Expansion Joint Sealing in Cosham
Commercial sealant work in Cosham for contractors, FMs and building owners: expansion and movement joint sealing in walls, decks and floors, with a fixed quote first.
- New sealant over old, now failing
- Leaks through car park deck joints onto the level below
- Movement joints with split or torn sealant
Expansion joint sealing for businesses in Cosham
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
From enquiry to sign-off
Working in a building that stays open takes some planning. We sign and contain the area we are in, keep walkways clear and move on in phases so staff and visitors can carry on around us. For a job in Cosham, the main thing is a clear picture of the work. You will then get a fixed price for the work.
- The first job is to check each joint: how wide it is, how it moves and why the old seal let go.
- Next, we fix a price and confirm the sealant we propose for the movement.
- Old sealant and filler are cut out and the joint faces cleaned back to sound material.
- We control the depth with backing rod or, in shallow joints, bond-breaker tape.
- After any primer the maker requires, the bead is applied and tooled so it grips two sides only.
- Finished joints are checked and backed by our 12-month guarantee.
Preparing the site
- Point out any areas we must not close
- Send your site hours and access windows
- Point out parking and an unloading spot
Request a quote
Every quote starts with the facts: the joints involved, quantities, access and the product called for. Share whatever details you have and we will fill any gaps with a visit.
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Expansion joint sealing in Cosham
Mastic Doctor has sealed movement joints since 2005 for contractors, facilities managers and owners. CHAS accredited, Constructionline member, CSCS-carded applicators and five million pounds of public liability insurance. Each job is backed by a 12-month guarantee on the workmanship. We work on brickwork movement joints, cladding panel joints and podiums and floor movement joints, and the failures we are asked to look at most are sealant peeling off one face of the joint and water dripping through deck or ramp joints. Looking for mastic applicators who cover Cosham? We’ve been sealing commercial buildings since 2005, with CSCS-carded applicators.
Around Cosham, most floor and movement joint jobs are single buildings or yards, so we gather photographs and measurements first. That way the right materials come on the day and the job is done in one visit where possible.
What our 12-month guarantee covers is the way we did the job: the preparation, the sealing and the tooling. Damage, later alterations by others and movement beyond what the joint was designed for sit outside it.
- Where
- Cosham (PO6, PO3, PO2)
- Wider area
- Portsmouth
- Cover
- A 12-month guarantee
- Price
- A fixed quote before we start
- Call
- 01277 525 020
- Last updated
- 3 November 2026
How the job changes by surface
Brickwork and blockwork joints
Mortar snots and debris in the joint stop it working. We clear the joint fully before sealing and flag any joint that seems undersized.
Car park decks and ramps
Water coming through deck joints is the usual first sign. We strip the old seal, prepare the edges and seal again.
Signs you need expansion joint sealing in Cosham
Car park decks and floors face loads that walls never see. Wheel loads stress the sealant and the arrises, while grit and salts work into any gap. A sealant that isn’t trafficable won’t last there.
Common reasons buildings call us in:
- Rain penetration at brick or block movement joints
- Chipped joint edges on forklift routes
- Hardened, cracked sealant on exposed facades
- Torn sealant in brick or block movement joints
Retail centres such as Victory Retail Park, 2.6 miles to the south of Cosham, have floors, service yards and car parks with joints under constant traffic.
Comparing quotes
- How the joint faces will be prepared and primed
- How joint depth will be controlled
- How they’ll work around occupants
- Will RAMS and insurance details be available?
Also near Cosham
Other services in Cosham
After the work
Cleaning and maintenance staff play a part too. Pass these on to them:
- Sweep decks, ramps and floors so grit doesn’t collect in the joints
- Raise snow-clearing blades over deck joints where possible
- Treat a small split as a warning, not a cosmetic issue
- Reopen bays and walkways only after the stated cure time
In warehouses, forklift and pallet-truck routes take the most wear. Avoid standing heavy loads or racking legs on the joints.
An open joint fills with grit, and a joint full of grit can’t close. The arrises crack and break away under the load, turning a sealant job into a repair job. Keeping the seal sound avoids all of that.
Cosham: questions and answers
Do you cover business parks and estates near Cosham, such as Oak Park Industrial Estate?
Yes. Estates, retail parks and business parks around Cosham, Oak Park Industrial Estate among them, are all within reach. Photos and a short description are enough for a first look.
Is a hospital such as Queen Alexandra Hospital somewhere you can work?
Yes, provided the work is planned with the site’s estates team. We follow the site’s permits, sign-in and infection-control procedures in every area.
Are your applicators CSCS-carded?
Yes. Should the site need card details in advance, let us know and we’ll send them with the quote.
Will you come and look before quoting?
That depends on the size and complexity of the job. Straightforward work can often be priced from photos and measurements, and bigger or more complex jobs typically get a visit.
How long do sealant joints last?
Nobody can honestly give a figure in years, because life depends on how much the joint moves, how exposed it is and how it’s cleaned and used. Regular inspection is the best way to catch problems early.
Do you take on small jobs?
Single areas, one-off repairs and whole buildings are all quoted the same way: details, then a fixed price, then sealing, then a 12-month guarantee.
How soon can the area be used again?
Curing time varies by product, and we confirm it on the day, and flag anything to keep off until it has cured.
Expansion joint sealing in Cosham: the local picture
Cosham is within about 1 mile of the coast. Coastal yards and decks give their joints salt and wet weather to deal with, not just wheels, and edges left open tend to break up faster. Rainfall across the South East, Cosham included, is lower than in many parts of the UK. External joints still wait for dry conditions, and where de-icing salt is spread in winter, open joints let it in.
Estates like Oak Park Industrial Estate, 0.7 miles west of Cosham, combine warehouse slabs, yards and loading bays, all with joints under wheels. For estates staff at a university like University of Portsmouth - Langstone Campus, 3.4 miles south of Cosham, building and paving joints are part of the planned maintenance list.
Cosham is about 2 miles south-west of Purbrook, in Portsmouth. Cosham sits inside our coverage and the rest of Portsmouth, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. Cosham is one of 19 places we cover in Portsmouth.
Anyone looking for expansion joint 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. Among the streets we cover are Dean Road, Park Lane and Elgin Road. Cosham sits on or close to the A397, useful when we plan access and materials. Just outside Cosham, we also work in Wymering (1 mile north-west), Hilsea (1 mile south), Drayton (1 mile east), Widley (1 mile north-east) and Paulsgrove (1 mile west). Nearby towns on our patch include 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 and the streets around them. Cosham has its own railway station: Cosham station. Well-known places in the area include Tricorn Centre (2.9 miles south) and World War I Remembrance Centre (1 mile south-east). The countryside around Cosham includes Southmoor Nature Reserve and Portsdown Hill.
Building owners, agents and FMs in Cosham
As a CHAS accredited contractor and Constructionline member, we’re straightforward to vet for your supplier list. We’re fully insured, and our insurance certificate can go with the quote.
Blocks and communal areas make up much of the work for housing associations and agents. Work can be phased so residents and staff keep access throughout, with each stage agreed with your site contact.
What affects the price in Cosham
A fixed quote reflects the actual work. It takes account of:
- Quantities, in metres or numbers
- The size and state of each joint
- How much existing material needs removing
- Phasing around occupants
What a job costs comes down to the quantity of joints, how much old material needs removing and the access. Call for a quote once you have the details.
Sending details for a quote
The more we know, the firmer the quote. When you get in touch, include:
- Drawings or a marked-up plan, if available
- Asbestos survey details if the building is older
- A wide shot and a close-up of the area
- Access details, including height
If there’s a specification, drawings or a tender package, send it with your enquiry, and we will price the work to it. For smaller jobs, photographs and a description will do.