East Sussex · England
External & façade joints in Mountfield, East Sussex
External mastic across Mountfield and nearby, with old sealant always removed completely.
- Weeds or debris growing in open joints
- Rain getting behind render or cladding at a joint
- Joints pointed up with cement by mistake
External mastic in Mountfield
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. We’re often asked to deal with plants rooting in failed movement joints and gaps where render, brick and frames meet, across façade panels, joints between brick and frames and render & cladding joints.
External sealant needs dry, clean surfaces, so work around Mountfield is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
Every job comes with our 12-month guarantee.
- Place
- Mountfield (TN32)
- Region
- East Sussex
- Guarantee
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What affects the cost of external mastic
Your quote is based on your job. We look at:
- Whether old sealant or filler has to be cut out
- The number of rooms or windows
- The amount of work
- Which sealant suits the joint
Combining jobs into one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Whether it’s a home or a business
- Photos by email, if that’s easy
- If someone has resealed it before
- Where the property is
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or send us an email.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Towns and villages near Mountfield
Also in Mountfield
Signs you need external mastic in Mountfield
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
It’s worth asking for a quote if you see:
- Joints with sealant missing in places
- Sealant that has lost its bond to the brick or render
- Rain getting behind render or cladding at a joint
- Rigid filler in a joint that should flex
Homes close to The Parish Church of All Saints include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Before booking anyone
- Whether VAT is included
- How the joint is cleaned and prepared
- What product goes in the joint
- What happens if the job turns out different
FAQs for Mountfield
Can you do external mastic in Mountfield?
Yes. Our work covers London and the South East, and Mountfield is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing.
Will you come out to Mountfield?
Yes, Mountfield is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can new sealant go over the old?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Which products do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
Do I have to be there?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
When will the joints need doing again?
That depends on the wall, the weather and the movement. Signs to watch for are cracking, hardening and gaps at the edges.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
When it is not the sealant
In fairness, some problems need a different trade:
- Render that’s blown, hollow or coming away
- Cracked brickwork or render that needs a builder or plasterer
- Subsidence or other structural problems
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly before you book.
Surfaces we seal
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Façade panels
- Concrete & block
What we do, step by step
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a few hours to a few days, depending on the length of joint and the access from start to finish. Somewhere like Mountfield needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Move anything stored near the joints
- Keep children and pets away from the work area
Getting a quote
To get a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
Read more
What happens if it’s left?
Running new sealant over the old bead rarely lasts. New sealant does not bond well to old, weathered sealant, so we always take the old sealant out. Where a wall is exposed, as many are in small places like Mountfield, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
The cost reflects the work involved, not guesswork. That is why we ask about the job first and agree the price before starting.
Why choose Mr Mastic in Mountfield
- 180+ five-star Google reviews
- We agree the colour with you first
- Full insurance on every job
- Approved under the ARBOMaster scheme
Read our cost guide or what customers say.
Landlords, agents and businesses in Mountfield
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Landlords and agents in Mountfield can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
Walls and rooflines in Mountfield
With historic houses such as Durhamford Manor (about 2 miles east) nearby, there’s older building stock in the area around Mountfield 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. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Managing a site like Vinehall School? Then its movement joints, gutters and trims need looking after like any other building’s. Rented homes near Robertsbridge station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Mountfield is about 7 miles north-west of Hastings, in East Sussex. Homes, rented property, offices and hotels in Mountfield can book us for external mastic. Every job comes with our one-year guarantee. Across East Sussex, we cover 289 places, Mountfield among them. We also work in Brighton, around 28 miles away.
All of TN32 is within our area for external mastic. Local streets include Church Road, Solomon's Lane and Eatenden Lane, all of which we cover. Close by, we work in John's Cross (1 mile north-east), Netherfield (2 miles south-west), Robertsbridge (2 miles north), Battle (2 miles south) and Northbridge Street (3 miles north). Larger places within reach include Eastbourne (14 miles south-west), Hastings (7 miles south-east), Bexhill-on-Sea (7 miles south), Hailsham (11 miles south-west), Crowborough (15 miles north-west) and St Leonards (7 miles south-east).
Local landmarks in Mountfield
We work in homes and buildings around John's Cross Public House and Robertsbridge Community College and the streets around them. Mountfield’s nearest station is Robertsbridge station, about 2.3 miles north of the centre. Other landmarks nearby include Battle Museum of Local History (2.4 miles south). Open spaces near Mountfield include Senlac Hill.