Expansion Joint Sealing in Portchester
Expansion and movement joint sealing in walls, decks and floors in Portchester and across Hampshire. CHAS accredited and fully insured, with a 12-month guarantee.
- Sealant pulling off the joint face
- Rain penetration at brick or block movement joints
- Movement joints with split or torn sealant
Expansion joint sealing for businesses in Portchester
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Looking after the joints
Sealant joints are maintenance items, and their life depends on movement, exposure, cleaning and use. We suggest:
- Look over external and deck joints after a hard winter
- Brief car park operatives to protect joint lines during winter clearance
- Reopen bays and walkways only after the stated cure time
- Treat a small split as a warning, not a cosmetic issue
On car parks, winter clearance can damage deck joint sealant. Lifting the blade at each joint avoids tearing the bead, and it’s worth checking joints once the cold weather has passed.
On a multi-storey car park, a failed joint typically shows up as a leak onto the deck underneath. Salty water dripping through stains soffits and lands on parked vehicles. Sealing the joint promptly stops it at source.
Expansion joint sealing in Portchester
A movement joint only works while its seal does. When the sealant splits or lets go, the gap fills with dirt and water. Dealt with early, it stays a sealant job rather than a concrete or masonry repair. If you have previous reseals laid over old sealant and joints packed with grit and debris, we can put it right, on podiums and floor movement joints, precast concrete panel joints and brickwork movement joints alike. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, in Portchester it comes down to the same thing: the right product in a properly prepared joint.
Around places the size of Portchester, joints that need sealing tend to be in rural business units, farm buildings put to commercial use, schools and community buildings. Concrete floors and yards in these buildings move and crack like any others.
Our 12-month guarantee is about workmanship, not wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we’re clear about what is covered before work starts.
- Where
- Portchester (PO16, PO6, PO17)
- Region
- Hampshire
- Cover
- A 12-month guarantee
- Price
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
Common questions from Portchester clients
Is Portchester off your patch?
No. Places such as Portchester are covered as much as the big towns. Our area covers London and the South East counties. We plan jobs in smaller places so return trips are kept to a minimum.
Can you work at a site such as Castle Trading Estate, by Portchester?
Yes. We cover Portchester and the area around it, including industrial estates, business parks and retail parks such as Castle Trading Estate. To start, just give us a call on 01277 525 020 or email drawings and photos with the unit, the joints involved and your access times.
Is movement joint sealing guaranteed?
The 12-month guarantee applies to the workmanship. Tell us straight away if a joint we sealed gives trouble in that time.
How long does movement joint sealing take?
Allow a short visit for a handful of joints, or several days or more for a car park deck or long runs of facade joints. Timings are set out in the quote along with the phasing plan.
How do you deal with asbestos in old sealant?
Some older mastics, especially in pre-2000 buildings, can contain asbestos. We check the asbestos register before cutting out old sealant in an older building, and if asbestos is suspected, work stops until it’s tested. Removing asbestos is a job for asbestos specialists, not us.
Can you work to our specification?
Yes. We follow the specification, along with the manufacturer’s installation guidance, and any queries are raised before we start.
How long do sealant joints last?
There isn’t a single answer, because life depends on how much the joint moves, how exposed it is and how it’s cleaned and used. Regular checks let you plan resealing before leaks or damage.
Places near Portchester
More services for Portchester
Leave it or put it right?
Re-sealing with the same product that failed is often a false economy. A higher movement class, or a design change by the engineer, may be needed and we will tell you honestly. A failed joint lets water into a building whatever its size. Early resealing avoids the damage that follows a leak.
Larger quantities, tricky access or phasing all shape the price. So do site requirements such as inductions and permits.
Why choose Mastic Doctor in Portchester
- Old sealant cut out, never sealed over
- Specification-led, product-correct work
- One number for every site we cover
- Clear, fixed quotes
Take a look at what affects the cost or our accreditations and insurance.
What sealant work can’t fix
We check first that sealant really is the fix. It isn’t the answer for:
- Damaged metal nosings or cover plates over a joint
- Concrete or masonry repairs along the arrises
- Joints too narrow for the movement, which need redesigning by the engineer
Not sure which it is? You can ring 01277 525 020 or send details through our quote form and we’ll tell you honestly.
Joints and surfaces we work on
- Precast concrete panel joints
- Cladding panel joints
- Car park decks and ramps
- Brickwork movement joints
- Podiums and floor movement joints
- Blockwork control joints
Commercial clients in Portchester
For main contractors, we work as the sealant subcontractor, on new build and refurbishment alike. We work to your programme, your specification and your site rules.
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.
How the quote is worked out
Your fixed quote is built from the real scope. It takes account of:
- The size and state of each joint
- Induction, permit and paperwork requirements
- Removal of failed or old sealant
- Quantities, in metres or numbers
Small jobs and large programmes are priced from the same things: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote, and you’ll have a fixed figure to work with.
What we need to price the job
Diagnosis starts before we arrive. Tell us:
- Anything awkward about access or site hours
- Drawings or a marked-up plan, if available
- The product your specification calls for
- A wide shot and a close-up of the area
Every quote starts with the facts: what’s there, how much of it, how we reach it and what’s specified. Share whatever details you have and we will fill any gaps with a visit.
Our process
The first thing on site is a walk round with your contact, to confirm the scope, the order of work and any areas we must keep clear. Then we strip out anything that has failed, prepare every joint and seal it. Work in places the size of Portchester is planned as a single visit where we can. Clear photographs and measurements help us bring the right products.
- We assess the joints on site or from photos, noting widths and how each has failed.
- You receive a fixed quote stating the product and the movement it is rated for.
- Phasing is agreed so decks, floors or entrances can stay in use where needed.
- We strip the old sealant or filler and prepare each face until it’s sound and dry.
- Backing rod or bond-breaker sets the depth, primer goes on where specified, and the sealant is applied and tooled.
- We check each joint with you, confirm the cure time and sign off under our 12-month guarantee.
What we need from you
- Explain the parking and delivery arrangements
- Send asbestos survey details if the building is pre-2000
- Flag any permit to work we’ll need
Quotes
Send details, get a quote, we seal, guaranteed: that’s how every job runs. To take the first step, call 01277 525 020 or email the details over.
Advice
Floors, slabs and movement joints in Portchester
Portchester is within about 1 mile of the coast. Open joints in coastal car parks and yards let in salt-laden water as well as grit, so it pays to keep them sealed. Portchester is about 64 miles from central London. Warehousing clusters around the motorways that ring and radiate from London, and their floor joints take forklift and pallet-truck traffic all day.
Schools like Castle Primary School often have long brick elevations with movement joints that age quietly. Estates like Castle Trading Estate (less than half a mile north of Portchester) combine warehouse slabs, yards and loading bays, all with joints under wheels. Another example is Oak Park Industrial Estate, 1.7 miles east of Portchester, where floors and yards would be done in stages around the occupiers.
Portchester is about 3 miles north-east of Gosport, in Hampshire. Commercial clients in Portchester use us for work on movement joints. Across Hampshire, 723 places are covered, including Portchester.
Anyone looking for expansion joint sealing in PO16, PO6 and PO17 gets the same process as the rest of our area: send details, get a quote, we seal, guaranteed. For a building on Cow Lane, Hill Road and Ralph Road or nearby, send details and we will quote for movement joints. Just outside Portchester, we also work in Boarhunt (2 miles north-west), Southwick (2 miles north), Elson (2 miles south-west), Wallington (2 miles west) and Priddy's Hard (2 miles south). Nearby towns on our patch include Gosport (3 miles south-west), Havant (6 miles east), Eastleigh (13 miles north-west), Fareham (3 miles west), Horndean (7 miles north-east) and Chandler's Ford (15 miles north-west).
Local landmarks in Portchester
We work on buildings around Portchester Community School and The Cormorant pub and the streets around them. Portchester’s nearest station is Portchester station, about 0.5 miles north-west of the centre. Well-known places in the area include Portchester Castle (under half a mile south-east) and Queen Alexandra Hospital (2.3 miles east). For a walk, there’s West of the River Alver and Portsdown Hill.