and TPO are different material families, and roof, basement and under-tile products have different build-ups and joint details. Use a product explicitly documented for the intended wet-area substrate and tile finish, with its compatible adhesive and outlet details. The polymer name is not a substitute for the specific system instructions.
Where is polymer-modified cementitious waterproofing usually used?
These systems are commonly considered for concrete, render and masonry. Particular products are documented for wet-area tiling, underground walls or immersion, and some systems suit negative-side water pressure. The proposed product is checked against the substrate, movement and exposure, together with its specified preparation, thickness, joint treatment and curing.
Can a water-based waterproofing membrane be used outside?
Some products can, subject to their documented external use, substrate and covering requirements. Water-based describes the carrier, not the exposure rating. An external under-tile membrane may still need tiles or another specified cover and may not be suitable as an exposed roof finish. Confirm UV exposure, ponding, immersion and traffic separately rather than assuming all outdoor conditions are equivalent.
Does polyurethane waterproofing need a UV-resistant topcoat?
It depends on the exact product and complete exposed-roof system. Some polyurethane base membranes require a specified protective topcoat; others have different exposure instructions. Sikalastic-488 and the SikaRoof MTC-12 UV build-up illustrate why the base membrane and the whole system must be distinguished. Confirm the nominated layers and maintenance requirements instead of treating every PU coating as a finished roof surface.
Is an epoxy moisture barrier the main flexible waterproofing membrane?
Not automatically. A product such as ARDEX WPM 300 has specified primer and barrier roles, including certain moisture and pressure conditions. Its position in the selected build-up needs to be stated. It is different from epoxy tile grout and does not automatically replace the flexible membrane, joint detailing or compatible tiling system required for the wet area.
Does two coats prove the correct waterproofing thickness?
Coat count alone is not enough. Liquid membranes have product-specific coverage and wet or dry film requirements, together with preparation, detailing and cure conditions. A sheet has a manufactured thickness, but its seams and terminations still need the specified installation and checks. The quote and records should identify the selected system and relevant checks, not a universal number of coats or drying hours.
Can balcony waterproofing be used for a pool or retaining wall?
We select waterproofing systems for the application, including balconies, pools, tanks and retaining walls. For permanent immersion or water pressure, we check the exact product, substrate, joints, protection and drainage requirements together before specifying the installation. Our team specifies the primer, membrane, junction accessories and protective finish as a connected system, with preparation and curing planned for the actual location.