How to get 25 years out of a Pakenham bathroom.
A well-built bathroom that is never maintained still fails early. A well-built bathroom with about ninety minutes of attention a year lasts a quarter of a century. The list is short, most of it is free, and almost nobody does it. Here is the whole thing.
What to do the week the job finishes.
A new bathroom is not finished on handover day; it is still curing. Cement grout takes about seven days to reach full cure, and during that window it is soft, porous and vulnerable to exactly the cleaning products people reach for when they want the new room to sparkle. So for the first seven days: water and a soft cloth, nothing else. No acidic bathroom sprays, no bleach, no scrubbing pads. Silicone needs about 24 hours before it sees water at all, which is why we ask you not to use the shower the day of the final seal even though it looks done.
If you have a natural stone benchtop - and since the July 2024 engineered stone ban, natural stone and porcelain slab are what we are installing - it gets sealed on handover and wants resealing on the manufacturer's cycle, usually every one to two years depending on the stone. The test is simple: drip water on it, and if it darkens within a few minutes rather than beading, it is time. Do that test annually and ignore the calendar.
Then read your handover pack once and file it somewhere you will find it in fifteen years. The AS 3740 waterproofing certificate, the plumbing Compliance Certificate, the Certificate of Electrical Safety, the Domestic Building Insurance certificate, and the dated membrane photos. Scan the lot. That pack is worth more than any fixture in the room at claim time and at sale time, and we explain exactly why on our bathroom insurance page.
Silicone is a consumable. Treat it like one.
Bathroom silicone should be replaced every 5 to 8 years, and it should be raked out completely and re-run, not smeared over the top of the old bead. Silicone is a consumable, not a permanent seal - it is the one component in the room specifically designed to be replaced, because it sits at exactly the junctions that move. It loses adhesion at one edge long before it looks bad, so do not wait for it to go black. A full re-seal of a standard bathroom - shower base to wall, wall internal corners, vanity to wall, bath rim - runs about $380 done properly with the old bead cut out, the joint cleaned back to bare substrate, and a neutral-cure sanitary-grade silicone run in one pass. It is the cheapest insurance in the house and it is the single most skipped job in Australian homes.
Why those junctions specifically? Because they are the movement joints, and in Pakenham that is not theoretical. Most of the Cardinia growth estates sit on reactive clay classified Class M to H1 under AS 2870, with pockets running to H2 on the Toomuc Creek flats and in the deeper estate fill. Your slab lifts through a wet winter and drops back through a dry February, every year. The silicone at the wall-floor internal corner is what absorbs that cycle. When it perishes and nobody replaces it, the joint has nothing flexible in it, and the next thing to take the movement is the grout - which cracks, and then water starts moving through the bed. That is the whole failure chain, and it starts with a $380 job nobody did.
The 20-minute rule is the best free thing you can do.
The exhaust fan should run at least 20 minutes after the last person gets out, and it should be discharging outside rather than into the roof cavity. This is the most valuable free thing you can do for a bathroom. A shower puts a surprising volume of water into the air, and if that air is still sitting in the room an hour later it condenses on every cold surface - the back of the vanity kick, the underside of the bottom drawer, the wall behind the mirror cabinet. That is what swells a vanity carcass from the bottom up and turns a 25-year cabinet into a 12-year one. A timer switch that overruns the light by 20 minutes costs about $180 fitted by an A-grade electrician and removes the human factor entirely. If your fan vents into the roof space, you are not ventilating - you are relocating the problem into your ceiling.
That last sentence is worth taking seriously, because it is extremely common in the estate builds we work on. A ducted fan that terminates in the roof cavity rather than at an eave or roof vent is dumping every shower's worth of moisture into your insulation and onto the underside of your roof sheet. In a Pakenham winter, with overnight minimums around 5 to 6 degrees, that moisture condenses on the cold steel and rains back down onto the ceiling plaster. Homeowners spend years chasing a "roof leak" that is actually their bathroom fan. If you have never checked where yours goes, put your head in the manhole on a cold morning and look. It takes two minutes.
Squeegee the shower screen after use if you can be bothered - it genuinely doubles the life of the glass coating and cuts the soap residue that eventually packs the channel and drops the door. And once a year, pull the hair out of the floor waste properly rather than poking at it. A partially blocked waste means water sits on the floor longer after every shower, which is exactly the condition your falls and membrane were designed to avoid.
Acid, abrasives and bleach: the three things to stop using.
Do not use anything acidic, anything abrasive, or bleach on silicone. Acidic cleaners - the ones sold for lime scale and soap scum - will etch natural stone benchtops permanently and will slowly eat the cement in your grout, opening it up to exactly the water movement you are trying to prevent. Abrasive creams and pads scratch the glaze on porcelain and dull chrome tapware. Bleach on silicone breaks it down and shortens its already short life, and the black you are trying to kill is usually growing under the surface where the bleach cannot reach anyway. Use a pH-neutral cleaner and a soft cloth for almost everything, and for the first seven days after handover use nothing but water while the grout completes its cure. That is the whole list.
On grout sealing: modern grout in a properly waterproofed bathroom does not structurally need sealing, and this is worth being clear about because it gets oversold. The membrane under the tile is what keeps water out of the building - grout is not a waterproofing layer and never was, so sealing it does not make your bathroom waterproof and a failed membrane is not rescued by a grout sealer. What sealing does do is genuinely useful at the cosmetic level: it slows staining and makes the grout much easier to keep clean, which matters most on light-coloured grout in a family bathroom. If you want to do it, use a penetrating sealer, wait the full grout cure of about 7 days first, and reapply every couple of years. Treat it as a cleaning aid, not as protection.
Ninety minutes a year against $19,700.
The one maintenance job Pakenham homeowners forget is replacing the braided flexi hoses under the vanity. Most manufacturers nominate around five years of service life, and the failure mode is the stainless braid corroding and unzipping under constant mains pressure - which delivers roughly 1,500 litres an hour into your house until someone finds the stop tap. In the 1998-2015 Cardinia estate builds we work in every week, we routinely find original hoses at fifteen and twenty years old, still under full pressure, quietly waiting. A pair costs under $200 fitted during any other plumbing visit. This is also the one bathroom failure your home insurance actually does cover, because it is sudden and accidental - but the excess, the disruption and the ruined flooring make prevention a much better trade than a claim.
So here is the full maintenance ledger for a standard Pakenham bathroom over twenty-five years. Silicone re-seal at $380, four times across the period: $1,520. Flexi hoses at $200, five times: $1,000. A fan timer switch fitted once at $180. Stone sealer, DIY, roughly $40 every couple of years: $500. Annual tap test and waste clean-out: free, about ninety minutes a year of your own time. Grand total across twenty-five years: about $3,200, or $128 a year.
The alternative, which we quote most weeks, is the full rebuild that arrives at year eight or nine when none of that was done: strip-out and skip $1,900, new AS 3740 membrane with certificate $780, screed and corrected falls $1,150, retile 24 square metres at $150 per square metre fitted $3,600 plus $1,450 of tile, frameless screen $1,600, plus vanity, tapware, second-fix and labour - $18,400, and $19,700 once the wet bottom plate and two studs are replaced. That is the actual return on ninety minutes a year. The full rate card is in our 2026 price guide, the tells to watch for are on our warning signs page, and the membrane work behind it all is under bathroom waterproofing. The component-by-component wear curve this ledger is built on is on our bathroom lifespan page.
Maintenance questions we get asked.
How often should bathroom silicone be replaced?
Every 5 to 8 years, and it should be raked out completely and re-run, not smeared over the top of the old bead. Silicone is a consumable, not a permanent seal - it is the one component in the room specifically designed to be replaced, because it sits at exactly the junctions that move. It loses adhesion at one edge long before it looks bad, so do not wait for it to go black. A full re-seal of a standard bathroom - shower base to wall, wall internal corners, vanity to wall, bath rim - runs about $380 done properly with the old bead cut out, the joint cleaned back to bare substrate, and a neutral-cure sanitary-grade silicone run in one pass. It is the cheapest insurance in the house and it is the single most skipped job in Australian homes.
How long should the exhaust fan run after a shower?
At least 20 minutes after the last person gets out, and it should be discharging outside rather than into the roof cavity. This is the most valuable free thing you can do for a bathroom. A shower puts a surprising volume of water into the air, and if that air is still sitting in the room an hour later it condenses on every cold surface - the back of the vanity kick, the underside of the bottom drawer, the wall behind the mirror cabinet. That is what swells a vanity carcass from the bottom up and turns a 25-year cabinet into a 12-year one. A timer switch that overruns the light by 20 minutes costs about $180 fitted by an A-grade electrician and removes the human factor entirely. If your fan vents into the roof space, you are not ventilating - you are relocating the problem into your ceiling.
Do I need to seal the grout in a new bathroom?
Modern grout in a properly waterproofed bathroom does not structurally need sealing, and this is worth being clear about because it gets oversold. The membrane under the tile is what keeps water out of the building - grout is not a waterproofing layer and never was, so sealing it does not make your bathroom waterproof and a failed membrane is not rescued by a grout sealer. What sealing does do is genuinely useful at the cosmetic level: it slows staining and makes the grout much easier to keep clean, which matters most on light-coloured grout in a family bathroom. If you want to do it, use a penetrating sealer, wait the full grout cure of about 7 days first, and reapply every couple of years. Treat it as a cleaning aid, not as protection.
What should I not use to clean a new bathroom?
Anything acidic, anything abrasive, and bleach on silicone. Acidic cleaners - the ones sold for lime scale and soap scum - will etch natural stone benchtops permanently and will slowly eat the cement in your grout, opening it up to exactly the water movement you are trying to prevent. Abrasive creams and pads scratch the glaze on porcelain and dull chrome tapware. Bleach on silicone breaks it down and shortens its already short life, and the black you are trying to kill is usually growing under the surface where the bleach cannot reach anyway. Use a pH-neutral cleaner and a soft cloth for almost everything, and for the first seven days after handover use nothing but water while the grout completes its cure. That is the whole list.
What is the one maintenance job Pakenham homeowners forget?
Replacing the braided flexi hoses under the vanity. Most manufacturers nominate around five years of service life, and the failure mode is the stainless braid corroding and unzipping under constant mains pressure - which delivers roughly 1,500 litres an hour into your house until someone finds the stop tap. In the 1998-2015 Cardinia estate builds we work in every week, we routinely find original hoses at fifteen and twenty years old, still under full pressure, quietly waiting. A pair costs under $200 fitted during any other plumbing visit. This is also the one bathroom failure your home insurance actually does cover, because it is sudden and accidental - but the excess, the disruption and the ruined flooring make prevention a much better trade than a claim.
Service areas across Cardinia.
Past the silicone stage? Get it looked at properly.
Whether it is a $380 re-seal or something that needs a real scope, we will tell you which - and we would rather tell you it is the $380 one. Email quotes@pakenhambathroomrenovations.com.au.