Surrey · England
Flexford External Mastic
Professional external mastic in and around Flexford, with old sealant always removed completely and a 12-month guarantee.
- Old sealant gone brittle and cracked
- Weeds or debris growing in open joints
- Sealant that has lost its bond to the brick or render
Why deal with it now?
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner, so it pays to do it properly once. Older cottages and farmhouses around Flexford can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
We don’t show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
Why book with us
- You choose the colour before work begins
- Full insurance on every job
- A 12-month guarantee on all work
- Tidy, careful work
How we handle external mastic in Flexford
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a colour to suit. If you are dealing with sealant that has lost its bond to the brick or render and hard, crazed mastic that has stopped moving, we can put it right, whatever the surface.
Older homes in small places like Flexford may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
All our work is covered by our 12-month guarantee.
- Location
- Flexford (GU3)
- Wider area
- Surrey
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Places near Flexford
Other services in Flexford
When something else is needed
Before booking, it’s worth knowing the limits:
- Cracks in the bricks or render themselves, away from the joints
- Loose or hollow render, which needs re-rendering
- Structural movement, which needs a surveyor or engineer
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
What we seal
- Concrete & block
- Copings & trims
- Façade panels
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
A DIY attempt does not rule out a professional job. We cut it out and start again.
Signs you need external mastic in Flexford
Sometimes a movement joint was filled with mortar or a rigid filler by mistake. The joint cannot move, so the wall cracks somewhere else instead.
The most common problems we see are:
- Sealant pulling away from one side of the joint
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
- Old sealant gone brittle and cracked
For site and facilities teams at buildings such as Wyke Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before booking
- Whether all the old sealant comes out first
- What the quote includes, VAT included or not
- How hidden problems are handled
- When the joint can take water or movement
Flexford: your questions answered
Will you come out to Flexford?
Yes, Flexford is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Wanborough station?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or email us with the details for a clear quote.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. Then ring 0345 464 0079 or drop us an email.
Do I need to be at home?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Why do you put foam in the joint first?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. That way it bonds to the two sides only and can stretch.
How long does external mastic last?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. Check them each year and reseal when they split or harden. Our work comes with a 12-month guarantee.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference.
Can a movement joint be filled with mortar?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
What we do, step by step
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes anything from a few hours to several days, depending on the building, including the tidy-up. In a small place like Flexford, access is normally 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.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Let us know if you’ve seen damp or leaks
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
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.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so the sealant in it must stay soft and stretchy.
What external mastic looks like in Flexford
With historic houses such as Wanborough Manor (about 0.8 miles south-east) nearby, there’s older building stock in the area around Flexford as well as newer homes. In older buildings, 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, 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 Bartholomew, the joints between older walls, newer extensions and the roofline need a sealant that can move. For landlords with property near Wanborough station, split movement joints are easy to miss on a rental until damp shows inside.
Flexford is about 4 miles east of Aldershot, in Surrey. We provide external mastic to householders, landlords and businesses in Flexford and the surrounding area. Our area takes in 395 places across Surrey. We also work in Reading, around 19 miles away.
Every address in GU3 is within our area for external mastic, from the main roads to the quietest streets. Streets in the area include Christmaspie Avenue, Orchard Close and Cull's Road, all of which we cover. If you are just outside Flexford, we cover Christmas Pie (1 mile south), Wanborough (1 mile south-east), Normandy (1 mile north), Willey Green (1 mile north-east) and Wyke (1 mile north-west). Further out, we also cover Guildford (4 miles east), Woking (7 miles north-east), Camberley (7 miles north), Farnham (6 miles south-west), Egham (14 miles north-east) and Walton-on-Thames (15 miles north-east).
Near you in Flexford
In Flexford, that means homes and buildings near Ash Manor School, among other places. There’s a railway station in Flexford itself: Wanborough station. A little further out are Guildford Hospital (2.6 miles east) and Guildford Castle (4.3 miles east). Open spaces near Flexford include Ash Ranges and Hog's Back.
How we quote for external mastic
For a quick quote, just ask. The main things that affect it are:
- The number and length of the joints
- Any mould that needs treating
- The type of sealant required
- The number of rooms or windows
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first and give you a clear price before we start.
What we need to know
What to tell us when you ask for a quote:
- The rough size of the job
- Where the job is, and your postcode
- A few photos by email, if you can
- What’s wrong with the joints now
If you’re in Flexford and need external mastic, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.