Oxfordshire · England
External Mastic in Gosford
Professional external mastic in and around Gosford, with every bit of old sealant taken out first.
- Leaking joints around cladding and façade panels
- Joints where the bead has come unstuck
- Cracked joints where brick meets render or frames
About our external mastic in Gosford
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. Typical jobs include weathered mastic that no longer stretches and damp patches traced to an open external joint, on concrete & block, render & cladding joints and copings & trims.
External sealant needs dry, clean surfaces, so work around Gosford is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
There’s a 12-month guarantee on every job.
- Where
- Gosford (OX5)
- Wider area
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
When we arrive, we look over the joints with you first. Surfaces next to the work are protected before any work begins. Most jobs take anything from a few hours to several days, depending on the building. Somewhere as small as Gosford, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Keep children and pets away from the work area
- Clear items away from the joints we’re working on
- Let us know about earlier repairs to the joints
How to get a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we will take it from there.
Related advice
How we quote for external mastic
We quote each job individually. This is what makes a difference:
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
- Mould in or behind the old joints
- The product the joint needs
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What we need to know
Before you ask for a quote, have a think about:
- Any access issues, like height or stairs
- The type of property
- What’s wrong with the joints now
- If someone has resealed it before
If you’re in Gosford and need external mastic, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
How the job changes by surface
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
Render joints
The face of render can be soft, so a sealant that stretches easily protects the edges. We prime where the product needs it.
Landlord and commercial work in Gosford
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
We work for landlords and agents as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
What else we do in Gosford
What sealant work cannot fix
We’d rather tell you now than do work that won’t last, so these are the limits:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Failed render or damaged cladding panels
- Structural movement, which needs a surveyor or engineer
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Copings & trims
- Façade panels
- Brickwork movement joints
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
Gosford questions
Can you help a landlord with a rental near Oxford Parkway station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Is Gosford within the area you cover?
Yes. Gosford is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Do the sealants smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
How long does external mastic take?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer, and we’ll tell you how long to expect.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
When will the joints need doing again?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. Check them each year and reseal when they split or harden. Every job carries our one-year guarantee.
Will you leave a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Outside joints around Gosford
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Holywell Manor (about 4.1 miles south) nearby, there’s older building stock in the area around Gosford as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
Rented homes near Oxford Parkway station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to Saint John the Baptist Hall Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Gosford is about 5 miles north of Oxford, in Oxfordshire. Gosford gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Our area takes in 443 places across Oxfordshire, large and small.
Our applicators cover all of OX5 for external mastic and the streets around it. We also cover Kidlington (1 mile north-west), Islip (2 miles north-east), Hampton Poyle (2 miles north), Bletchingdon (3 miles north) and Enslow (3 miles north). We also work in nearby towns such as Oxford (5 miles south), Didcot (14 miles south), Bicester (8 miles north-east), Abingdon-on-Thames (9 miles south), Witney (10 miles west) and Carterton (14 miles west).
Local landmarks in Gosford
Typical jobs here are in homes near Gosford Hill School and Kings Arms Public House And Attached Mounting Block and the streets around them. The closest station to Gosford is Oxford Parkway station, roughly 0.7 miles south of the centre. Other landmarks nearby include Acland Hospital (3.6 miles south) and Oxford Castle (4.3 miles south). For a walk, there’s Hook Meadow and The Trap Grounds and Headington Hill.
What happens if it’s left?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. A stiffer product can damage the joint edge as it fails. Older cottages and farmhouses around Gosford can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, 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
- Colour picked to suit the job
- Old sealant always removed completely
- Sanitary silicone with an anti-fungal additive in wet areas
- White, clear, grey or another colour, product permitting
Take a look at how sealant jobs are priced or customer reviews.
Signs you need external mastic in Gosford
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, so it pulls away from the edges.
Signs it’s time to call us include:
- Brick movement joints where the sealant has split
- Sealant pulling away from one side of the joint
- Failed sealant between panels on a façade
- Plants rooting in failed movement joints
Managing a site like Edward Feild Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
What your quote should include
- What happens if they find a problem under the old sealant
- What insurance they hold
- How much experience the applicator has
- Whether VAT is included