Facade and window perimeter sealing in Gosport, Hampshire
We carry out facade joint and window perimeter sealing on commercial buildings in Gosport and the surrounding area. Send details for a fixed quote.
- Staining on stone next to old sealant
- Cladding panel joints that have opened up
- Weathered joints at frame-to-structure perimeters
Facade sealing near Gosport
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Maintenance after handover
A few simple habits keep the new joints working:
- Combine resealing with other works that need access
- Check the asbestos register before old mastic is disturbed
- Keep the sealant details on the building file
- Inspect facade joints on a regular cycle
Keep gutters, sills and drainage paths clear. Sealant copes better when water runs off the facade as designed rather than sitting against the joints.
Deal with sections that fail early as soon as they show. Small repairs stop small leaks becoming large ones inside the building.
About our facade sealing in Gosport
Most facade joint failures trace back to the joint, not just the sealant. Joint width needs to match how far the joint moves and how far the sealant can stretch, and closed-cell rod sets the depth, keeping the bond to two faces with the ratio the sealant maker recommends, often around 2:1. Most enquiries involve staining on stone next to old sealant and weathered joints at frame-to-structure perimeters, across coping and flashing joints, perimeter joints where frames meet the structure and stone and brick facade joints. Looking for mastic applicators who cover Gosport? Mastic Doctor has worked for contractors, FMs and building owners since 2005, with CSCS-carded applicators.
Many towns of Gosport’s size have older buildings being converted or extended, so new windows and cladding meet old masonry. Getting the product and primer right for both faces is what keeps those joints sound.
Every job ends the same way: guaranteed. Our workmanship is backed for 12 months, and the quote explains what it covers.
- Place
- Gosport (PO12, PO13)
- Wider area
- Hampshire
- Cover
- 12 months on our workmanship
- Quotes
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
Honest limits
Sealant solves a lot, but not everything, and we are upfront when that’s the case. It won’t fix:
- Cracked or spalling substrates that need repair before sealing
- Installing or repairing glazing systems
- Damp caused by condensation inside the building
If you’re not sure, just call the office on 01277 525 020 or email a schedule or drawings and we will give you a straight answer.
Joints and surfaces we work on
- Window and door perimeters
- Stone and brick facade joints
- Shopfront frames
- Cladding panel joints
- Coping and flashing joints
- Perimeter joints where frames meet the structure
Our process
Diagnose, treat, sign off: that’s the shape of every visit. We inspect the joints and confirm what’s in scope, then we prepare and seal each joint with the specified product, and the job ends with a walk round and sign-off. In a town such as Gosport, most jobs are single buildings. Your photos, drawings or a site visit come first, followed by a fixed quote.
- First we review photographs, drawings or what we saw on a visit, and agree how each joint will be reached.
- Failed sealant is cut out along its full length.
- Joint faces are cleaned to firm, sound material, with primer where the sealant maker specifies it.
- Backing rod, or bond-breaker tape in shallow joints, limits the depth.
- A facade-grade sealant rated for the movement goes in, tooled to a concave profile.
- We walk the finished joints with you before handing over.
Preparing the site
- Let us know about inductions and permits
- Tell staff and tenants when we’ll be in
- Explain the parking and delivery arrangements
Get a fixed quote
Photos, drawings or a schedule of the joints are often enough for a fixed quote. If the job needs a look first, we’ll arrange a site visit.
Read more
Why deal with it now?
Every shower drives water through a split perimeter bead. The damage builds out of sight: wet linings, rusting fixings, staining and spoiled finishes. Resealing now costs less than repairing interiors later. In a town such as Gosport, a lot of buildings are older and have been altered over time, so joints between old and new are often the first to go. Resealing them early protects the building behind.
Quantities, awkward access and phased working all shape the price. Site requirements like inductions and permits play a part as well, along with the time of year for external work.
Why appoint us
- Matching to RAL references, product permitting
- Fully insured, including public liability cover
- Commercial sealant work since 2005
- Work carried out by CSCS-carded applicators
Take a look at what affects the cost or our accreditations and insurance.
What the job involves on each surface
Brick and stone facades
Joints in natural stone need care to avoid staining. The specified stone-compatible sealant is what we use, and mask the edges carefully.
Coping and flashing joints
Sometimes the coping or flashing itself has failed. We tell you if the fix is a roofing or metalwork job rather than a reseal.
Nearby places to Gosport
What else we do in Gosport
Gosport: questions and answers
Could you schedule work at a campus like University of Portsmouth - North Zone for the vacation?
Yes, holiday working periods are the norm on campus jobs. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.
Is a hospital such as Gosport War Memorial Hospital somewhere you can work?
Yes, provided the work is planned with the site’s estates team. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.
How many days will you need on site?
It depends on the scope, but the work normally takes anything from a single day to several weeks, depending on joint lengths, access and the weather. For bigger or phased jobs, we will set out a timescale with the quote.
How do you choose the sealant?
The specification comes first, if there is one. Without one, the joint decides: how much it moves, what it bonds to and whether it’s wet, trafficked or fire-rated.
Are you insured?
Yes. Mastic Doctor is fully insured, public liability included.
Is old mastic on our building likely to contain asbestos?
It’s worth checking in any building from before 2000. The dutyholder holds the asbestos register. Suspect material is left alone until it has been tested.
Do you seal facades in winter?
Wet joints or temperatures outside the product’s range mean waiting. We plan for weather and keep you updated throughout the job.
New build and refits around Gosport
Gosport sits close to the coast, within about 2 miles. Schemes this close to the sea see their facade joints tested by wind and rain from the day they’re sealed, and the sealant, primer and backing need choosing with that in mind. At about 66 miles from central London, Gosport is within reach of the capital. Construction around the commuter belt mixes station-side flats with refurbished offices and units, which keeps mastic packages in demand.
On a campus such as University of Portsmouth - North Zone, 2.4 miles to the east of Gosport, new teaching buildings and residences are typically built and refurbished around the academic year. For contractors at a college like St Vincent College, 0.7 miles east of Gosport, perimeters and internal sealant are timed for the holidays.
Gosport is in Hampshire. We cover commercial sites throughout Gosport, whether it’s a single job or part of a planned programme. We work across 723 places in Hampshire, large and small.
We cover the PO12 and PO13 postcode districts. Among the streets we cover are Station Road, St Johns Square and Cockleshell Square, and sites on any of them can send details for a fixed quote. Main routes into Gosport include the A32 and B3333, which helps when planning parking and deliveries for the job. If your building is just outside Gosport, we cover Forton (1 mile south-east), Elson (1 mile north), Priddy's Hard (1 mile east), Bridgemary (1 mile north-west) and Rowner (2 miles north-west). Further afield, our area takes in Havant (8 miles north-east), Eastleigh (14 miles north-west), Fareham (4 miles north-west), Horndean (9 miles north-east), Hedge End (10 miles north-west) and Waterlooville (8 miles north-east). Gosport is one of the busier places in Hampshire, and its commercial and public buildings are all within our area.
Local landmarks in Gosport
In Gosport, that means premises near St Vincent College, Brune Park Community School and Queen's Head pub, among other places. Gosport’s nearest station is Portsmouth Harbour station, roughly 2 miles east. Nearby you’ll also find Search (1.3 miles south-east) and Gosport War Memorial Hospital (0.8 miles south). For a walk, there’s Portsdown Hill and West of the River Alver.
Signs you need facade sealing in Gosport
Most facade joints fail through age and weathering. UV and weather harden the sealant until it can’t stretch with the building, and cracks or adhesion loss follow.
It’s worth sending us details if you spot any of the following:
- Perimeter joints where frames meet the structure
- Damp patches beside frames after rain
- Gaps between rainscreen or cladding panels
- Old perimeter mastic that has dried out
For contractors refurbishing units at places like Brockhurst Gate Retail Park, which lies north of Gosport, the mastic covers cladding panels, roller-door and window perimeters.
What to look for in a quote
- Health and safety accreditation such as CHAS
- How the joint faces will be prepared and primed
- Their approach to joint depth and backing
- Whether old or failed sealant will be cut out, not overlaid