Hampshire · England
External & façade joints in Sherborne St John, Hampshire
Specialist external mastic for Sherborne St John: careful preparation, the right product and tidy work. Call for a quick quote.
- Weeds or debris growing in open joints
- Water getting into walls through failed joints
- Failed seals between different materials
Sherborne St John questions
Is Sherborne St John in your area for external mastic?
Yes, Sherborne St John is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Do you cover smaller places like Sherborne St John?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Will the new joint stand out?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render so it does not stand out.
I’m a tenant. Can you help?
Yes, but check with your landlord or agent first. Landlords are often happy for the work to be arranged.
Do you use backing rod?
We fit closed-cell backing rod wherever the joint depth needs controlling. It sets the sealant depth and prevents three-sided bonding so the bead can stretch.
Can you seal over the old sealant?
No, it won’t last. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
How long does external mastic take?
A typical job takes anything from a few hours to several days, depending on the building, including the preparation. We will confirm how long when we quote.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
About our external mastic in Sherborne St John
Low-level joints can usually be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what access is needed. Common call-outs are for hard, crazed mastic that has stopped moving and plants rooting in failed movement joints, across copings & trims, concrete & block and render & cladding joints.
Around Sherborne St John, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water generally gets in, and they need the right sealant at the right depth.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Sherborne St John (RG24)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What we cannot put right
A few problems are outside what sealant work can do:
- Movement that’s more than a sealant joint can take
- Walls that need new movement joints cut into them
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Joints between brick and frames
- Façade panels
- Concrete & block
- Copings & trims
- Brickwork movement joints
- Render & cladding joints
Landlord and commercial work in Sherborne St John
If you manage several properties in or around Sherborne St John, several properties can be quoted together. Send us the addresses and the work at each.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will give you a quote.
What we are called out for in Sherborne St John
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. The joint cannot move, so the wall cracks somewhere else instead.
The problems people generally mention when they call are:
- Rain getting behind render or cladding at a joint
- Failed seals between different materials
- Sealant that has lost its bond to the brick or render
- Hard, crazed mastic that has stopped moving
Rented homes near Basingstoke station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What to look for in a quote
- Are they insured?
- What happens if the job turns out different
- How long the guarantee is
- How the surfaces are prepared before sealing
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Keep soil, plants and ivy away from the joints
- Avoid pressure-washing directly into sealant joints
- Look over the joints every year, ideally after winter
- Keep movement joints as flexible joints, not mortar
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick which cost more to put right than the joint.
What affects the cost of external mastic
The price is agreed before any work begins. It takes into account:
- The type of sealant required
- Whether the work is at height
- How many areas need sealing
- The size of the job
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- The address or postcode of the job
- Whether it has been sealed before
- Roughly how big the job is
- The type of property
For a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. You’ll have a clear quote before work begins.
Nearby places to Sherborne St John
Other services in Sherborne St John
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
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.
Sherborne St John buildings and the weather
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as The Vyne (about 1.2 miles north-east) nearby, there’s older building stock in the area around Sherborne St John as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Managing a site like Sherborne St John Church of England Primary School? Then its movement joints, gutters and trims need looking after like any other building’s. In the older streets around Church of St. Andrew, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Sherborne St John is about 2 miles north of Basingstoke, in Hampshire. Whether you are in the middle of Sherborne St John or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. 683 places in Hampshire are on our list, large and small. Our Reading page covers work nearby, about 12 miles away.
We work across the RG24 postcode area for external mastic and the streets around it. Streets in the area include Cranes Road, Bourne Field and Church Path. We also cover the places around Sherborne St John: Rooksdown (1 mile south-west), Winklebury (2 miles south), Basingstoke (2 miles south), Worting (3 miles south-west) and South Ham (3 miles south). We also work in nearby towns such as Farnborough (15 miles east), Fleet (12 miles east), Aldershot (15 miles east), Alton (12 miles south-east), Yateley (12 miles east) and Tadley (4 miles north).
Local landmarks in Sherborne St John
In Sherborne St John, that means homes and buildings near Everest Community Academy and the streets around them. The closest station to Sherborne St John is Basingstoke station, roughly 2.1 miles south-east of the centre. Nearby you’ll also find Basing House (3.1 miles south-east) and Basingstoke and North Hampshire Hospital (1.1 miles south). Green spaces nearby include Daneshill Park Woods.
How it works
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. Once we’ve agreed what’s being done, we protect the area and start. It normally takes anything from a few hours to several days, depending on the building. In a small place like Sherborne St John, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- 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.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about earlier repairs to the joints
Ask for a quote
Every job is quoted individually. Just call 0345 464 0079 or send us an email with the details.