Medway · England

External & façade joints in Rochester, Medway

We cover Rochester for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.

  • Rain getting behind render or cladding at a joint
  • Hard, crazed mastic that has stopped moving
  • Sealant that has lost its bond to the brick or render

Trusted external mastic in Rochester

External mastic for homes and businesses in Rochester

Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we will confirm what’s needed to reach them safely. We work on concrete & block, joints between brick and frames and render & cladding joints, and common reasons people get in touch are sealant pulling away from one side of the joint and plants rooting in failed movement joints.

In a town like Rochester, older houses with traditional gutters sit alongside newer estates with uPVC rooflines and rendered walls. All of those joints move, so they need a flexible sealant rather than a rigid filler.

The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.

Location
Rochester (ME2, ME1, ME3, ME4)
Region
Medway
Guarantee
A year, on every job
Quote
Quoted before any work starts
Phone
0345 464 0079
Last updated
26 October 2026
The Mr Mastic team in navy uniforms in front of three Mr Mastic vans

What external mastic looks like in Rochester

Rochester is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on movement joints and outside wall joints, especially on the side facing the sea. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.

Letting a property close to Rochester station? Then outside joints that have cracked can let damp into a rental, so check them between lets. Schools such as Rochester Riverside Church of England Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.

Rochester is about 27 miles east of London, in Medway. Rochester gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 68 places across Medway, large and small. Chelmsford is on our list too, around 24 miles away.

Work in ME2, ME1, ME3 and ME4 works the same way as everywhere else we cover. We cover properties on High Street, Gundolph Square and Station Road. You will find Rochester on the A2 and A226, which makes it straightforward to reach with everything needed for external mastic. We also cover the places around Rochester: Strood (1 mile west), Borstal (1 mile south-west), Cuxton (2 miles south-west), Lower Bush (3 miles west) and North Halling (3 miles south-west). Within a short drive, we also cover Gillingham (4 miles east), Chatham (3 miles south-east), Rainham (5 miles south-east), Park Wood (5 miles south-east), Lordswood (4 miles south-east) and Twydall (4 miles east). Rochester is one of the larger places we cover in Medway.

Local landmarks in Rochester

We work in homes and buildings around Former Ordnance Store At Chatham Gun Wharf, Fort Pitt Grammar School and Broomhill Park and the streets around them. You will also find Temple School (1.2 miles north) and Royal Crown Hotel (within half a mile east). Rochester has its own railway station: Rochester station. Other landmarks nearby include Rochester Castle (within half a mile east) and Huguenot Museum (within half a mile east). The countryside around Rochester includes Gad's Hill and Rede Common.

Map of Rochester © OpenStreetMap contributors

Different surfaces, different methods

Joints between dissimilar materials

Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.

Concrete and blockwork

Big joints in concrete need careful depth control. Backing rod sized to the joint sets it so the sealant is not too deep.

What affects the cost of external mastic

For a quick quote, just ask. What matters most is:

  • Whether there’s mould to deal with
  • The old material and how stubborn it is
  • The number of rooms or windows
  • Which sealant suits the joint

No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.

What we need to know

The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:

  • What the problem is, such as mould, gaps, leaks or cracking
  • Pictures of the joints, sent by email
  • How many joints, rooms or windows are involved
  • Any previous sealing or DIY work

The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.

Keeping the joints in good condition

To keep the joints looking good and working properly:

  • Never let anyone fill a movement joint with mortar
  • Walk round the building once a year and look at the joints
  • Keep soil, plants and ivy away from the joints
  • Wash walls gently around the sealant

Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.

If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.

How it works

All our tools and materials come with us in the van. After a quick look at the joints together, we protect the area and start. Most jobs take a few hours for a handful of joints, longer for a whole elevation. For a job in Rochester, we need access to where the work is and somewhere nearby to park. If the job is outside, mention gates, side access and anything above ground floor.

  1. We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
  2. Old sealant and any debris are cut and raked out.
  3. We clean both faces of the joint and prime them where the product calls for it.
  4. We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
  5. The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.

Before we arrive

  • Plan for the work area to be out of bounds to pets and children
  • Where the joints are inside, avoid wetting them before we arrive
  • Move anything stored near the joints

How to get a quote

Getting a quote is simple: tell us what needs doing and where. A few pictures by email make the job easier to understand, and we’ll take it from there.

Get a price

Advice

For landlords and businesses

A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.

If you manage several properties in or around Rochester, several properties can be quoted together. Send us the addresses and the work at each, and photos by email help.

Rochester: your questions answered

Is external mastic in a coastal place like Rochester any different?

Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. Walls facing the sea are usually the first to need attention.

Can you help a landlord with a rental near Rochester station?

Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.

Will the new joint stand out?

Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We pick the one that suits your wall best so it does not stand out.

Does someone need to be in?

If the work is inside, we need someone to let us in. After that, you can carry on with your day.

Do you take out the old sealant first?

Yes, every time. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.

Do you have insurance?

Yes. We are fully insured, with over 20 years’ experience in sealant work.

Where is Mr Mastic based?

Our base is Crawley. Our area covers South East England, London and Scotland.

Will there be a smell?

Sometimes, a little. Any smell clears as the sealant cures.

Why act early in Rochester

Water gets in through a failed movement joint, behind render and cladding. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. In a family home in Rochester, a failed seal around a bath or a frame lets water into places you can’t see, such as under the floor, behind a panel or into a wall. Left alone, that means rot, damp and a bigger repair.

A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.

Why us?

  • Trusted Arbo and Everbuild sealants
  • Homes, businesses and hotels
  • Sanitary silicone with an anti-fungal additive in wet areas
  • Every job guaranteed for a year

Read our cost guide and what customers say.

Signs you need external mastic in Rochester

Using the wrong sealant is another common reason. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, so it pulls away from the edges.

Most people get in touch when they notice something like this:

  • Gaps where render, brick and frames meet
  • Panel joints letting water in
  • Rigid filler in a joint that should flex
  • Plants rooting in failed movement joints

Homes close to Church of St Nicholas include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.

Comparing quotes

  • What the cure time is
  • How the surfaces are prepared before sealing
  • Whether you can choose the colour
  • Which sealant they’ll use, and why

Choosing a sealant specialist

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