Kent · England
External & façade joints in Cranbrook, Kent
External mastic across Cranbrook and nearby, with every bit of old sealant taken out first.
- Sealant that has lost its bond to the brick or render
- Movement joints filled with mortar instead of sealant
- Panel joints letting water in
External mastic in Cranbrook
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement. If you are dealing with panel joints letting water in and brick movement joints where the sealant has split, we can put it right, whatever the surface.
Around Cranbrook, garages, outbuildings and extensions all add to the joints on the outside of a home. Leaks normally start at a gutter end, a garage door frame or where an extension meets the house.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- Cranbrook (TN17, TN18)
- Region
- Kent
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What external mastic looks like in Cranbrook
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as Congregational Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Cranbrook is about 12 miles south of Maidstone, in Kent. We carry out external mastic for homes and businesses in Cranbrook and the surrounding area, as part of our work across Kent. We cover 922 towns and villages across Kent, from the larger towns to small villages. We also work in Crawley, around 31 miles away.
Work in TN17 and TN18 is quoted and booked the same way as anywhere else. That includes homes and businesses on High Street, Crane Lane and White Lion Yard and the roads around them. We also cover Baker's Cross (1 mile east), Coursehorn (1 mile east), Swattenden (1 mile south), Hartley (1 mile south-west) and Gill's Green (3 miles south-west). Further out, we also cover Maidstone (12 miles north), Ashford (15 miles east), Royal Tunbridge Wells (12 miles west), Tonbridge (13 miles north-west), Kings Hill (13 miles north-west) and Foley Park (13 miles north).
Near you in Cranbrook
We work in homes and buildings around The Crown Public House, Crane Valley and Cranbrook Church of England Primary School, among other places. A little further out are Sissinghurst Castle (2.5 miles north-east) and Benenden Hospital (3.6 miles east).
Different surfaces, different methods
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
Copings and trims
Coping and trim joints face rain and sun head on. Each is resealed with a weatherproof, flexible sealant.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
A DIY attempt does not rule out a professional job. We cut it out and start again.
Common questions in Cranbrook
Is Cranbrook within the area you cover?
Yes. Cranbrook is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Cranbrook for external mastic?
Yes, Cranbrook is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear price.
Can you seal joints between render and window frames?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
What does external mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
Do you hold any approvals?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises. Working times can be discussed when we quote.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Are you insured?
Yes. Full insurance covers our work.
Keeping the joints in good condition
Aftercare is simple:
- Walk round the building once a year and look at the joints
- Avoid pressure-washing directly into sealant joints
- Check the sealant is paintable before painting near it
- Have failed joints looked at early
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
Towns and villages near Cranbrook
Other services in Cranbrook
Signs you need external mastic in Cranbrook
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
Common reasons people contact us include:
- Cracked joints where brick meets render or frames
- Weeds or debris growing in open joints
- Joints where the bead has come unstuck
- Movement joints with cracked, split or missing sealant
For site and facilities teams at buildings such as Cranbrook School, larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- How much experience the applicator has
- Whether the sealant suits the joint
- What insurance they hold
- When the joint can take water or movement
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
How the visit works
We keep the work tidy and contained to the joints we’re treating, so you can carry on as normal. The job generally takes a few hours to a few days, depending on the length of joint and the access, and we explain the cure time before we leave. Parking around Cranbrook is normally 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 start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Tell us about any water getting in
- Try not to wet indoor joints just before the visit
- Let us know about earlier repairs to the joints
Getting a quote
Every job is quoted individually. Simply phone 0345 464 0079 or drop us an email and describe the job.
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Why it’s worth doing now in Cranbrook
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. Around Cranbrook, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Ask us for a quote and we’ll go through it with you.
Why choose Mr Mastic in Cranbrook
- 4.9 on Google from 180+ five-star reviews
- Experience in homes, commercial sites and hotels
- Full insurance on every job
- A sealant colour to suit the surroundings