Washroom Sealing in Cosham
Sealing in commercial washrooms, showers, kitchens and wet areas in Cosham and across Portsmouth. CHAS accredited and fully insured, with a 12-month guarantee.
- A new bead over an old one coming away
- Discoloured joints around urinals and WC pans
- Mould spotting along silicone joints
Need washroom sealing in Cosham?
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
How we handle washroom sealing in Cosham
Our washroom work covers offices, hotels, schools and colleges, leisure centres and gyms, clinics and care homes, plus the kitchens and tea points that go with them. The products and the method are chosen for how heavily each space is used. Most enquiries involve mould spotting along silicone joints and panel joints letting water behind, on vanity units and basins, accessible toilets and changing rooms and IPS panels and cubicles. Searching for sealant specialists in Cosham? We’ve been sealing commercial buildings since 2005, CHAS accredited and a Constructionline member.
Pub and restaurant kitchens around smaller places like Cosham work hard on their joints. Smooth, sealed joints at worktops, sinks and wall cladding make cleaning easier.
The 12-month guarantee is for workmanship rather than wear and tear. How long a sealant joint lasts depends on movement, exposure, cleaning and use, so we’re clear about what is covered before work starts.
- Where
- Cosham (PO6, PO3, PO2)
- Region
- Portsmouth
- Guarantee
- 12 months on our workmanship
- Quote
- A fixed quote before we start
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
For managing agents and facilities managers
Facilities managers want contractors who arrive with the paperwork sorted. Tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we’ll confirm with the quote.
For main contractors, we work as the sealant subcontractor. Programme, specification and site rules come first.
Towns and villages near Cosham
Other services in Cosham
Common questions from Cosham clients
Is Cosham off your patch?
No. Places such as Cosham are covered as much as the big towns. We work across Greater London and the South East. Send photographs and a list of what needs doing, and we’ll plan the job to need as few trips as possible.
Will you plan work around the academic year at somewhere like University of Portsmouth - Langstone Campus?
Yes, holiday working periods are the norm on campus jobs. Let us know which documents your site asks for, and we will confirm them alongside the quote.
Do you use special sealant for toilets and showers?
Sanitary silicone with anti-mould additives in most cases. Neutral-cure grades are used where acetoxy types could mark metals, stone or mirror backings.
Are you CHAS accredited?
Yes. Mastic Doctor is CHAS accredited and a Constructionline member, which helps with supplier vetting.
Does weather matter for sealant work?
Outside, yes. The joint has to be dry and within the product’s temperature range, so frost, rain or cold mornings can delay outside work. Inside work is seldom held up.
Can you clean the mould off instead of resealing?
Not for long. The mould is inside the silicone, so it comes back however often it’s cleaned. Replacing the bead is the lasting answer.
Is it OK to put new silicone on top of the old?
The failed bead is always removed. New silicone won’t stick to the old so a bead over the top fails quickly.
Washroom sealing around Cosham: what changes locally
The sea is no more than about 1 mile from Cosham, and coastal places often have hotels, guest houses and holiday accommodation with busy seasons. Showers and en suites in constant use are where silicone moulds and splits first, which is why off-season resealing makes sense. Cosham is about 62 miles from central London, within the office belt around the capital. Office toilets in the commuter belt are in use from first arrivals to last departures, which is why the work is phased.
Healthcare estates like Queen Alexandra Hospital (to the north of Cosham) expect contractors to follow their permits and cleaning rules in every washroom. At a college such as Portsmouth College, which lies south of Cosham, washroom and kitchen sealant is best renewed in the holidays or in phases during term.
Cosham is about 2 miles south-west of Purbrook, in Portsmouth. Anywhere in PO6, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. Cosham is one of 19 places we cover in Portsmouth.
Anyone looking for washroom sealing in PO6, PO3 and PO2 gets the same process as the rest of our area: details, then a fixed price, then sealing and a 12-month guarantee. We cover commercial and managed buildings on Dean Road, Park Lane and Elgin Road. You’ll find Cosham on or near the A397, so getting applicators and materials to site is simple. Close to Cosham, our area also takes in Wymering (1 mile north-west), Hilsea (1 mile south), Drayton (1 mile east), Widley (1 mile north-east) and Paulsgrove (1 mile west). Further afield, our area takes in Southsea (4 miles south), Milton (3 miles south), Landport (3 miles south), Portsea (3 miles south-west), Portsmouth Point (4 miles south-west) and Fratton (3 miles south).
Local landmarks in Cosham
Around Cosham, our work takes us to commercial buildings near The First Post pub, Alexandra Park and Springfield School. There’s a railway station in Cosham itself: Cosham station. Nearby you will also find Tricorn Centre (2.9 miles south) and World War I Remembrance Centre (1 mile south-east). For a walk, there’s Southmoor Nature Reserve and Portsdown Hill.
When to bring in a specialist
The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are where general trades tend to cut corners.
Certain joints really need a specialist: for example fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. A poor seal in places like these tends to cost more to put right later.
Keeping the joints sound
Every sealant joint needs some looking after, and their life depends on movement, exposure, cleaning and use. We suggest:
- Tell us about infection-control or permit rules before we quote
- Include joints in routine washroom inspections
- Clean sealant with gentle products and a soft cloth
- Leave signs up until the cure time is over
Ventilation is half the battle. A room that stays damp will grow mould on almost anything so report fans that aren’t working to your building services team.
Inspectors look at whether kitchen surfaces can be kept clean. Resealing sinks, worktops and splashbacks before an inspection is a simple step.
Why it’s worth doing now in Cosham
Cleaning mouldy sealant only masks it, but the mould is rooted in the silicone and comes back. A full reseal deals with it and your cleaning team stops chasing it. Over time, UV, weather and movement wear any sealant out. Renewing it in good time keeps the building weathertight.
No two sites price the same: the joint sizes, the specified product, access and working hours each have a bearing. A fixed quote follows once we understand the job.
Why choose Mastic Doctor in Cosham
- Fixed quotes based on photos, drawings or a visit
- Colours chosen to suit frames, cladding or finishes where possible
- Products installed to the manufacturer’s instructions
- Work carried out by CSCS-carded applicators
Read how commercial sealant jobs are priced or how we’re accredited.
Do you need washroom sealing in Cosham?
Washrooms are warm, damp and full of organic residue, and silicone joints hold onto all three. Even anti-mould grades can be colonised over time where extraction is poor.
These are often picked up first by site or facilities staff:
- Kitchen worktop joints that can’t be kept clean
- Resealing that didn’t last because the old bead stayed
- Open joints along basins and vanity units
- Failed joints along IPS and cubicle panels
Student showers at universities like University of Portsmouth - Langstone Campus, 3.4 miles south of Cosham, see more use than most, and their silicone shows it.
What to look for in a quote
- How the existing material will be dealt with
- Will CSCS-carded applicators be on site?
- How the joint faces will be prepared and primed
- Their pre-qualification and accreditations
Diagnose, treat, sign off
We follow your site rules from the start: sign-in, induction and whatever permit system the building uses. Once we are cleared to begin, the joints are worked through in the order agreed with your site contact, and each area is checked before we leave it. Several jobs near Cosham can be grouped on one trip. Mention the building’s opening times and we will work within them.
- We agree which washrooms close and when.
- Anything behind the joints that needs another trade is flagged.
- Old sealant is stripped and the faces prepared.
- We reseal with the grade suited to each area.
- We give you a reopening time for every room.
What we need from you
- Let us know about inductions and permits
- Make sure the joints can be reached
- Point out parking and an unloading spot
Ask for a quote
If there’s a specification, drawings or a tender package, send it with your enquiry, and we will price the work to it. Smaller jobs need nothing more than photographs and a few notes.