Kent · England
External Mastic in Postling
External mastic in Postling from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Hard, crazed mastic that has stopped moving
- Gaps where render, brick and frames meet
- Rain getting behind render or cladding at a joint
What we do, step by step
There’s no need to move everything out before we come, only the area right around the joints. Everything nearby is protected, and the job takes anything from a few hours to several days, depending on the building for a typical job. Somewhere as small as Postling, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Let us know about stairs, lifts or work at height
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
For a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
Related advice
External mastic in Postling, done properly
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing. If you’re dealing with hard, crazed mastic that has stopped moving and brick movement joints where the sealant has split, we can put it right.
External sealant needs dry, clean surfaces, so work around Postling is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
You get a 12-month guarantee, the same in Postling as everywhere else we work.
- Location
- Postling (CT21)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Should I try it myself first?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
What else we do in Postling
Your questions about external mastic in Postling
Can you help a landlord with a rental near Sandling station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Will you come out to Postling?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Will you leave a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Why is there a gap in my brick wall?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
Are you insured?
Yes, we are fully insured for every job we do.
Can you do several jobs on one visit?
Yes. Just list everything you need.
Where do you work from?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Will the new joint stand out?
The sealant colour is picked to suit the wall, so the joint sits quietly in the wall. There’s a wide choice of exterior colours.
What we can’t put right
Before booking, it’s worth knowing the limits:
- Cracking across the wall rather than at a joint
- Adding movement joints to masonry that has none
- Render that’s blown, hollow or coming away
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before booking.
What we seal
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Render & cladding joints
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep water from gutters off the wall
- Tell anyone working on the walls about the movement joints
- Get split or bare joints resealed while the damage is small
- Check external joints each spring
Keep pressure washers away from the sealant. High-pressure water can lift the edges and let water in behind.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
What happens if it’s left?
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. Older cottages and farmhouses around Postling can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Why us?
- Trusted Arbo and Everbuild sealants
- 20+ years of sealant experience
- Old sealant always removed completely
- Colour agreed with you before work begins
Read what affects the cost or our reviews.
Outside joints around Postling
Postling 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’s hard on movement joints and outside wall joints, especially on the side facing the sea. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Church of St Mary and St Radegund, older walls, gutters and the joints where extensions meet them need a flexible sealant. For landlords with property near Sandling station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. For site and facilities teams at buildings such as Brockhill Park Performing Arts College, larger buildings have long runs of movement joint that eventually need resealing.
Postling is about 3 miles north of Hythe, in Kent. If you need external mastic in Postling, please ring 0345 464 0079 or email us for a quick quote. We’re based in Crawley and cover Kent. We cover 922 towns and villages across Kent, from the larger towns to small villages. Our Chelmsford page covers work nearby, about 50 miles away.
Jobs for external mastic in CT21 is quoted and booked the same way as anywhere else. Nearby, we also carry out external mastic in Stanford (1 mile south-west), Skeete (1 mile north), Etchinghill (1 mile east), Woodland (2 miles north) and Lyminge (2 miles north-east). We also work in nearby towns such as Ashford (9 miles west), Canterbury (12 miles north), Dover (10 miles east), Folkestone (5 miles east), Hythe (3 miles south) and Tower Hamlets (10 miles east).
Near you in Postling
Locally, jobs take us to homes and businesses close to Sandling Park and the streets around them. The closest station to Postling is Sandling station, roughly 1.3 miles south. Other landmarks nearby include Elham Valley Countryside Centre And Railway Museum (2.4 miles east) and Saltwood Castle (2.1 miles south-east). The countryside around Postling includes Tolsford Hill.
Quotes for external mastic in Postling
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Any mould that needs treating
- The product the joint needs
- Working hours on commercial sites
- Whether the work is at height
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you are not sure whether it needs doing, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
What we need to know
What to tell us when you ask for a quote:
- Roughly how big the job is
- Whether it’s a home or a business
- Where the job is, and your postcode
- If someone has resealed it before
For external mastic in Postling, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before any work starts.