Windsor and Maidenhead · England
Chavey Down External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Chavey Down and across Windsor and Maidenhead. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Moss and dirt in joints with no sealant left
- Damp patches traced to an open external joint
- Hard, crazed mastic that has stopped moving
External mastic in Chavey Down
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. If you’re dealing with movement joints with cracked, split or missing sealant and rigid filler in a joint that should flex, we can put it right, whatever the surface.
Outside joints can only be sealed when they’re dry, so work in Chavey Down is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
Your job is guaranteed for a year, as with all our work.
- Location
- Chavey Down (SL5)
- Region
- Windsor and Maidenhead
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Why it’s worth doing now in Chavey Down
Sealing over the top of old mastic does not hold for long. New sealant does not bond well to old, weathered sealant, so the old joint is cut out fully first. Older cottages and farmhouses around Chavey Down can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we will explain what it covers.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- Quality sealants from Arbo and Everbuild
- We leave the area clean and tidy
- Anti-fungal silicone where joints get wet
Take a look at our cost guide or what customers say.
Towns and villages near Chavey Down
Other services in Chavey Down
Keeping the joints in good condition
Aftercare is simple:
- Keep soil, plants and ivy away from the joints
- Get split or bare joints resealed while the damage is small
- Check external joints each spring
- Avoid pressure-washing directly into sealant joints
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
How it works
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it normally takes anything from a few hours to several days, depending on the building. For a village or hamlet like Chavey Down, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Keep pets and children clear of the area while we work
- Clear the area around the work
- On commercial sites, let us know about site rules
How to get a quote
We do not publish a price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To get started, ring 0345 464 0079 or send us an email.
Advice
What affects the cost of external mastic
Your quote is based on your job. We take into account:
- The old material and how stubborn it is
- When we can work, for business premises
- The size of the job
- Mould in or behind the old joints
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Helping us quote
To make quoting easier, please include:
- What’s wrong with the joints now
- A few pictures by email, if you can
- Roughly how big the job is
- Whether it’s a home or a business
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, call 0345 464 0079 or send us an email.
Honest limits
It helps to know what we can’t do too:
- Movement that is more than a sealant joint can take
- Cracked brickwork or render that needs a builder or plasterer
- Render that is blown, hollow or coming away
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Copings & trims
- Render & cladding joints
- Concrete & block
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
External mastic in Chavey Down: local notes
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as St Leonard's Hill (about 4.3 miles north-east) nearby, there’s older building stock in the area around Chavey Down 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.
Homes close to St Martin's Church include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Chavey Down is about 2 miles east of Bracknell, in Windsor and Maidenhead. Whether you are in the middle of Chavey Down or further out, external mastic is available for homes and businesses alike. Chavey Down is one of 57 towns and villages in Windsor and Maidenhead we cover. There’s also a page for Reading, about 12 miles away.
We work across SL5 for external mastic. You’ll find streets such as Church Road, North Road and Long Hill Road. Neighbouring places we cover for external mastic include Warfield Park (1 mile north-west), Winkfield Row (1 mile north), Martins Heron (1 mile south-west), Bullbrook (1 mile west) and Whitegrove (1 mile north-west). We also work in nearby towns such as Maidenhead (7 miles north), Windsor (5 miles north-east), Boyn Hill (6 miles north), Cookham (10 miles north), Furze Platt (8 miles north) and Dedworth (5 miles north-east).
What’s near Chavey Down
We work in homes and buildings around Garth Hill College and Whitegrove Primary School, among other places. The nearest railway station is Martins Heron station, about 1 mile south-west. Other landmarks nearby include The Lexicon (1.7 miles west) and Heatherwood Hospital (1.1 miles south-east). Not far away are Virginia Water Lake.
What we’re called out for in Chavey Down
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
Keep an eye out for any of the following:
- Joints with sealant missing in places
- Water getting into walls through failed joints
- Rigid filler in a joint that should flex
- Sealant that has lost its bond to the brick or render
Rented homes near Martins Heron 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
- What insurance they hold
- How the joint is cleaned and prepared
- What product goes in the joint
- Is the old sealant removed completely?
Chavey Down questions
Can you do external mastic in Chavey Down?
Yes, Chavey Down is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing.
Do you cover smaller places like Chavey Down?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Where are you based?
Our base is Crawley. We work across South East England, London and Scotland.
Do you work for letting agents?
Yes, often. Several properties can go on one quote.
Can you reach joints on upper floors?
It depends on the building. We work on joints that can be reached safely. Tell us about the building and we will confirm what access is needed.
Is it OK to seal over old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Can you match the colour of my brickwork?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We choose the closest to your brick or render so the joint does not draw the eye.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses, and we’re fully insured.
DIY sealant or a professional job?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.