Essex · England

External Mastic in Colchester

Professional external mastic in and around Colchester, with old sealant always removed completely and a 12-month guarantee.

  • Failed sealant between panels on a façade
  • Rain getting behind render or cladding at a joint
  • Joints pointed up with cement by mistake

Trusted external mastic in Colchester

Quotes for external mastic in Colchester

We quote each job individually. This is what makes a difference:

  • Mould in or behind the old joints
  • The number of rooms or windows
  • Which sealant suits the joint
  • Access and height

We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or drop us an email.

Asking for a quote

Photos by email are helpful but not essential. Try to tell us:

  • What the problem is, such as mould, gaps, leaks or cracking
  • The rough size of the job
  • Pictures of the joints, sent by email
  • The type of property

Need a quote? Please phone 0345 464 0079 or send us an email and tell us about the job. We’ll explain what we’d do and send you a clear quote before work begins.

External mastic in Colchester, done properly

Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant. Common call-outs are for joints with sealant missing in places and damp patches traced to an open external joint, across render & cladding joints, brickwork movement joints and concrete & block.

Landlords and managing agents in Colchester have plenty of walls and rooflines to keep an eye on. A failed joint above a door or a dripping gutter end is generally the first sign.

The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or email us.

Location
Colchester (CO4, CO3, CO2, CO1)
Region
Essex
Cover
12 months on all our work
Quotes
A clear quote up front
Call
0345 464 0079
Last updated
26 October 2026
Outdoor mastic being applied where a white frame meets red brickwork, below the fascia and gutter

Aftercare tips

How long the joints last depends on use and care. Here’s what we suggest:

  • Deal with leaking gutters that soak the joints below
  • Tell anyone working on the walls about the movement joints
  • Avoid pressure-washing directly into sealant joints
  • Make sure movement joints aren’t pointed over

Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.

Once a joint cannot move, the wall finds another way, often as cracks near the joint. Catch it early and you reduce the risk.

What sealant work cannot fix

Sealant is not the answer to every problem, and we’d rather say so up front. Sealant won’t put right:

  • Loose or hollow render, which needs re-rendering
  • Damp that is not coming from the joint
  • Subsidence or other structural problems

Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before booking.

What we seal

  • Concrete & block
  • Copings & trims
  • Brickwork movement joints
  • Render & cladding joints
  • Joints between brick and frames
  • Façade panels

Do you need external mastic in Colchester?

Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.

It’s worth asking for a quote if you see:

  • Sealant that has lost its bond to the brick or render
  • Weeds or debris growing in open joints
  • Cracked joints where brick meets render or frames
  • Brick movement joints where the sealant has split

If you live in an older home near Church of St Peter, older walls, gutters and the joints where extensions meet them need a flexible sealant.

Questions to ask before booking

  • Whether VAT is included
  • Whether you can choose the colour
  • Whether the sealant suits the joint
  • Whether they seal over old material or remove it

Our hiring checklist

What external mastic looks like in Colchester

Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.

If you let a flat or house near Colchester Town station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. If you look after a building such as Colchester Sixth Form College, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.

Colchester is in Essex. Wherever you are in the CO4 postcode area, our applicators can take on external mastic. Our Essex coverage runs to 644 places, Colchester among them. Chelmsford is on our list too, about 21 miles from Colchester.

All of CO4, CO3, CO2 and CO1 is within our area for external mastic, from the main roads to the quietest streets. Streets in the area include High Street, North Station Road and Durham Square, all of which we cover. Colchester sits on or near the A12 and A120, which makes travel easy. We also cover the places around Colchester: Camulodunum (1 mile west), Braiswick (1 mile west), Abbey Field (1 mile south), Lexden (1 mile west) and Beacon End (3 miles west). We also work in nearby towns such as Braintree (14 miles west), Clacton-on-Sea (12 miles south-east), Maldon (15 miles south-west), Witham (13 miles south-west), Halstead (12 miles west) and Heybridge (14 miles south-west). Being one of Essex’s larger places, Colchester has every kind of property, from flats to offices.

Near you in Colchester

Around Colchester, our work takes us to homes and buildings near Bull Meadow, The Bay And Say Public House and St John's Green Primary School, among other places. Colchester has its own railway station: Colchester Town station. Other landmarks nearby include Lion Walk (less than half a mile south-east) and Essex County Hospital (within half a mile south-west). The countryside around Colchester includes Westhouse Wood.

Map of Colchester © OpenStreetMap contributors

Why deal with it now?

It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together and it means sorting access once. In flats, shops and offices in Colchester, a failed joint can let water into the unit below or behind a wall, where it can go unnoticed until the damage is done.

Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.

Why book with us

  • You choose the colour before work begins
  • Old sealant always removed completely
  • Domestic, commercial and hotel work
  • Trusted Arbo and Everbuild sealants

See our cost guide or what customers say.

FAQs for Colchester

Can you do external mastic in Colchester?

Yes, Colchester is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear price.

Is external mastic in Colchester guaranteed?

Every job comes with our 12-month guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.

Do you work for letting agents?

Yes, regularly. Several properties can be quoted together.

Should I try DIY first?

You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.

Is there any odour?

It depends on the product. Some products have a noticeable smell, others very little.

Does someone need to be in?

It depends on the job. Inside work needs someone to give us access.

What’s an expansion joint in brickwork?

A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.

Can you seal over the old sealant?

No. The old sealant always comes out first, so the new joint bonds to clean surfaces.

How it works

Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a handful of joints, longer for a whole elevation. Jobs in a place the size of Colchester range from town-centre flats to offices and family homes. Whichever it is, tell us how to get in, where to park and where the work is.

  1. First, the joints are inspected and the access agreed.
  2. Every bit of old sealant and any mortar or debris is cut out.
  3. The faces are brushed clean and primed where the product requires it.
  4. Backing rod sized to the joint goes in to set the depth.
  5. The exterior sealant is applied, tooled and checked along its length.

How to prepare

  • Try not to wet indoor joints just before the visit
  • Tell us about any previous sealing or DIY attempts
  • Move anything stored near the joints

Ask for a quote

Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or drop us an email.

Get a quick quote

Related advice

Landlords, agents and businesses in Colchester

We work for landlords and letting agents as well as householders. Sealant work between tenants keeps a property looking cared for.

From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.

20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job