Kent · England
External Mastic in Sandwich
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Sandwich. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Moss and dirt in joints with no sealant left
- Brick movement joints where the sealant has split
- Gaps where render, brick and frames meet
Questions from Sandwich
I let a flat near Sandwich station. Can you help?
Yes. We work for letting agents and landlords as well as householders, and several properties can be quoted together. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear price.
Does living near the coast affect external mastic in Sandwich?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Where do you work from?
Our base is in Crawley, West Sussex, and we work across South East England, London and Scotland.
Do you seal joints where cladding meets other materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so the joint between them must be flexible. The sealant is matched to both sides.
What do you need from me for a quote?
The location, the problem and the rough size of the job. Photos by email help too.
Can you quote for more than one area?
Yes. Just list everything you need.
Why do you put foam in the joint first?
That’s backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only so it can flex with the joint.
About our external mastic in Sandwich
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we’ll confirm what access is needed. We’re often asked to deal with sealant pulling away from one side of the joint and gaps where render, brick and frames meet, across concrete & block, render & cladding joints and façade panels.
Around Sandwich, garages, outbuildings and extensions all add to the joints on the outside of a home. Leaks usually start at a gutter end, a garage door frame or where an extension meets the house.
We stand behind the work with a 12-month guarantee, so you’re not left on your own once the job is done.
- Where
- Sandwich (CT13)
- Region
- Kent
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Places near Sandwich
What else we do in Sandwich
Landlords, agents and businesses in Sandwich
For anyone letting property in or around Sandwich, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
We work for landlords and letting agents as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Aftercare tips
After the cure time, these simple habits help:
- Keep high-pressure jets off the joints
- Keep water from gutters off the wall
- Walk round the building once a year and look at the joints
- Clear growth from the base of walls and joints
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Act while the splits are small. Then it’s a straightforward cut-out and reseal.
Sandwich buildings and the weather
Sandwich is within about 3 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on movement joints and outside wall joints, especially on the side facing the sea. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Sandwich station? Then outside joints that have cracked can let damp into a rental, so check them between lets. Schools such as Sandwich Infant School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Sandwich is about 5 miles north-west of Deal, in Kent. Sandwich gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our Kent coverage runs to 922 places, Sandwich among them. You can also see our page for Chelmsford, roughly 49 miles from Sandwich.
Here we cover the CT13 postcode area for external mastic. Streets in the area include Cattle Market, Market Street and High Street. We also cover Great Stonar (1 mile north), Felderland (1 mile south), Worth (1 mile south), Woodnesborough (1 mile south-west) and Statenborough (1 mile south-west). We also work in nearby towns such as Canterbury (11 miles west), Margate (8 miles north), Dover (10 miles south), Folkestone (15 miles south-west), Ramsgate (5 miles north-east) and Broadstairs (7 miles north-east).
Landmarks near Sandwich
Locally, jobs take us to homes and businesses close to Ham Fen, Sir Roger Manwood's School and The Red Cow Public House and the streets around them. There’s a railway station in Sandwich itself: Sandwich station. Other landmarks nearby include The Precinct Toy Collection (within half a mile north) and Ramsgate General Hospital (5 miles north-east). Not far away are Monk's Wall nature reserve.
Signs you need external mastic in Sandwich
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
Any of these means the joints need attention:
- Joints where the bead has come unstuck
- Movement joints filled with mortar instead of sealant
- Failed sealant between panels on a façade
- Gaps where render, brick and frames meet
For an older house near a landmark such as Sandwich United Reformed Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Before you book anyone
- How long to leave it before use
- How much experience the applicator has
- What happens if they find a problem under the old sealant
- How the surfaces are prepared before sealing
What affects the quote in Sandwich
Call for a quick quote. The main things that affect it are:
- Access and height
- The product the joint needs
- The number and length of the joints
- Any working-time requirements on site
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and give you a clear quote before we start.
Helping us quote
To help us quote quickly, let us know:
- Access, such as stairs, a lift or height
- The address or postcode of the job
- Photos by email, if that’s easy
- The rough size of the job
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. When it suits you, phone 0345 464 0079 or email us.
What happens on the day
On the day, we start by going over the job with you, so you know exactly what we are doing. Surfaces next to the work are protected before work begins. The work normally takes a few hours to a few days, depending on the length of joint and the access. Parking around Sandwich is generally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- For business premises, tell us about site rules or sign-in
- Let us know about stairs, lifts or work at height
Ask for a quote
To get a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Advice
Leave it or put it right?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. In a smaller place like Sandwich, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
The cost depends on the amount of work, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
Why us?
- Rated 4.9 stars on Google
- We agree the colour with you first
- White, clear, grey or coloured to suit, where the product allows
- We leave the area clean and tidy