Oxfordshire · England
Fernham External Mastic
External mastic for Fernham and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Sealant that has lost its bond to the brick or render
- Cracked joints where brick meets render or frames
- Old sealant gone brittle and cracked
Your questions about external mastic in Fernham
Is external mastic in Fernham guaranteed?
All our work, in Fernham and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
Is Fernham within the area you cover?
Yes, we do. Our work covers 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 hold any approvals?
Yes. We are approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Should I point up the gap in my brickwork?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures.
Can tenants book the work?
Of course. Ask your landlord first, and we can send them the quote if that helps.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
Will the new joint stand out?
We choose a sealant colour to suit the brick, stone or render. Exterior sealants come in a good range of colours.
About our external mastic in Fernham
Low-level joints can normally be done from the ground. For joints higher up, give us some details of the building and we will confirm what access is needed. We work on façade panels, render & cladding joints and copings & trims, and people most often call us about old sealant gone brittle and cracked and movement joints with cracked, split or missing sealant.
Older homes in small places like Fernham may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water usually gets in.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we will put it right.
- Where
- Fernham (SN7)
- Region
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How the job changes by surface
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it or an approved alternative. Send us any details you have about the façade.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
Nearby places to Fernham
Also in Fernham
Common problems we fix in Fernham
Sometimes a movement joint was filled with mortar or a rigid filler, often by someone who didn’t know what it was for. The joint can’t move, so the wall cracks somewhere else instead.
The most common problems we see are:
- Joints where the bead has come unstuck
- Gaps where render, brick and frames meet
- Leaking joints around cladding and façade panels
- Rain getting behind render or cladding at a joint
In the older streets around Church of St John, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Before booking anyone
- What the cure time is
- Whether they’re fully insured
- Whether the sealant suits the joint
- Whether VAT is included
What we do, step by step
We bring everything the job needs with us. 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. Somewhere like Fernham needs a little journey planning: let us know about lanes, gates and parking. 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.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Keep pets and children clear of the area while we work
- Mention any leaks or damp you’ve noticed
- Try not to wet indoor joints just before the visit
Get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
For landlords and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Quotes for external mastic in Fernham
There’s no set price list. What we look at:
- Whether there’s mould to deal with
- Access and height
- Whether old sealant or filler has to be cut out
- When we can work, for business premises
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and give you a clear price before we start.
What to tell us for a quote
To help us quote quickly, let us know:
- What’s wrong with the joints now
- Whether it’s a home or a business
- Pictures of the joints, sent by email
- The address or postcode of the job
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
Honest limits
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Rising or penetrating damp from elsewhere in the wall
- Render that’s blown, hollow or coming away
- Adding movement joints to masonry that has none
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
Where we work in Fernham
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Façade panels
- Copings & trims
- Joints between brick and frames
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Do not let climbing plants root in the sealant
- Check external joints each spring
- Never let anyone fill a movement joint with mortar
- Leave the joints unpainted unless we’ve said otherwise
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
Fernham buildings and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Buscot Park (about 4.3 miles north-west) nearby, there’s older building stock in the area around Fernham as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
For site and facilities teams at buildings such as Faringdon Community College, larger buildings have long runs of movement joint that eventually need resealing.
Fernham is about 7 miles west of Wantage, in Oxfordshire. Anywhere in SN7, our applicators can take on external mastic. Fernham is one of 443 places in Oxfordshire where we work for external mastic. We also work in Oxford, around 17 miles away.
Our applicators cover all of the SN7 postcode area for external mastic. We cover properties on High Street, Church Lane and The Green and the roads around them. Nearby, we also carry out external mastic in Little Coxwell (1 mile north-west), Baulking (2 miles south-east), Uffington (2 miles south-east), Shellingford (2 miles north-east) and Faringdon (2 miles north). We also work in nearby towns such as Didcot (14 miles east), Abingdon-on-Thames (13 miles east), Witney (12 miles north), Carterton (10 miles north), Wantage (7 miles east) and Grove (7 miles east).
What’s near Fernham
Nearby you’ll also find Faringdon Castle (2.4 miles north) and Uffington Museum (1.8 miles south). The countryside around Fernham includes Badbury Hill.