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

Expansion Joint Sealing in Chatham Green

Planning work on a movement joint in Chatham Green? We look at it, seal it with the right product and hand it over with a 12-month guarantee.

  • Water getting into the wall through a failed joint
  • Torn sealant in brick or block movement joints
  • New sealant over old, now failing
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
London, the South East & Scotland
CHAS & Constructionline
£5m PL insurance

Expansion joint sealing in Chatham Green

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

About our expansion joint sealing in Chatham Green

Internal floor joints take trolleys, pallet trucks and forklifts. Without a sound filler, joint edges chip and spall under load. If the arrises are already broken, we will say so before sealing. We work on precast concrete panel joints, cladding panel joints and podiums and floor movement joints, and the usual reasons a site gets in touch are movement joints with split or torn sealant and water dripping through deck or ramp joints. Searching for sealant specialists in Chatham Green? We’ve been sealing commercial buildings since 2005, CHAS accredited and a Constructionline member.

Halls, schools and small commercial buildings near places like Chatham Green have movement joints in brick, block and concrete too. They’re easily forgotten until water gets in or an edge breaks.

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.

The Mastic Doctor team standing beside their branded vans outside an office building
Place
Chatham Green (CM3)
Region
Essex
Cover
A 12-month guarantee
Quote
A fixed quote before we start
Telephone
01277 525 020
Last updated
3 November 2026

Chatham Green: questions and answers

Can you work on a hospital site such as Broomfield Hospital?

Yes, provided the work is planned with the site’s estates team. Work is phased so departments keep running, under the site’s own rules.

Is Chatham Green off your patch?

No. Places such as Chatham Green are covered as much as the big towns. Our area covers London and the South East counties. Good photographs up front let us bring everything on the first visit.

What if the joint edges are damaged?

A bond is only as strong as the material behind it, so we’ll tell you if the edges need repairing before sealing. Where it’s visible beforehand, we will say so when we quote.

Which sealant will you use?

A specification, where there is one, decides it. Without one, the joint decides: its movement, its surfaces and what it has to cope with.

What if there’s asbestos in the old mastic?

Asbestos is possible in some older mastics, particularly in buildings from before 2000. We check the asbestos register before cutting out old sealant in an older building, and work stops until any suspect material has been tested. Removing asbestos is a job for asbestos specialists, not us.

Can you quote from photos?

That depends on the size and complexity of the job. Simple work can often be priced from photographs, and bigger or more complex jobs normally get a visit.

Do you take on multi-site work?

Yes. A group of buildings can go on one quote, and you deal with one contact throughout across South East England, Greater London and Scotland.

On site: what to expect

Before any cutting starts, the area is protected: masking tape along the joint edges and sheeting over anything nearby. The work itself normally takes anything from part of a day to a couple of weeks, depending on joint lengths, widths and access, and our waste is bagged and taken away as we go. Smaller jobs around Chatham Green can be grouped with others nearby. A fixed quote is given before anything starts.

  1. First the joints are inspected, widths measured and the type of failure noted.
  2. You receive a fixed quote stating the product and the movement it is rated for.
  3. Where areas have to stay open, we agree a phased sequence before starting.
  4. The failed seal is cut out and both joint faces cleaned back to sound material.
  5. Backing rod or bond-breaker sets the depth, primer goes on where specified, and the sealant is applied and tooled.
  6. We check each joint with you, confirm the cure time and sign off under our 12-month guarantee.

What we need from you

  • Let building users know which areas are affected
  • Let us know about inductions and permits
  • Agree which areas must stay open

Request a quote

Specifications, drawings and tender packages are welcome with any enquiry, and we’ll price against exactly what is specified. For smaller jobs, photos and a description will do.

Get a quick quote

Advice

Why it’s worth doing now in Chatham Green

Combining joint work with other maintenance reduces set-up costs. But joints already letting water in shouldn’t wait for a programme because damage continues. We can split the scope into urgent and planned. Around Chatham Green, it’s better to renew all the failing joints at once. Send photos of each area and we’ll quote for the lot.

What a job costs comes down to the quantity of joints, what has to come out first and the access. Call for a quote when you’re ready.

Why us?

  • Joints cleaned back to sound surfaces
  • Work carried out by CSCS-carded applicators
  • Workmanship guaranteed for 12 months
  • Work to your specification and the manufacturer’s guidance

Take a look at how commercial sealant jobs are priced and our accreditations and insurance.

Maintenance after handover

Cleaning and maintenance staff play a part too. Share these points with them:

  • Raise snow-clearing blades over deck joints where possible
  • Record the sealant used and the date in the O&M file
  • Check joints after long freezing spells
  • Report split or peeling joint sealant early

Our workmanship on movement joints carries a 12-month guarantee. Record which product went into which joints in the building file so future maintenance isn’t guesswork.

On a multi-storey car park, a failed joint usually shows up as a leak onto the deck underneath. That water often carries de-icing salts with it and it can affect the structure over time. Sealing the joint promptly stops it at source.

Joints that move: notes for Chatham Green

The South East is one of the drier parts of the UK. External slab and deck joints still need a dry, clean joint to seal, and where de-icing salt is spread in winter, open joints let it in. Central London is about 33 miles from Chatham Green. The South East has large numbers of industrial estates and warehouses along the motorway corridors.

Another example is Regiment Business Park, which lies south of Chatham Green, where floors and yards would be done in stages around the occupiers. For an estate such as Broomfield Hospital (2.9 miles south of Chatham Green), the joints in ramps, decks and long building elevations all need attention over time.

Chatham Green is about 5 miles north of Chelmsford, in Essex. Anywhere in CM3, the process is the same: send details, get a fixed quote, we seal, and the work is guaranteed. 644 places across Essex fall within our area, including Chatham Green. For work in that direction, see our London page.

Postcode districts covered here: CM3 for movement joints. Close to Chatham Green, our area also takes in Little Leighs (1 mile north-east), Howe Street (1 mile south-west), Hartford End (2 miles north-west), Willows Green (2 miles north) and Ford End (3 miles west). Bigger towns within reach include Chelmsford (5 miles south), Braintree (6 miles north-east), Brentwood (15 miles south-west), Maldon (10 miles south-east), Billericay (13 miles south) and Witham (6 miles east).

Near you in Chatham Green

Chatham Green’s nearest station is Beaulieu Park station, about 4.1 miles south. A little further out are Broomfield Hospital (2.9 miles south). The countryside around Chatham Green includes Sandylay and Moat Woods.

Map of Chatham Green © OpenStreetMap contributors

For managing agents and facilities managers

When you manage a building on behalf of an owner, you need clear quotes and clear reporting. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative, plus a 12-month guarantee.

Building owners and managing agents use us on everything from one building to a spread of sites around Chatham Green. Several sites can go on one quote, which keeps the paperwork simple.

When it isn’t the sealant

Part of a good diagnosis is knowing where sealant stops. We’ll tell you if the real problem is any of the following:

  • Broken or spalled joint edges, which need repairing before any sealant goes in
  • Joints too narrow for the movement, which need redesigning by the engineer
  • Failed waterproofing membranes on podiums, roofs or decks (a waterproofing specialist’s job)

Not sure which it is? You can ring 01277 525 020 or email a schedule or drawings and we will tell you honestly before you book.

Joints and surfaces we work on

  • Blockwork control joints
  • Brickwork movement joints
  • Car park decks and ramps
  • Cladding panel joints
  • Podiums and floor movement joints
  • Precast concrete panel joints

Common problems we fix in Chatham Green

Sealant peeling cleanly off one side is an adhesion failure. Poor preparation, a skipped primer, or sealant bonded to the back of the joint are typical reasons, and it’s common on joints sealed in a hurry.

Clients typically get in touch after noticing one or more of the following:

  • Brittle, chalky sealant on external joints
  • Previous reseals laid over old sealant
  • Water getting into the wall through a failed joint
  • Leaks through car park deck joints onto the level below

A campus such as Anglia Ruskin University, 5 miles south of Chatham Green, has long runs of movement joint in its buildings, decks and paving.

Comparing quotes

  • Whether old or failed sealant will be cut out, not overlaid
  • Are they CHAS accredited or on Constructionline?
  • Will RAMS and insurance details be available?
  • Proof of insurance

Our contractor checklist

Accreditations

Trusted. Accredited. Insured.