Buckinghamshire · England
External Mastic in Edgcott
External mastic in Edgcott from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weeds or debris growing in open joints
- Joints with sealant missing in places
- Damp patches traced to an open external joint
How we handle external mastic in Edgcott
Joints in render and cladding are easy to overlook until a damp patch appears. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a matching colour. We are often asked to deal with hard, crazed mastic that has stopped moving and sealant that has lost its bond to the brick or render, across concrete & block, render & cladding joints and brickwork movement joints.
Outside joints can only be sealed when they’re dry, so work in Edgcott is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Where
- Edgcott (HP18)
- Region
- Buckinghamshire
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. We prime where the sealant needs it before the bead.
What affects the cost of external mastic
Your quote is based on your job. We look at:
- Any mould that needs treating
- Which sealant suits the joint
- When we can work, for business premises
- The number and length of the joints
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Asking for a quote
What to tell us when you ask for a quote:
- Access, such as stairs, a lift or height
- The problem you’ve noticed
- The type of property
- Any previous sealing or DIY work
We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or send us an email with the details and send photos if you have them.
External mastic in Edgcott: local notes
Historic houses like Claydon House (about 3 miles north-east) are a reminder that the area around Edgcott 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. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as Grendon Underwood Combined School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Edgcott is about 6 miles east of Bicester, in Buckinghamshire. Across the HP18 area, we cover external mastic for homes and businesses. Edgcott is one of 263 towns and villages in Buckinghamshire where we work. There’s also a page for Oxford, about 14 miles away.
Here we cover the HP18 postcode area for external mastic. We cover properties on Buckingham Road, St Michaels Close and Lawn House Lane and the roads around them. Neighbouring places we cover for external mastic include Grendon Underwood (1 mile south), Ludgershall (3 miles south), Blackthorn (4 miles south-west), Piddington (4 miles south-west) and Brill (6 miles south). Within a short drive, we also cover Aylesbury (10 miles south-east), Buckingham (7 miles north), Elmhurst (10 miles south-east), Southcourt (11 miles south-east), Princes Risborough (14 miles south-east) and Haydon Hill (9 miles south-east).
Landmarks near Edgcott
The countryside around Edgcott includes Calvert Jubilee.
Nearby places to Edgcott
Other services in Edgcott
When it isn’t the sealant
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Cracks in the bricks or render themselves, away from the joints
- Structural movement, which needs a surveyor or engineer
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before booking.
Surfaces we seal
- Brickwork movement joints
- Concrete & block
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
Edgcott questions
Is Edgcott within the area you cover?
Yes. Edgcott 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.
What guarantee comes with external mastic in Edgcott?
All our work, in Edgcott and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
What is a movement joint?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you.
Can landlords and businesses book you?
Yes. We work for homeowners, landlords, letting agents, businesses and hotels.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Have failed joints looked at early
- Never let anyone fill a movement joint with mortar
- Do not let climbing plants root in the sealant
- Show decorators and builders where the movement joints are
Only paint over the joint if we’ve confirmed the sealant can take paint. Many exterior sealants aren’t designed to be painted.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years.
How the visit works
The work is kept neat and contained to the joints we are treating, so you can get on with your day. The job normally takes a few hours for a handful of joints, longer for a whole elevation, and we explain the cure time before we leave. In a small place like Edgcott, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Tell us if parking is tricky
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
To get a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. You will have a clear quote before work begins.
Related advice
What we are called out for in Edgcott
Some movement joints have been pointed up with mortar by mistake. The joint can’t move, so the wall cracks somewhere else instead.
Any of these means the joints need attention:
- Movement joints filled with mortar instead of sealant
- Sealant that has lost its bond to the brick or render
- Water getting into walls through failed joints
- Weeds or debris growing in open joints
In the older streets around Church of St Michael, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Questions to ask before booking
- Whether all the old sealant comes out first
- How the surfaces are prepared before sealing
- What product goes in the joint
- What happens if the job turns out different
DIY sealant or a professional job?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
If you’re 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.