East Sussex · England
External Mastic in Founthill
External mastic for Founthill and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Joints pointed up with cement by mistake
- Gaps where render, brick and frames meet
- Sealant that has lost its bond to the brick or render
How it works
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes anything from a few hours to several days, depending on the building. Somewhere like Founthill 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 look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Let us know if you’ve seen damp or leaks
- Mention any parking rules near the property
Ask for a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we will explain what’s involved.
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External mastic in Founthill, done properly
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product. If you have damp patches traced to an open external joint and gaps where render, brick and frames meet, we can put it right.
Outside joints can only be sealed when they’re dry, so work in Founthill is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Founthill (BN8)
- Region
- East Sussex
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Signs you need external mastic in Founthill
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
Keep an eye out for these signs:
- Leaking joints around cladding and façade panels
- Moss and dirt in joints with no sealant left
- Failed seals between different materials
- Movement joints filled with mortar instead of sealant
Managing a site like Newick Church of England Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
What to look for in a quote
- How hidden problems are handled
- How much experience the applicator has
- What preparation is included
- Which colour the sealant will be
Should I try it myself first?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Failed render or damaged cladding panels
- Cracked brickwork or render that needs a builder or plasterer
- Structural movement, which needs a surveyor or engineer
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly.
Joints and surfaces we work on
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Copings & trims
- Façade panels
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Wash walls gently around the sealant
- Deal with leaking gutters that soak the joints below
- Show decorators and builders where the movement joints are
- Keep soil, plants and ivy away from the joints
Do not paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint and spoil the finish.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
Founthill questions
Is Founthill within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Uckfield station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before work begins.
Are you fully insured?
Yes. Mr Mastic is fully insured.
Is the work guaranteed?
Yes. All our work carries a 12-month guarantee.
Where are you based?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we’re using and why.
How much does external mastic cost in Founthill?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
What the job involves on each surface
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joint sealant has to cope with frequent movement. The sealant is chosen with that in mind.
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best year round.
Also near Founthill
Other services in Founthill
Founthill buildings and the weather
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.
In the older streets around The Parish Church of St Mary, an extension built onto an older house moves differently, and the joint between them takes the strain. Rented homes near Uckfield station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Founthill is about 3 miles west of Uckfield, in East Sussex. Jobs in Founthill get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 289 places across East Sussex, from the larger towns to small villages. You can also see our page for Brighton, about 11 miles away.
Here we cover the BN8 postcode area for external mastic. We also cover Newick (1 mile north-west), Chailey (1 mile west), North Chailey (2 miles west), South Street (2 miles south-west) and Mount Pleasant (2 miles south). Larger places within reach include Seaford (13 miles south), Lewes (6 miles south), Hailsham (12 miles south-east), Crowborough (9 miles north-east), Uckfield (3 miles east) and Newhaven (12 miles south).
Around Founthill
In Founthill, that means homes and buildings near The Royal Oak Inn and the streets around them. Founthill’s nearest station is Uckfield station, roughly 3.3 miles east. A little further out are Uckfield Community Hospital (3.7 miles east) and Heaven Farm Museum (3.9 miles north).
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- The product the joint needs
- The number and length of the joints
- Mould in or behind the old joints
- The number of rooms or windows
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Asking for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- What’s wrong with the joints now
- If someone has resealed it before
- Photos by email, if that’s easy
- Any access issues, like height or stairs
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, phone 0345 464 0079 or send us an email.