Kent · England
External Mastic in Deal
Sealing brickwork movement joints, render, cladding and façade joints for Deal, backed by a 12-month guarantee. Ask us for a quote.
- Joints where the bead has come unstuck
- Failed seals between different materials
- Rain getting behind render or cladding at a joint
External mastic in Deal, done properly
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall so the joint does not stand out. If you have rain getting behind render or cladding at a joint and movement joints with cracked, split or missing sealant, we can help, on joints between brick and frames, render & cladding joints and brickwork movement joints alike.
Deal mixes older houses and their gutters with newer estates of brick, render and uPVC trims. Gutter joints, fascia trims and the movement joints in newer brickwork all need sealant that can flex.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Where
- Deal (CT14)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Surface by surface
Render joints
Render is weaker at the surface than brick, so a sealant that stretches easily protects the edges. We prime where the product needs it.
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Deal questions
Can you help a landlord with a rental near Deal station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before any work starts.
Can you do external mastic in Deal?
Yes, Deal is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing.
Do I have to be there?
It depends on the job. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
How long does the job take?
That depends on how much there is to do, but as a guide it takes a few hours to a few days, depending on the length of joint and the access. We will give you a better idea when we quote.
Can new sealant go over the old?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Treat it as a maintenance item and look at it yearly and renew it when it starts to fail.
How do I get a quote for external mastic in Deal?
Every job is different, so each one gets its own quote. To get one, ring 0345 464 0079 or drop us an email with a short description of the job.
What do you put in the joint?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
What external mastic looks like in Deal
Deal is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. Historic houses like Walmer Castle (about 1.2 miles south) are a reminder that the area around Deal has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Rented homes near Deal station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. For site and facilities teams at buildings such as Castle Community College, its movement joints, gutters and trims need looking after like any other building’s.
Deal is about 14 miles east of Canterbury, in Kent. Homes, rented property, offices and hotels in Deal can book us for external mastic. Every job comes with our 12-month guarantee. 922 places in Kent are on our list, from the larger towns to small villages. We also work in Chelmsford, about 53 miles from Deal.
Here we cover the CT14 postcode area for external mastic. We cover properties on London Road, Forelands Square and Herschell Square. With the A258 and B2056 close by, Deal is easy for our applicators to reach for external mastic. Nearby, we also carry out external mastic 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). Within a short drive, we also cover 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).
What’s near Deal
Typical jobs here are in homes near Betteshanger Park, Brickmakers Arms and Deal Parochial Church of England Primary School, among other places. For rail, the closest station is Deal station, about 0.5 miles north-east. A little further out are Kent Museum of the Moving Image (0.6 miles north-east) and Deal Castle (0.5 miles east).
What we are called out for in Deal
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. The joint cannot move, so the wall cracks somewhere else instead.
The problems people usually mention when they call are:
- Gaps where render, brick and frames meet
- Failed sealant between panels on a façade
- Old sealant gone brittle and cracked
- Moss and dirt in joints with no sealant left
For an older house near a landmark such as St Saviour's, older walls, gutters and the joints where extensions meet them need a flexible sealant.
What your quote should include
- Whether they’re fully insured
- Whether they seal over old material or remove it
- How the colour is chosen
- How long the guarantee is
How the visit works
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take anything from a few hours to several days, depending on the building. A visit in Deal needs access to the work and a place to park close by. For outside work, let us know about side access, gates and any upper-floor joints.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Tell us if parking is tricky
- Plan for the work area to be out of bounds to pets and children
- Clear items away from the joints we are working on
Ask for a quote
For external mastic in Deal, ring 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Read more
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Loose or hollow render, which needs re-rendering
- Cracks in the bricks or render themselves, away from the joints
- Subsidence or other structural problems
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer before you book.
Surfaces we seal
- Joints between brick and frames
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Concrete & block
- Copings & trims
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- Access and height
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
- How much there is to do
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- Pictures of the joints, sent by email
- Roughly how big the job is
- Any previous sealing or DIY work
- If it’s domestic, commercial or a hotel
For a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.