Kent · England
External Mastic in Hextable
Specialist external mastic for Hextable: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Joints pointed up with cement by mistake
- Joints where the bead has come unstuck
- Plants rooting in failed movement joints
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
How we handle external mastic in Hextable
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. Typical jobs include sealant that has lost its bond to the brick or render and hard, crazed mastic that has stopped moving, across copings & trims, brickwork movement joints and joints between brick and frames.
Outbuildings, garages and conservatories around homes in places like Hextable add more joints to look after. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
All our work comes with a one-year guarantee, wherever you are in Kent.
- Place
- Hextable (BR8, DA2)
- Wider area
- Kent
- Cover
- A year, on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in Hextable
Do you cover Hextable for external mastic?
Yes. Our work covers London and the South East, and Hextable is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Do you work for landlords with property near Swanley station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
What do you put in the joint?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we are using.
How long does external mastic take?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer, and we will tell you how long to expect.
Why is there a gap in my brick wall?
A vertical gap in a long brick wall is normally a movement joint. It lets the bricks expand without cracking and needs a flexible seal, not mortar.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator and we’re fully insured too.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Can you quote for more than one area?
Yes, and it often makes sense. Doing several areas at once is usually more efficient.
Landlord and commercial work in Hextable
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Ask before painting over external sealant
- Show decorators and builders where the movement joints are
- Never let anyone fill a movement joint with mortar
- Fix overflowing gutters above sealed joints
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
What we can’t put right
We’ll always be straight with you, so here’s what new sealant won’t do:
- Loose or hollow render, which needs re-rendering
- Damp that isn’t coming from the joint
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly.
What we seal
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
- Copings & trims
What happens on the day
At the end, we look at the finished work together and explain the cure time. The visit itself normally takes a few hours for a handful of joints, longer for a whole elevation, depending on the amount of work. A visit to Hextable is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- 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.
- The faces are brushed clean and primed where the product requires 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
- Let us know about parking restrictions
- Tell us about any previous sealing or DIY attempts
- On commercial sites, let us know about site rules
How to get a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job, and we’ll come back to you with a quote.
Read more
Hextable buildings and the weather
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Hall Place and Gardens (about 2.7 miles north) nearby, there’s older building stock in the area around Hextable as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
If you let a flat or house near Swanley station, outside joints that have cracked can let damp into a rental, so check them between lets. For site and facilities teams at buildings such as Hextable Primary School, larger buildings have long runs of movement joint that eventually need resealing. For an older house near a landmark such as St Peter, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Hextable is about 3 miles south-west of Dartford, in Kent. Homes, rented property, offices and hotels in Hextable can book us for external mastic, old or new, large or small. The work is guaranteed for a year. Hextable is one of 922 towns and villages in Kent where we work for external mastic. For nearby work, see our London page.
All of BR8 and DA2 is covered for external mastic, from the main roads to the quietest streets. Streets in the area include Panter's, Southbank and Plantation Road, all of which we cover. With the B258 close by, Hextable is easy for our applicators to reach for external mastic. We also cover the places around Hextable: Puddledock (1 mile north-west), Swanley Village (1 mile south-east), Stonehill Green (1 mile west), Joyden's Wood (1 mile north-west) and Wilmington (1 mile north). Larger places within reach include Dartford (3 miles north-east), Sevenoaks (9 miles south), Gravesend (9 miles east), Tonbridge (15 miles south), Northfleet (7 miles east) and Kings Hill (14 miles south-east).
Near you in Hextable
Typical jobs here are in homes near The Ship pub, Dartford Heath and Hextable School and the streets around them. For rail, the closest station is Swanley station, roughly 1.5 miles south-west. Nearby you’ll also find Broadway Shopping Centre (3.4 miles north-west) and Dartford Library (2.6 miles north-east). Open spaces near Hextable include Wansunt Pit.
What happens if it’s left?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render, so the damage spreads beyond the joint. Homes in smaller places like Hextable can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
What you get with us
- Sanitary silicone with an anti-fungal additive in wet areas
- White, clear, grey or another colour, product permitting
- Arbo and Everbuild products
- 4.9 on Google from 180+ five-star reviews
See how sealant jobs are priced and our reviews.
Nearby places to Hextable
Also in Hextable
How we quote for external mastic
Jobs vary more than people expect. The main factors:
- Mould in or behind the old joints
- The number of rooms or windows
- Which sealant suits the joint
- The amount of work
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we will go through it with you.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Whether it’s a home or a business
- Where the property is
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
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, and email pictures if that’s easy.