Slough · England
Burnham External Mastic
Specialist external mastic for Burnham: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Brick movement joints where the sealant has split
- Failed seals between different materials
- Rigid filler in a joint that should flex
External mastic in Burnham
Low-level joints can usually be done from the ground. For joints higher up, give us some details of the building and we’ll confirm what’s needed to reach them safely. We work on joints between brick and frames, façade panels and render & cladding joints, and common reasons people get in touch are brick movement joints where the sealant has split and joints pointed up with cement by mistake.
Houses in smaller places like Burnham can stand more in the open than those in a built-up town, and walls and rooflines facing the weather take the worst of it. That is where gutter joints and wall joints tend to fail first.
Our work is backed for twelve months, in Burnham and everywhere else we cover.
- Where
- Burnham (SL1, SL6, SL2)
- Region
- Slough
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Burnham
Is Burnham in your area for external mastic?
Yes, Burnham is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Will you come out to Burnham?
Yes. Burnham is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Do you work at height?
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 will confirm what’s needed.
Do you use backing rod?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses, and we are fully insured.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used.
Nearby places to Burnham
More services for Burnham
Can I do it myself?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Why deal with it now?
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. Around Burnham, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
What it costs depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before any work starts, so you know where you stand.
Why Burnham customers choose us
- 4.9 on Google from 180+ five-star reviews
- More than 20 years in sealant work
- You choose the colour before work begins
- Fully insured
Read how sealant jobs are priced and customer reviews.
Common problems we fix in Burnham
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
Look out for any of the following:
- Joints with sealant missing in places
- Old sealant gone brittle and cracked
- Damp patches traced to an open external joint
- Sealant pulling away from one side of the joint
Managing a site like The E-Act Burnham Park Academy? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before booking
- What insurance they hold
- What preparation is included
- Who does the work, and how experienced they are
- What guarantee comes with the work
How the visit works
When we arrive, we look over the joints with you first. Surfaces next to the work are protected before work begins. The work usually takes a few hours to a few days, depending on the length of joint and the access. A visit to Burnham is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- Let us know if you’ve seen damp or leaks
- Clear the area around the work
- Mention any parking rules near the property
Getting a quote
Need a quote? Please call 0345 464 0079 or email us with a few details. We’ll explain what we’d do and send you a clear quote before any work starts.
Read more
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Keep soil, plants and ivy away from the joints
- Ask before painting over external sealant
- Point out the joints to other trades
- Avoid pressure-washing directly into sealant joints
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Act while the splits are small. At that stage it’s a simple cut out and reseal.
What affects the cost of external mastic
There’s no set price list. The quote depends on:
- The number and length of the joints
- Mould in or behind the old joints
- Whether old sealant or filler has to be cut out
- The product the joint needs
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we will explain the quote if you ask.
Asking for a quote
Before you ask for a quote, have a think about:
- What’s wrong with the joints now
- Pictures of the joints, sent by email
- How we’d reach the joints
- Any previous sealing or DIY work
If you are in Burnham and need external mastic, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
Outside joints around Burnham
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Dorney Court (about 1.9 miles south) are a reminder that the area around Burnham 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.
For an older house near a landmark such as St Peter's Church, an extension built onto an older house moves differently, and the joint between them takes the strain. For landlords with property near Burnham station, outside joints that have cracked can let damp into a rental, so check them between lets.
Burnham is about 2 miles north-west of Slough, in Slough. Homes, rented property, offices and hotels in Burnham can book us for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. Burnham is one of 31 places in Slough where we work. For nearby work, see our Reading page.
We cover every part of the SL1, SL6 and SL2 postcode area for external mastic. Whether your property is on Stomp Road, Priory Road and High Street or a nearby road, our applicators can take on the job. Neighbouring places we cover for external mastic include Huntercombe (1 mile south), Hitchambury (1 mile west), Taplow (1 mile west), Cippenham (1 mile south-east) and Rose Hill (1 mile north-west). Further out, we also cover Chalvey (3 miles south-east), Langley (5 miles east), Upton (3 miles south-east), Datchet (5 miles south-east), Stoke Poges (3 miles east) and Ditton (5 miles south-east). Burnham is one of the larger places we cover in Slough.
Landmarks near Burnham
Around Burnham, our work takes us to homes and buildings near Haymill Valley, Garibaldi Public House and Our Lady of Peace Catholic Primary and Nursery School and the streets around them. Burnham’s nearest station is Burnham station, roughly 0.7 miles south-east. Well-known places in the area include The Reitlinger Bequest Museum (1.9 miles west) and Windsor Castle (4 miles south-east). For a walk, there’s Burnham Beeches and Taplow Lake.
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.