Hampshire · England
External Mastic in Medstead
Professional external mastic in and around Medstead, with old sealant always removed completely and a 12-month guarantee.
- Moss and dirt in joints with no sealant left
- Weathered mastic that no longer stretches
- Water getting into walls through failed joints
About our external mastic in Medstead
On houses, flats and commercial buildings across Medstead, we reseal joints in brickwork, render, cladding and façade panels. Every joint gets the same careful preparation: clean, sound faces and a controlled depth. We’re often asked to deal with water getting into walls through failed joints and hard, crazed mastic that has stopped moving, across concrete & block, façade panels and copings & trims.
In and around Medstead, older properties sit alongside newer ones, each with its own outside joints. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
Each job carries a 12-month guarantee, whatever its size.
- Place
- Medstead (GU34)
- Region
- Hampshire
- Cover
- A year, on every job
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.
External mastic in Medstead: local notes
With historic houses such as Bentworth Hall (about 2.1 miles north) nearby, there’s older building stock in the area around Medstead 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.
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. If you look after a building such as Medstead Church of England Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Medstead is about 4 miles south-west of Alton, in Hampshire. Wherever you are in the GU34 postcode area, our applicators can take on external mastic. Medstead is one of 683 towns and villages in Hampshire we cover for external mastic. Our Southampton page covers work nearby.
Our applicators cover all of the GU34 postcode area for external mastic. Whether your property is on High Street, Five Ash Road and Stoney Lane or a nearby road, we can help. Neighbouring places we cover for external mastic include Four Marks (1 mile south), South Town (1 mile north-west), Soldridge (1 mile south-west), New Copse (1 mile north) and Hattingley (2 miles north-west). We also work in nearby towns such as Basingstoke (10 miles north), Winchester (12 miles west), Fleet (14 miles north-east), Horndean (15 miles south), Alton (4 miles north-east) and Petersfield (9 miles south-east).
Around Medstead
The nearest railway station is Alton station, about 4.4 miles north-east. Other landmarks nearby include Barton Castle (3 miles north-west) and Alton Community Hospital (3.1 miles north-east). Not far away are Red Hill.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the 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.
Keeping the joints in good condition
Aftercare is simple, and it makes a real difference:
- Deal with leaking gutters that soak the joints below
- Check external joints each spring
- Never let anyone fill a movement joint with mortar
- Keep soil, plants and ivy away from the joints
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
For landlords and businesses
Landlords and letting agents in Medstead can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
For anyone letting property in or around Medstead, several properties can go on one quote. Send us the addresses and the work at each, and pictures by email help.
Signs you need external mastic in Medstead
Weeds, moss and debris in a joint are a sign the sealant has gone. Dirt and roots then trap moisture in the joint and make things worse.
Most people get in touch after spotting something like this:
- Sealant that has lost its bond to the brick or render
- Plants rooting in failed movement joints
- Movement joints with cracked, split or missing sealant
- Hard, crazed mastic that has stopped moving
Rented homes near Alton station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Comparing quotes
- Is VAT in the price?
- What guarantee comes with the work
- How hidden problems are handled
- Who does the work, and how experienced they are
Common questions in Medstead
Do you cover smaller places like Medstead?
Yes, Medstead is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you cover Medstead for external mastic?
Yes. We work across London and the South East, and Medstead is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
What is a movement joint?
A vertical gap in a long brick wall is usually a movement joint. It gives the wall room to move, and it should be sealed with a flexible sealant.
Can you seal joints between render and window frames?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
Can new sealant go over the old?
No. The old sealant always comes out first.
Is the work guaranteed?
Yes, always. There’s a 12-month guarantee on every job.
Can you match the colour of my brickwork?
The sealant colour is picked to suit the wall so the joint blends in. Exterior sealants come in a good range of colours.
Why do you put foam in the joint first?
That is backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only so it can flex with the joint.
Why deal with it now?
Resealing a run of joints in one go is usually better than patching one at a time. Joints of the same age tend to fail together. In an older home around Medstead, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before we start, so you know where you stand.
Why us?
- A choice of colours where the product allows
- A 12-month guarantee on all work
- 180+ five-star Google reviews
- Domestic, commercial and hotel work
See what affects the cost and what customers say.
What happens on the day
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes a few hours for a handful of joints, longer for a whole elevation, depending on the size of the job. In a smaller place like Medstead, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Clear items away from the joints we’re working on
- Mention any sign-in or site rules at work premises
- Keep children and pets away from the work area
Ask for a quote
Want a quote for external mastic? Please ring 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.