The Mastic Doctor team standing beside their branded vans outside an office building
Kent · England

Commercial Sealant Contractors in Deal

Sealant work for offices, shops, hotels and other commercial buildings in Deal and across Kent. CHAS accredited and fully insured, with a 12-month guarantee.

  • Frame mastic that has hardened and come away from the wall
  • Greasy, split joints in a kitchen or tea point
  • Messy, uneven beads from earlier work that let the building down
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
Signed off, with 12 months’ guarantee.
London, the South East & Scotland
Constructionline member
Fully insured: £5m PL

Commercial sealant contractors for Deal sites

Photos, a specification or a quick description of the joints is enough to start a fixed quote.

What sealant work can’t fix

Our job is the joint, not everything around it. On its own, sealant can’t deal with:

  • Faulty windows rather than failed perimeter sealant
  • Walls or slabs moving more than any sealant can take
  • Leaks from pipework, wastes or valves (that’s plumbing)

Not sure which it is? You can call the office on 01277 525 020 or email us and we will tell you honestly before you book.

Surfaces we seal

  • External facade joints
  • Kitchen worktops and splashbacks
  • Window and door perimeters
  • Washrooms and tea points
  • Floor and threshold joints
  • Movement joints in walls and floors

How we handle commercial sealant contractors in Deal

Inside a commercial building, sealant does a lot of quiet work: washroom fittings, kitchen worktops, window boards, partition heads and the line where floors meet walls. Outside, it closes facade joints, frame perimeters and movement joints against the weather. We deal with internal and external sealant joints alike, picking the product for each location rather than one tube for everything. We work on washrooms and tea points, external facade joints and movement joints in walls and floors, and the usual reasons a site gets in touch are expansion joints with the sealant torn out and weathered facade sealant that no longer flexes. For commercial sealant work in Deal, you deal with one contact from quote to sign-off, whether it’s one building or several.

We price commercial jobs in Deal from photos, drawings or a site visit, with the scope listed so everyone knows what’s included.

Many businesses in towns like Deal work from older buildings that have been altered more than once. Joints where brick or render meets a newer frame or panel move differently, so the sealant has to suit both sides, in a colour that suits the frontage.

Work we carry out comes with a 12-month guarantee. Should something we installed fail, give us a call on 01277 525 020 or use the quote form and we’ll come back to it.

The Mastic Doctor team beside their liveried vans in front of an office building
Location
Deal (CT14)
Region
Kent
Cover
12 months on our workmanship
Price
Fixed quote, scope in writing
Phone
01277 525 020
Page updated
3 November 2026

What we’re called out for in Deal

A good share of the joints we inspect were topped up instead of being renewed. Fresh sealant won’t stick to the old bead underneath. Getting back to a clean joint then means removing every layer.

Typical triggers for a call:

  • Earlier reseals applied straight onto the failed bead
  • Leaks that seem to come through a sealant line
  • Untidy joints in a reception, shop floor or lobby
  • Hardened, chalky sealant on south-facing or exposed elevations

Premises within reach of Deal station (0.5 miles north-east of Deal) often have busy frontages where joints are seen by everyone passing.

What to look for in a quote

  • Their pre-qualification and accreditations
  • How the existing material will be dealt with
  • What the guarantee covers, and for how long
  • How the joint faces will be prepared and primed

Our contractor checklist

Different surfaces, different methods

Washrooms and toilets

Around WCs, urinals, vanity tops, IPS panels and cubicles, sealant is wet most of the day. Old sealant comes out and a sanitary silicone with anti-mould additives goes in, phasing the rooms so not every toilet is closed at once.

Window and door perimeters

The perimeter joint between a frame and the structure keeps rain out of the reveal. Failed perimeters are cut out and cleaned, backing goes into deeper gaps, and the joint is resealed with a low-modulus neutral-cure silicone or another suitable product.

Doing it in-house

Site maintenance staff can often handle a short internal joint. Where it goes wrong is preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.

The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.

Shops, offices and hotels in and around Deal

Deal sits close to the coast, within about 1 mile. Exposed frontages near the sea are hard on sealant, so the product has to suit the weather as well as the look. A matched colour is only half the brief on an exposed frontage. Deal is about 67 miles from central London. The South East around the capital has large numbers of business parks, offices and retail centres, especially around the motorway corridors. Occupiers with several premises in the region tend to prefer one contractor and one point of contact.

For a hotel such as Queens Hotel (0.5 miles north-east of Deal), the colour of a joint at the bar or the bath matters to the look of the room.

Deal is about 14 miles east of Canterbury, in Kent. Any commercial site in Deal is covered, whether it’s a single job or part of a planned programme. We work across 931 places in Kent. London is covered too, around 67 miles from Deal.

Postcode districts covered here: CT14 for sealant joints. For a building on London Road, Forelands Square and Herschell Square or nearby, send details and we will quote for sealant joints. Main routes into Deal include the A258 and B2056, which helps when planning parking and deliveries for the job. Just outside Deal, we also work in Mill Hill (1 mile west), Walmer (1 mile south), Sholden (1 mile north-west), Sholden Meadows (1 mile north-west) and Great Mongeham (1 mile west). Bigger towns within reach include Canterbury (14 miles west), Margate (11 miles north), Dover (7 miles south-west), Folkestone (13 miles south-west), Ramsgate (8 miles north) and Broadstairs (10 miles north).

Local landmarks in Deal

Around Deal, our work takes us to commercial buildings near Betteshanger Park, Brickmakers Arms and Deal Parochial Church of England Primary School. For rail, the closest station is Deal station, roughly 0.5 miles north-east of the centre. Nearby you’ll also find Kent Museum of the Moving Image (0.6 miles north-east) and Deal Castle (0.5 miles east).

Map of Deal © OpenStreetMap contributors

Looking after the joints

Regular inspection catches problems early. Specifically:

  • Act on the first lifting edges rather than waiting
  • Check sealant as part of routine building inspections
  • Keep abrasive pads and scrapers off resealed joints
  • Have extract fans checked so wet areas dry out

Good ventilation keeps wet-area sealant in better condition. Extraction that isn’t working keeps the joints wet. Your maintenance team can look at extract fans at the same time.

Tenants and staff spot black or split sealant quickly, and in a hotel, office or shop it makes the whole space look neglected. Replacing it on a planned cycle keeps complaints down.

FAQs: Deal

Can you supply sealant in our brand colour for a site in Deal?

Yes, we can normally get close to most finishes from the product’s colour range. Send colour references or photographs and we will confirm what’s available for the product.

Does a hotel in Deal need to shut while its sealant is renewed?

Rarely, if ever. We take a few rooms out at a time. Tell us your quiet periods and access windows and we will plan around them.

Is the old sealant taken out first?

Removal comes first, every time. After that come cleaning, primer where needed, backing and the new sealant.

Could the old sealant in an older building contain asbestos?

It can, on some older buildings. That’s why we ask for the asbestos information first, and stop if a material is suspect until it’s tested. HSE guidance on asbestos is a useful reference.

Can you supply RAMS and insurance details?

Tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we’ll confirm with the quote. We are CHAS accredited and a Constructionline member, with five million pounds of public liability insurance.

How long before the joints can be used?

Curing time varies by product, and we confirm it on the day, and sign any area that should be left alone.

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.

How a job runs

In a busy building, the work is phased so only one area is out of use at a time. Each area is protected, prepared and sealed before the next one starts. For a town like Deal, we try to group jobs for the same client into one visit. Give us your access times and we will fit the work in.

  1. Site photos, drawings or a visit tell us what’s there and how it has failed.
  2. A fixed quote follows, with removal and preparation included.
  3. Sequence, access and working times are settled before the first joint is touched.
  4. Each joint is stripped, cleaned back to sound faces and primed where the maker specifies.
  5. Depth is set with backing, then the sealant is applied, tooled and the area tidied.
  6. Completed areas are signed off with you under our 12-month guarantee.

Getting the site ready

  • Let building users know which areas are affected
  • Tell us which areas need to stay in use
  • Share your working hours and any access restrictions

Get a fixed quote

To get a fixed quote, speak to us on 01277 525 020 or email drawings and photos. You can also send details through our quote form.

Get a price

Related advice

Accreditations

Trusted. Accredited. Insured.