Surrey · England
Windlesham External Mastic
Professional external mastic in and around Windlesham, with old sealant always removed completely and a one-year guarantee.
- Sealant pulling away from one side of the joint
- Movement joints with cracked, split or missing sealant
- Failed seals between different materials
Windlesham: your questions answered
Is Windlesham in your area for external mastic?
Yes, Windlesham is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job.
Will you come out to Windlesham?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
How long does external mastic last?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Every job carries our 12-month guarantee.
Can you seal over the old sealant?
No, and we never do. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
Can you do several jobs on one visit?
Yes. Just list everything you need and we’ll quote it together.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
What is backing rod for?
We fit closed-cell backing rod wherever the joint depth needs controlling. It controls the depth and stops the sealant bonding to the back.
External mastic in Windlesham
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall. If you are dealing with leaking joints around cladding and façade panels and brick movement joints where the sealant has split, we can help, on joints between brick and frames, copings & trims and concrete & block alike.
Homes around Windlesham range from older cottages to newer houses, with walls and rooflines of every type. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
Our work is backed for twelve months, in Windlesham and everywhere else we cover.
- Place
- Windlesham (GU20)
- Wider area
- Surrey
- Guarantee
- A year, on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Landlords, agents and businesses in Windlesham
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will give you a quote.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
What we do, step by step
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it generally takes a few hours to a few days, depending on the length of joint and the access. For a job in Windlesham, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- 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.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we are working on
How to get a quote
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. A few pictures by email make the job easier to understand.
Related advice
What affects the cost of external mastic
There’s no set price list, because jobs vary so much. The quote depends on:
- The type of sealant required
- Any mould that needs treating
- Whether old sealant or filler has to be cut out
- When we can work, for business premises
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs. Ask us for a quote and we will go through it with you.
What we need to know
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- How we’d reach the joints
- If someone has resealed it before
- A few pictures by email, if you can
- Where the property is
We quote each job on its own, so start by telling us what you need. Just ring 0345 464 0079 or send us an email with the details.
When something else is needed
To be straight with you, some problems need a different trade:
- Cracks in the bricks or render themselves, away from the joints
- Damp that isn’t coming from the joint
- Loose or hollow render, which needs re-rendering
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before you book.
Surfaces we seal
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Concrete & block
How the job changes by surface
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. A primer goes on where the product requires one before the bead.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
Also near Windlesham
Other services in Windlesham
Why deal with it now?
Running new sealant over the old bead rarely lasts. New sealant does not bond well to old, weathered sealant, so the old joint is cut out fully first. In an older home around Windlesham, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re not sure whether it needs doing, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
Why Windlesham customers choose us
- ARBOMaster approved applicator
- Colour agreed with you before work begins
- Quality sealants from Arbo and Everbuild
- Anti-fungal sanitary silicone in wet areas
See what affects the cost and customer reviews.
Walls and rooflines in Windlesham
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.
In the older streets around Church of St John the Baptist, the joints between older walls, newer extensions and the roofline need a sealant that can move. For landlords with property near Bagshot station, outside joints that have cracked can let damp into a rental, so check them between lets.
Windlesham is about 4 miles north-east of Camberley, in Surrey. Whether you are in the middle of Windlesham or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Our Surrey coverage runs to 395 places, and Windlesham is one of them. Our Reading page covers work nearby, about 15 miles away.
Our applicators cover all of GU20 for external mastic. You will find streets such as Church Road, Finney Drive and Cooper Road, all of which we cover. We also cover the places around Windlesham: Brick Hill (1 mile east), Lightwater (1 mile south-west), Bagshot (2 miles west), Donkey Town (2 miles south) and Broomhall (2 miles north-east). Further out, we also cover Guildford (9 miles south-east), Woking (5 miles south-east), Camberley (4 miles south-west), Farnham (12 miles south-west), Egham (6 miles north-east) and Walton-on-Thames (11 miles east).
Landmarks near Windlesham
Typical jobs here are in homes near The Sun pub, Brentmoor Heath and Gordon's School, among other places. For rail, the closest station is Bagshot station, roughly 1.4 miles west of the centre. Nearby you’ll also find Chobham Museum (2.6 miles south-east) and Heatherwood Hospital (3.3 miles north-west). Green spaces nearby include Gracious Pond and Virginia Water Lake.
When to call us in Windlesham
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Any of these means the joints need attention:
- Plants rooting in failed movement joints
- Movement joints filled with mortar instead of sealant
- Leaking joints around cladding and façade panels
- Brick movement joints where the sealant has split
Schools such as Windlesham Village Infant School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- How long to leave it before use
- What preparation is included
- Who does the work, and how experienced they are
- How the colour is chosen