Windsor and Maidenhead · England
External Mastic in Dorney
Sealing brickwork movement joints, render, cladding and façade joints for Dorney, backed by a one-year guarantee. Ask us for a quote.
- Joints pointed up with cement by mistake
- Leaking joints around cladding and façade panels
- Joints where the bead has come unstuck
What the job involves on each surface
Copings and trims
A failed coping joint lets water into the top of the wall. Sealing them early saves the wall below.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.
External mastic in Dorney
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing, and we don’t skip that step. We are often asked to deal with hard, crazed mastic that has stopped moving and sealant pulling away from one side of the joint, across copings & trims, render & cladding joints and concrete & block.
Outside joints can only be sealed when they’re dry, so work in Dorney is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
There’s a 12-month guarantee on every job, whatever its size.
- Location
- Dorney (SL4)
- Region
- Windsor and Maidenhead
- Cover
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Questions from Dorney
Is Dorney within the area you cover?
Yes. Dorney is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is Dorney in your area for external mastic?
Yes, Dorney is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
Do you have insurance?
Yes. Mr Mastic is fully insured.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you don’t need to watch us work.
How do I get a quote for external mastic in Dorney?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You will get a clear quote before work begins.
How do you reach high-level joints?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher work, tell us about the building and we’ll confirm what’s needed.
Do the sealants smell?
There can be a smell while the sealant cures, which fades as it sets. Opening a window helps.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area.
Nearby places to Dorney
What else we do in Dorney
What external mastic looks like in Dorney
Historic houses like Dorney Court (about 0.5 miles west) are a reminder that the area around Dorney 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. 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.
Letting a property close to Burnham station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies. For an older house near a landmark such as Church of St James, an extension built onto an older house moves differently, and the joint between them takes the strain.
Dorney is about 2 miles north-west of Windsor, in Windsor and Maidenhead. Jobs in Dorney get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Across Windsor and Maidenhead, we cover 57 places, Dorney among them. There’s also a page for Reading, about 14 miles away.
Postcode districts we cover here for external mastic: SL4. Local streets include Common Road, Village Road and Boveney Road, and we cover them all. Neighbouring places we cover for external mastic include Lake End (1 mile north-west), Dorney Reach (1 mile west), Cippenham (1 mile north-east), Huntercombe (1 mile north) and Bray (2 miles west). We also work in nearby towns such as Maidenhead (4 miles west), Boyn Hill (4 miles west), North Ascot (6 miles south), Cookham (5 miles north-west), Furze Platt (4 miles north-west) and Broomhall (8 miles south).
What’s near Dorney
Around Dorney, our work takes us to homes and buildings near The Westgate School, Sutherland Grange and Westgate School and the streets around them. For rail, the closest station is Burnham station, roughly 1.4 miles north of the centre. A little further out are Upton Hospital (2.7 miles east) and The History On Wheels Museum (1.2 miles east). Open spaces near Dorney include Bray Pit and Taplow Lake.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Act on the first splits you see
- Keep soil, plants and ivy away from the joints
- Avoid pressure-washing directly into sealant joints
- Never let anyone fill a movement joint with mortar
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
A joint that has stopped moving pushes the movement elsewhere, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
What we do, step by step
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself normally takes anything from a few hours to several days, depending on the building, depending on the amount of work. Somewhere as small as Dorney, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Mention any leaks or damp you’ve noticed
- Let us know about stairs, lifts or work at height
Getting a quote
Every job is quoted individually. Just phone 0345 464 0079 or drop us an email with the details and send photos if you have them.
Related advice
DIY versus a professional finish
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Signs you need external mastic in Dorney
If plants are growing out of a joint, the sealant has usually failed or was never there. Roots and dirt hold water against the wall.
Most people get in touch after spotting something like this:
- Weathered mastic that no longer stretches
- Movement joints with cracked, split or missing sealant
- Movement joints filled with mortar instead of sealant
- Plants rooting in failed movement joints
Managing a site like Western House Academy? Then larger buildings have long runs of movement joint that eventually need resealing.
What to look for in a quote
- How the joint is cleaned and prepared
- Whether VAT is included
- What the cure time is
- Who turns up on the day
Honest limits
We will not take on work that will not last, so here’s what sealant can’t put right:
- Cracks in the bricks or render themselves, away from the joints
- Walls that need new movement joints cut into them
- Rising or penetrating damp from elsewhere in the wall
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think.
Where we work in Dorney
- Copings & trims
- Concrete & block
- Brickwork movement joints
- Render & cladding joints
- Façade panels
- Joints between brick and frames