Hampshire · England
External & façade joints in Four Marks, Hampshire
External mastic for Four Marks and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Hard, crazed mastic that has stopped moving
- Sealant pulling away from one side of the joint
- Cracked joints where brick meets render or frames
External mastic in Four Marks, done properly
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where mortar or filler would crack. We work on concrete & block, brickwork movement joints and copings & trims, and the jobs we see most are joints pointed up with cement by mistake and failed seals between different materials.
Homes around Four Marks range from older cottages to newer houses, with walls and rooflines of every type. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Four Marks (GU34)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Why act early in Four Marks
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. Homes in smaller places like Four Marks can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
Why us?
- 20+ years of sealant experience
- Anti-fungal sanitary silicone in wet areas
- Experience in homes, commercial sites and hotels
- Tidy, careful work
Read what affects the cost or customer reviews.
Keeping the joints in good condition
Simple care keeps the joints in good condition. We recommend:
- Tell anyone working on the walls about the movement joints
- Have failed joints looked at early
- Avoid pressure-washing directly into sealant joints
- Never let anyone fill a movement joint with mortar
Avoid pressure-washing straight into the joints. 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.
Towns and villages near Four Marks
Other services in Four Marks
FAQs for Four Marks
Will you come out to Four Marks?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you cover Four Marks for external mastic?
Yes, Four Marks is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. It’s closed with backing rod and a flexible sealant.
Can you seal over the old sealant?
No, it will not last. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Can you quote for more than one area?
Yes. Just list everything you need and you will get one quote.
Should I point up the gap in my brickwork?
No. Cement or mortar cannot stretch. Where a joint has been mortared, it can often be raked out and sealed properly.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you when we finish.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
How we quote for external mastic
We quote each job individually. These are the things that affect it:
- Whether old sealant or filler has to be cut out
- The product the joint needs
- The number and length of the joints
- Any mould that needs treating
The cost depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before work begins, so you know where you stand.
Asking for a quote
To make quoting easier, let us know:
- The problem you’ve noticed
- Any previous sealing or DIY work
- Any access issues, like height or stairs
- Where the job is, and your postcode
Every job is quoted individually. Just phone 0345 464 0079 or email us with the details.
Signs you need external mastic in Four Marks
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
Any of these means the joints need attention:
- Sealant pulling away from one side of the joint
- Panel joints letting water in
- Gaps where render, brick and frames meet
- Old sealant gone brittle and cracked
In the older streets around Church of the Good Shepherd, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Questions to ask before you book
- How long to leave it before use
- Is VAT in the price?
- What happens if the job turns out different
- Whether all the old sealant comes out first
What external mastic looks like in Four Marks
With historic houses such as Bentworth Hall (about 2.7 miles north) nearby, there’s older building stock in the area around Four Marks 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. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Alton station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. If you look after a building such as Four Marks Church of England Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Four Marks is about 4 miles south-west of Alton, in Hampshire. From the centre of Four Marks to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Four Marks is one of 683 towns and villages in Hampshire we cover for external mastic. Southampton is on our list too, around 20 miles away.
Every address in GU34 is covered for external mastic, from the main roads to the quietest streets. Whether your property is on Read's Field, River Close and Chalk Close or a nearby road, our applicators can take on the job. We also cover the places around Four Marks: Medstead (1 mile north), Soldridge (1 mile west), South Town (2 miles north-west), New Copse (2 miles north) and Hattingley (2 miles north-west). Within a short drive, we also cover Basingstoke (11 miles north), Winchester (12 miles west), Fleet (15 miles north-east), Horndean (14 miles south), Alton (4 miles north-east) and Petersfield (9 miles south-east).
Around Four Marks
The closest station to Four Marks is Alton station, about 4.6 miles north-east. A little further out are Barton Castle (3.5 miles north-west) and Alton Community Hospital (3.3 miles north-east). For a walk, there’s Red Hill.
How the job changes by surface
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. We reseal them with a low-modulus sealant over backing rod in a colour to suit the brick.
Render joints
The face of render can be soft, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.
What we do, step by step
You don’t need to clear the whole room or building, only the area right around the joints. We protect the rest, and the work takes a few hours to a few days, depending on the length of joint and the access for a typical job. A visit to Four Marks 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 inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Tell us if parking is tricky
- Let us know about earlier repairs to the joints
- For business premises, tell us about site rules or sign-in
Get a quote
If you are in Four Marks and need external mastic, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
Related advice
Landlord and commercial work in Four Marks
If you manage several properties in or around Four Marks, several properties can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
We also work for property managers and facilities teams in Four Marks and across Hampshire. We can quote a run of properties together.