Mastic contractors in Southfleet
Mastic packages for new-build and refurbishment projects across Southfleet, by CSCS-carded applicators. Fully insured and CHAS accredited.
- Existing joints on a refurb that need cutting out and resealing
- A mastic package split between trades with no clear owner
- Cracks opening in caulked internal joints
Construction mastic in Southfleet
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
What sets the cost
Sealant work doesn’t have a standard rate, because every site is different. What we look at:
- How much there is to seal
- Backing rod, priming and other preparation
- Whether old sealant has to be cut out first
- Location, for remote and island sites
There’s no price list, because the scope varies so much from one building to the next. For a fixed figure, call for a quote and we’ll price your job on its own details.
What we need to price the job
There’s no need for a formal survey. A few details are enough to get going:
- Asbestos survey details if the building is older
- Any dates the work must fit around
- Anything awkward about access or site hours
- The site address and postcode
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to phone 01277 525 020 or email us with what you know.
About our construction mastic in Southfleet
Buyers, tenants and clients notice sealant lines long before they notice the structure. Untidy or missed joints are among the commonest snag items and clearing them late eats into the handover window. We seal so the snag list stays short, area by area through the programme. We work on internal decorators’ caulk, window and door perimeters and floor and skirting junctions, and what we are called in for most is caulk cracking where joints are moving more than expected and inconsistent sealant finishes from plot to plot. A specialist sealant contractor works differently from a general builder: in Southfleet, that means joint design, primers and backing rod as standard.
For a site near Southfleet, the mastic visit is planned so the right sealants, primers and backing rod are on hand. Drawings, photos and the programme let us give a fixed quote.
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
- Southfleet (DA13)
- Wider area
- Kent
- Cover
- 12 months on our workmanship
- Quotes
- A fixed quote before we start
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Nearby places to Southfleet
What else we do in Southfleet
Mastic packages on Southfleet sites
Rainfall across the South East, Southfleet included, is lower than in many parts of the UK. That doesn’t stop wet spells, or frosty starts that leave panels too damp to seal, so external mastic is timed for workable conditions and agreed with the site manager. At about 19 miles from central London, Southfleet is within reach of the capital. Towns within reach of London tend to keep building, from flats to offices and schools, which keeps mastic packages in demand.
Historic houses such as Cobham College (to the south-east of Southfleet) are a reminder of the older buildings in the wider area, where sealing against old stone, brick or timber needs compatible products. On a healthcare site such as Gravesham Community Hospital, 2.8 miles north-east of Southfleet, new blocks and refurbishments go on while the hospital keeps running, so mastic work is sequenced carefully. When units on a site such as Fawkham Business Park, 1.7 miles to the south-west of Southfleet, are refurbished or reclad, the panel joints and window perimeters are part of the mastic package.
Southfleet is about 2 miles south-west of Northfleet, in Kent. If you’re looking for construction mastic in Southfleet, we can help. Our Kent coverage takes in 931 places, from busy centres to rural villages. Our London page has more on work in that area (19 miles or so).
Postcode districts covered here: DA13 for mastic packages. We cover commercial and managed buildings on Red Street, Gloxinia Road and Brakefield Road and the roads nearby. Just outside Southfleet, we also work in Hook Green (1 mile south-west), Northfleet Green (1 mile east), Betsham (1 mile north-west), Painters Ash (1 mile north-east) and Springhead (1 mile north). Nearby towns on our patch include Maidstone (13 miles south-east), Dartford (5 miles north-west), Sevenoaks (11 miles south-west), Gravesend (3 miles north-east), Tonbridge (15 miles south) and Swanley (7 miles west).
Near you in Southfleet
Recent enquiries here include premises near Northfleet School for Girls, Black Lion pub and Longfield Chalk Bank and the streets around them. The nearest railway station is Longfield station, about 1.5 miles south-west of the centre. A little further out are Gravesham Community Hospital (2.7 miles north-east) and Bluewater (2.9 miles north-west). The countryside around Southfleet includes Sawyers Lake.
Maintenance after handover
Sealant joints are maintenance items, and how long they last depends on how they’re treated. We suggest:
- Don’t schedule sealing before decorators and flooring are done
- Stick to the specified sealant rather than a generic substitute
- Flag uneven or tapered frame gaps early
- Allow flexibility for external sealing in damp or cold weather
At handover, keep the product details with the O&M information. Future maintenance is easier when the products are known and avoids guesswork when joints are renewed. Tell us what records you need and we will confirm with the quote.
Sanitary joints that fail early become defects soon after occupation. Leaks behind showers and basins damage finishes and floors. Getting the product and preparation right first time avoids that.
Different surfaces, different methods
External facade and movement joints
Brickwork, blockwork and panel movement joints need a sealant with the right movement capability. Depth is controlled with backing rod so the bead bonds to two sides only.
Fire-rated sealant where specified
Fire-rated sealant is one type of fire-stopping product. Other products are used for some services and gaps. Record requirements are agreed with the quote.
What sealant work can’t fix
Part of a good diagnosis is knowing where sealant stops. You will hear from us if the cause turns out to be any of the following:
- Frame gaps too wide for sealant, which the installer needs to correct
- Joints damaged after sign-off by following trades
- Designing joint widths or choosing the specification (that sits with the designer)
If in doubt, give us a call on 01277 525 020 or email a schedule or drawings and we will say what we think.
Surfaces we seal
- Cladding and panel joints
- Floor and skirting junctions
- Sanitary and kitchen joints
- Internal decorators’ caulk
- Brick and block movement joints
- Window and door perimeters
Diagnose, treat, sign off
Before any cutting starts, the area is protected: tape along each joint edge and covers over finishes, stock and equipment close by. On site, the work typically takes a day or two on a small fit-out and several weeks on a large multi-storey package, and we clear our waste as we work. Smaller jobs around Southfleet can be grouped with others nearby. You’ll have a fixed quote before work starts.
- We price from the drawings, specification and programme you send.
- A fixed quote sets out the scope, the products and the sequence.
- Any site paperwork you need (RAMS, insurance certificate, CSCS details) is confirmed with the quote.
- Work follows the programme, area by area, as rooms and elevations become ready.
- Joints are cleaned, primed where the maker requires it, backed and sealed to the specification.
- Snags are cleared before handover and completed areas carry our 12-month guarantee.
Before we start on site
- Send your site hours and access windows
- Make sure the joints can be reached
- Point out parking and an unloading spot
Request a quote
The quickest route to a quote is a few photographs and the site postcode. Upload them with the quote form, or speak to us on 01277 525 020 or send details through our quote form to discuss it first.
Read more
Doing it in-house
Site maintenance staff can often handle a short internal joint. The usual problems come from preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.
Certain joints really need a specialist: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. A poor seal in places like these tends to cost more to put right later.
Common questions from Southfleet clients
Is Southfleet off your patch?
Not at all. Southfleet is within our area. London and every South East county are within our area. Send photographs and a list of what needs doing, and we will plan the job to need as few trips as possible.
Does your area include sites such as Fawkham Business Park, near Southfleet?
Yes, sites like Fawkham Business Park are within our area, along with the rest of Southfleet. To start, just give us a call on 01277 525 020 or email a schedule or drawings with the unit, the joints involved and your access times.
Is it fine to apply new sealant on top of old?
No. We cut the old material out and clean the joint back before sealing, because fresh silicone will not bond with aged silicone.
When is resealing likely to be due?
It depends on movement, UV and weather, cleaning, traffic and the product. Treat them as maintenance items and inspect them regularly.
How long before the joints can be used?
That comes down to the sealant and the temperature. Some take light use quickly, others need longer to cure, so we will confirm the curing time on the day.
Which sealant will you use?
The specification comes first, if there is one. Without one, the joint decides: its movement, its surfaces and what it has to cope with.
What accreditations do you hold?
Our applicators are CSCS-carded, and we hold CHAS accreditation and Constructionline membership. Tell us what site paperwork you need and we’ll confirm with the quote.