Oxfordshire · England
External Mastic in Longcot
External mastic across Longcot and nearby, with every bit of old sealant taken out first.
- Old sealant gone brittle and cracked
- Leaking joints around cladding and façade panels
- Failed seals between different materials
How the visit works
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 Longcot needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. 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.
Before we arrive
- Let us know about stairs, lifts or work at height
- Plan for the work area to be out of bounds to pets and children
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
We quote each job on its own, so start by telling us what you need. Simply ring 0345 464 0079 or send us an email and describe the job and send pictures if you have them.
Advice
How we handle external mastic in Longcot
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement. If you have cracked joints where brick meets render or frames and sealant pulling away from one side of the joint, we can help.
In a village or hamlet like Longcot, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
You’re covered for a year from the day we finish. If anything isn’t right with it, ring 0345 464 0079 or email us.
- Location
- Longcot (SN7)
- Region
- Oxfordshire
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What happens if it’s left?
Resealing a run of joints in one go is usually better than patching one at a time. They’ve weathered the same way, and access only has to be arranged once. Where a wall is exposed, as many are in small places like Longcot, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why Longcot clients choose us
- Neat joints and a tidy finish
- Fully insured
- Homes, businesses and hotels
- Colour picked to suit the job
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Common problems we fix in Longcot
The wrong product in a moving joint is a classic cause. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
Look out for these signs:
- Weeds or debris growing in open joints
- Failed sealant between panels on a façade
- Water getting into walls through failed joints
- Sealant that has lost its bond to the brick or render
For an older house near a landmark such as Church of St Mary, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Comparing quotes
- Whether they seal over old material or remove it
- What happens if they find a problem under the old sealant
- How much experience the applicator has
- The length of the guarantee
Towns and villages near Longcot
Other services in Longcot
Longcot: your questions answered
Is there a guarantee on external mastic in Longcot?
All our work, in Longcot and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Is Longcot in your area for external mastic?
Yes, Longcot is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or send us an email and let us know what needs doing, and we will send you a clear quote.
Do you seal joints where cladding meets other materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. The colour is chosen to suit.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we are done.
How long before the joint can be used?
That depends on the sealant used, so please follow the time we give you.
Do I have to be there?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
Why is there a gap in my brick wall?
Walls move with heat, cold and moisture, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
Longcot buildings and the weather
Historic houses like Buscot Park (about 4.1 miles north-west) are a reminder that the area around Longcot has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. 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.
Managing a site like Longcot and Fernham Church of England Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Longcot is in Oxfordshire. If you need external mastic in Longcot, please call 0345 464 0079 or drop us an email for a quick quote. We are based in Crawley and cover Oxfordshire. We cover 443 towns and villages across Oxfordshire, from the larger towns to small villages. You can also see our page for Oxford, roughly 19 miles from Longcot.
All of SN7 is covered for external mastic. Whether your property is on The Green, Church Close and Hughes Crescent or a nearby road, our applicators can take on the job. Neighbouring places we cover for external mastic include Fernham (1 mile north-east), Little Coxwell (2 miles north), Great Coxwell (2 miles north), Woolstone (2 miles south-east) and Uffington (2 miles south-east). Larger places within reach include Abingdon-on-Thames (15 miles east), Witney (13 miles north-east), Carterton (10 miles north), Wantage (8 miles east), Grove (8 miles east) and Faringdon (3 miles north).
Near you in Longcot
Around Longcot, our work takes us to homes and buildings near Bricklayers Arms and Faringdon Community College. Other landmarks nearby include Faringdon Day Hospital (2.9 miles north) and Uffington Museum (2.1 miles south-east). Green spaces nearby include Badbury Hill.
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
How the job changes by surface
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap and keep the sealant to the right depth.
When it is not the sealant
In fairness, some problems need a different trade:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Render that is blown, hollow or coming away
- Cracks in the bricks or render themselves, away from the joints
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before booking.
Surfaces we seal
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Joints between brick and frames