Surrey · England
External Mastic in Byfleet
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Byfleet and across Surrey. Fully insured, ARBOMaster approved and guaranteed for a year.
- Damp patches traced to an open external joint
- Panel joints letting water in
- Gaps where render, brick and frames meet
External mastic in Byfleet, done properly
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. If you are dealing with movement joints filled with mortar instead of sealant and rain getting behind render or cladding at a joint, we can put it right, whatever the surface.
Homes around Byfleet range from older cottages to newer houses, with walls and rooflines of every type. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Byfleet (KT14)
- Wider area
- Surrey
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Byfleet questions
Can you do external mastic in Byfleet?
Yes. We work across London and the South East, and Byfleet is part of that. Just call 0345 464 0079 or email us with a few details of the job.
I let a flat near Byfleet & New Haw station. Can you help?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Where are you based?
We work from Crawley. Our applicators cover Byfleet.
Are you fully insured?
Yes. We are fully insured.
Can you seal over the old sealant?
No, and we never do. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
How long before the joint can be used?
It depends on the product and the conditions. Before we leave, we’ll tell you the cure time.
How long will you be here?
It depends on the size of the job, but most jobs take anything from a few hours to several days, depending on the building. We’ll give you a better idea when we quote.
What sealant work can’t fix
New sealant can’t fix everything, and we’d rather say so up front. It will not solve:
- Cracking across the wall rather than at a joint
- Loose or hollow render, which needs re-rendering
- Cutting new joints into brickwork, which is building work rather than sealant work
If you are not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer before booking.
Surfaces we seal
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
- Concrete & block
- Render & cladding joints
Walls and rooflines in Byfleet
With historic houses such as Byfleet Manor (about 0.6 miles south-east) nearby, there’s older building stock in the area around Byfleet as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Church of St Mary the Virgin, old and new materials meet at the roofline and walls, which is where sealant earns its keep. For site and facilities teams at buildings such as St Mary's CofE Controlled Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Byfleet is about 3 miles south-west of Weybridge, in Surrey. Byfleet gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our Surrey coverage runs to 395 places, and Byfleet is one of them. London is on our list too, around 20 miles away.
We cover every part of KT14 for external mastic and the streets around it. We cover properties on Church Road, High Road and Binfield Road. We also cover Wisley (1 mile south), New Haw (1 mile north-west), Brooklands (1 mile north), Pyrford Green (2 miles south-west) and St George's Hill (2 miles north-east). We also work in nearby towns such as Guildford (8 miles south-west), Woking (5 miles west), Camberley (11 miles west), Epsom (9 miles east), Redhill (15 miles south-east) and Ewell (9 miles east).
What’s near Byfleet
In Byfleet, that means homes and buildings near Blue Anchor Hotel, Fullbrook School and Manor Farm and the streets around them. Byfleet’s nearest station is Byfleet & New Haw station, roughly 0.8 miles north of the centre. Well-known places in the area include Runnymede Hospital (3.5 miles north-west) and Send and Ripley History Society Museum (2.9 miles south). For a walk, there’s Papercourt Marshes and St Ann's Hill.
Other services in Byfleet
Should I try it myself first?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
What we are called out for in Byfleet
Some movement joints have been pointed up with mortar. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Common reasons people contact us include:
- Water getting into walls through failed joints
- Rigid filler in a joint that should flex
- Panel joints letting water in
- Weathered mastic that no longer stretches
Rented homes near Byfleet & New Haw station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What your quote should include
- How the surfaces are prepared before sealing
- Which sealant they’ll use, and why
- Whether they seal over old material or remove it
- What guarantee comes with the work
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. Around Byfleet, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why choose Mr Mastic in Byfleet
- Full insurance on every job
- We never seal over old sealant
- Approved under the ARBOMaster scheme
- Sanitary silicone with an anti-fungal additive in wet areas
See what affects the cost or our reviews.
How the job changes by surface
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.
What happens on the day
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours to a few days, depending on the length of joint and the access. A visit to Byfleet is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Mention any parking rules near the property
- Mention any tricky access
- Keep children and pets away from the work area
Ask for a quote
We quote each job on its own, so the first step is telling us about yours. Simply ring 0345 464 0079 or email us and describe the job.
Related advice
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Keep high-pressure jets off the joints
- Deal with leaking gutters that soak the joints below
- Don’t let climbing plants root in the sealant
- Show decorators and builders where the movement joints are
Don’t paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Small splits are the time to act. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.