Surrey · England
External Mastic in Egham
External mastic for Egham and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Moss and dirt in joints with no sealant left
- Leaking joints around cladding and façade panels
- Sealant pulling away from one side of the joint
Why act early in Egham
Resealing a run of joints in one go is generally better than patching one at a time. They’ve weathered the same way. Draughts from a gap round a frame, damp under a sill or water behind a bath panel all start small, and early is when they’re cheapest and quickest to sort.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why choose Mr Mastic in Egham
- Rated 4.9 stars on Google
- Every job guaranteed for a year
- Full insurance on every job
- Any old sealant cut out fully, not covered over
Take a look at our cost guide and customer reviews.
External mastic in Egham
Low-level joints can normally be done from the ground. For joints higher up, give us some details of the building and we’ll confirm what access is needed. If you have joints where the bead has come unstuck and joints pointed up with cement by mistake, we can help, whatever the surface.
Garage door frames, porches and roofline trims are all part of external work in a town like Egham. Where two materials meet, they move differently, and the sealant has to allow for it.
A 12-month guarantee comes as standard.
- Location
- Egham (TW20, TW18)
- Region
- Surrey
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
All our tools and materials come with us in the van. Once we’ve agreed what’s being done, the area is protected and the work begins. Most jobs take a few hours for a handful of joints, longer for a whole elevation. In Egham, parking is rarely complicated, though it helps to know about driveways or restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Mention any leaks or damp you’ve noticed
- Let us know about earlier repairs to the joints
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
Related advice
Common problems we fix in Egham
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
It’s worth asking for a quote if you see:
- Movement joints with cracked, split or missing sealant
- Gaps where render, brick and frames meet
- Weathered mastic that no longer stretches
- Leaking joints around cladding and façade panels
Letting a property close to Egham station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Comparing quotes
- Are they insured?
- Whether they seal over old material or remove it
- Whether VAT is included
- Who does the work, and how experienced they are
What affects the quote in Egham
The price is agreed before any work begins. It takes into account:
- How many areas need sealing
- The old material and how stubborn it is
- The type of sealant required
- Any working-time requirements on site
Doing several joints on one visit is normally more efficient than separate visits. You will get one clear quote for the whole job.
What we need to know
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- What’s wrong with the joints now
- The type of property
- Access, such as stairs, a lift or height
Asking for a quote is easy: let us know the job and the location. A few pictures by email make the job easier to understand, and we’ll take it from there.
How the job changes by surface
Joints between dissimilar materials
Different materials may need different primers. We prepare both faces so the sealant bonds properly.
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Places near Egham
What else we do in Egham
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
For landlords and businesses
In hotels, rooms out of use cost money, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Questions from Egham
Can you help a landlord with a rental near Egham station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear price.
Is external mastic in Egham guaranteed?
All our work, in Egham and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
What information do you need?
Tell us what needs doing and where, with photos by email if possible. If we need more, we’ll ask.
Which products do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Are you ARBOMaster approved?
Yes. We are approved under the ARBOMaster scheme.
Will you leave a mess?
We keep the work tidy. Nearby surfaces are protected.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
What external mastic looks like in Egham
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. Historic houses like Frogmore House (about 3.7 miles north-west) are a reminder that the area around Egham has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
If you look after a building such as Manorcroft Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to St John's Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Egham is about 6 miles south-east of Slough, in Surrey. Whether you’re in the middle of Egham or further out, we cover external mastic for every kind of property. Our area takes in 395 places across Surrey. Our Reading page covers work nearby.
Jobs for external mastic in TW20 and TW18 works the same way as everywhere else we cover. We cover properties on Station Road, Church Road and High Street. You will find Egham on the A30 and A308, which makes it straightforward to reach. Other places close to Egham include Englefield Green (1 mile west), Hythe End (1 mile north), Egham Hythe (1 mile east), Stroude (1 mile south) and Thorpe (2 miles south-east). Larger places within reach include Guildford (13 miles south), Woking (8 miles south), Camberley (10 miles south-west), Epsom (14 miles south-east), Ewell (14 miles south-east) and Walton-on-Thames (7 miles south-east). Egham is one of the larger places we cover in Surrey.
Local landmarks in Egham
In Egham, that means homes and buildings near Strode's College, The Railway Public House and The Magna Carta School and the streets around them. Egham has its own railway station: Egham station. Nearby you’ll also find Windsor Castle (4.5 miles north-west) and Spelthorne Museum (1.5 miles east). Green spaces nearby include St Ann's Hill and Manor Lake.