Oxfordshire · England
External & façade joints in Netherton, Oxfordshire
External mastic for Netherton and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Old sealant gone brittle and cracked
- Plants rooting in failed movement joints
- Sealant that has lost its bond to the brick or render
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
How we handle external mastic in Netherton
A movement joint is a deliberate break that lets a wall expand and contract. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. If you’re dealing with rain getting behind render or cladding at a joint and failed seals between different materials, we can help, on façade panels, concrete & block and joints between brick and frames alike.
Older homes in small places like Netherton 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 there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Netherton (OX13)
- Wider area
- Oxfordshire
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How it works
We keep the work tidy and contained to the joints we’re treating, so you can get on with your day. Expect the work to take a few hours for a handful of joints, longer for a whole elevation, and we tell you how long to leave it before we go. Somewhere like Netherton 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.
- Each joint is checked and the colour of the new sealant agreed.
- 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.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Keep pets and children clear of the area while we work
- Tell us if parking is tricky
Getting a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we will talk you through the work.
Advice
Do you need external mastic in Netherton?
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Look out for any of the following:
- Joints where the bead has come unstuck
- Brick movement joints where the sealant has split
- Failed sealant between panels on a façade
- Movement joints filled with mortar instead of sealant
Managing a site like John Blandy Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- What happens if they find a problem under the old sealant
- Who turns up on the day
- Is the old sealant removed completely?
- What the cure time is
What the job involves on each surface
Render joints
Water behind render can lead to blown patches. Resealing the joints early keeps water out and helps it last.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. We seal the joint with a flexible exterior sealant so the movement is taken up.
Walls and rooflines in Netherton
Historic houses like Appleton Manor (about 2 miles north-east) are a reminder that the area around Netherton has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as Church of St Nicholas, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Netherton is about 5 miles west of Abingdon-on-Thames, in Oxfordshire. Jobs in Netherton get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Netherton is one of 443 towns and villages in Oxfordshire where we work. We also work in Oxford, about 8 miles from Netherton.
Work in OX13 is quoted and booked the same way as anywhere else. If you are just outside Netherton, we cover Fyfield (1 mile south-east), Tubney (1 mile east), Frilford Heath (2 miles east), Frilford (2 miles south-east) and Cothill (3 miles east). Further out, we also cover Oxford (8 miles north-east), Didcot (8 miles south-east), Abingdon-on-Thames (5 miles east), Witney (8 miles north-west), Carterton (10 miles north-west) and Wantage (7 miles south).
Landmarks near Netherton
In Netherton, that means homes and buildings near The White Hart Inn. A little further out are Hinton Waldrist Castle (2.7 miles west) and Abingdon Community Hospital (4.2 miles east). For a walk, there’s Hitchcopse Pit and Cumnor Hill.
DIY sealant or a professional job?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Netherton questions
Do you cover smaller places like Netherton?
Yes. Netherton is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is external mastic in Netherton guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Will there be a smell?
Sometimes, a little. Any smell clears as the sealant cures.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we’re using.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
What is backing rod for?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides, which would stop it stretching.
Will you leave a mess?
Tidy work is part of the job. We protect what’s around the joints, and we clear up when we’re done.
What we can’t put right
New sealant cannot fix everything, and we’d rather say so up front. Sealant will not put right:
- Cracking across the wall rather than at a joint
- Structural movement, which needs a surveyor or engineer
- Failed render or damaged cladding panels
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before you book.
Joints and surfaces we work on
- Concrete & block
- Brickwork movement joints
- Render & cladding joints
- Joints between brick and frames
- Façade panels
- Copings & trims
Quotes for external mastic in Netherton
You will get a clear quote before we start. It’s based on:
- The type of sealant required
- The number and length of the joints
- How many areas need sealing
- Whether the work is at height
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first and agree the price before starting.
What we need to know
To help us quote quickly, let us know:
- How many joints, rooms or windows are involved
- The problem you’ve noticed
- Pictures of the joints, sent by email
- Whether it has been sealed before
To get a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. We will give you a clear quote before any work starts.