West Sussex · England
External & façade joints in Compton, West Sussex
External mastic across Compton and nearby, with every bit of old sealant taken out first.
- Hard, crazed mastic that has stopped moving
- Gaps where render, brick and frames meet
- Damp patches traced to an open external joint
External mastic for homes and businesses in Compton
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall so the line blends in. We work on façade panels, render & cladding joints and joints between brick and frames, and the jobs we see most are failed sealant between panels on a façade and rain getting behind render or cladding at a joint.
In a village or hamlet like Compton, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
Whatever the size of the job, it’s backed by our 12-month guarantee in Compton and across West Sussex.
- Location
- Compton (PO18)
- Wider area
- West Sussex
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Keeping the joints in good condition
Simple care keeps the joints in good condition. We recommend:
- Clear growth from the base of walls and joints
- Have failed joints looked at early
- Leave the joints unpainted unless we’ve said otherwise
- Tell anyone working on the walls about the movement joints
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal with no damage behind it to deal with.
DIY versus a professional finish
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Why deal with it now?
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and doesn’t last. Where a wall is exposed, as many are in small places like Compton, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we will go through it with you.
What you get with us
- Quality sealants from Arbo and Everbuild
- Sealant colour chosen to suit
- Any old sealant cut out fully, not covered over
- Approved under the ARBOMaster scheme
See our cost guide or customer reviews.
Honest limits
In fairness, there are a few things sealant will not fix:
- Loose or hollow render, which needs re-rendering
- Subsidence or other structural problems
- Damp that isn’t coming from the joint
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before you book.
What we seal
- Copings & trims
- Render & cladding joints
- Concrete & block
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
Places near Compton
Other services in Compton
Quotes for external mastic in Compton
Your quote is based on your job. We look at:
- When we can work, for business premises
- How easy the joints are to reach
- Which sealant suits the joint
- Mould in or behind the old joints
The cost reflects the work involved, not guesswork. That’s why we ask about the job first.
What we need to know
Before you ask for a quote, have a think about:
- Photos by email, if that is easy
- What’s wrong with the joints now
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
How the job changes by surface
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. They’re resealed over backing rod with a low-modulus sealant coloured to suit the wall.
Common questions in Compton
Will you come out to Compton?
Yes. Compton is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you help a landlord with a rental near Rowlands Castle station?
Yes. We work for landlords and letting agents as well as householders, and several properties can go on one quote. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear quote.
Do you seal joints where cladding meets other materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. The colour is chosen to suit.
Where are you based?
Mr Mastic is based in Crawley. We cover Compton and the rest of West Sussex, along with the rest of our area.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
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.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
What does external mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote and we will talk you through it.
What external mastic looks like in Compton
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Uppark (about 1.8 miles north) nearby, there’s older building stock in the area around Compton as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Schools such as Compton and Up Marden CofE Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. Rented homes near Rowlands Castle station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to The Parish Church of St Mary include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Compton is about 5 miles east of Horndean, in West Sussex. We provide external mastic to homeowners, landlords and businesses in Compton and the surrounding area. Across West Sussex, we cover 371 places, and Compton is one of them. Our Portsmouth page covers work nearby.
All of PO18 is within our area for external mastic. If you need external mastic at a property on Church Lane and School Lane or anywhere close by, we can help. Other places close to Compton include East Marden (2 miles east), South Harting (3 miles north), East Harting (3 miles north-east), Chilgrove (4 miles east) and Elsted (4 miles north-east). Larger places within reach include Bognor Regis (13 miles south-east), Chichester (8 miles south-east), Selsey (14 miles south), Emsworth (6 miles south), Portfield (9 miles south-east) and Yapton (15 miles south-east).
Near you in Compton
Locally, jobs take us to homes and businesses close to The Coach And Horses Public House. The nearest railway station is Rowlands Castle station, roughly 3.6 miles south-west. Other landmarks nearby include Petersfield Community Hospital (5.7 miles north) and Clanfield Earthwork (4 miles west). The countryside around Compton includes Kingley Vale National Nature Reserve and Compton Down.
What we do, step by step
At the end, we look at the finished work together and explain the cure time. The work normally takes anything from a few hours to several days, depending on the building, depending on how much there is to do. Somewhere as small as Compton, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Mention any parking rules near the property
- Try not to wet indoor joints just before the visit
- Let us know if you’ve seen damp or leaks
Get a quote
To get a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. We will give you a clear quote before any work starts.