Slough · England
Burnham Sand Mastic
Specialist sand mastic for Burnham: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Failed mastic on an exposed elevation
- Mastic round period door frames that has failed
- Open joints round the window box
Surface by surface
Period and listed homes
A traditional finish suits a period property.
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. We rake it out and renew it.
Sand mastic in Burnham, done properly
Sand mastic skins over fairly quickly but full hardening takes longer. Traditionally, sand mastic is left unpainted and we’ll advise if you’re redecorating. We work on sash and case windows, stone surrounds and timber door frames, and people most often call us about wind and rain getting in round a sash window and mastic worn away on windows facing the weather.
In smaller places like Burnham, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. Each frame material needs the right sealant against the right wall.
A one-year guarantee comes as standard, so you are covered after we have gone.
- Location
- Burnham (SL1, SL6, SL2)
- Region
- Slough
- Cover
- One year on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
FAQs for Burnham
I let a flat near Burnham station. Can you help?
Yes, we work for landlords and letting agents. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Is Burnham within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Where do you work from?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Can I paint the new mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Do I need permission for sand mastic on a listed building?
Check with your local planning authority. They decide whether consent is needed.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Can you seal over the old sealant?
No, it won’t last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
What’s sand mastic made of?
It’s sand mixed with a linseed-oil-based binder for the joint between timber frames and masonry.
Work for landlords, hotels and businesses
We also work for property managers and facilities teams in Burnham and across Slough. We can quote a run of properties together, and we are fully insured.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
When something else is needed
We’ll always be straight with you, so here’s what new sealant will not do:
- Decayed frames that need repair
- Putty and glazing repairs
- Sash cords, weights and draught-proofing of the sashes
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly before booking.
What we seal
- Stone surrounds
- Tenement windows
- Timber door frames
- Sash and case windows
- Period & listed homes
- Brick reveals
DIY sealant or a professional job?
If you do try it yourself, take your time over the 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.
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
How to look after the new joints
Aftercare is simple:
- Make sure water runs off the sill
- Get any rot dealt with first
- Ask us before painting near the mastic
- Check the mastic when you check the paintwork
Look at the mastic when you look over the windows. Small cracks are easier to deal with early.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry so early renewal protects both.
The process
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, the area is protected and the work begins. Most jobs take a few hours per window, depending on the condition of the joints. For a job in Burnham, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Tell us about any previous sealing or DIY attempts
- Let us know if you’ve seen damp or leaks
How to get a quote
To get a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. You will have a clear quote before any work starts.
Read more
What happens if it’s left?
Before painting the windows, it pays to renew the mastic. Painting over failed mastic doesn’t seal it, and the new mastic is traditionally left unpainted. Homes in smaller places like Burnham can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why Burnham customers choose us
- A 12-month guarantee on all work
- Anti-fungal sanitary silicone in wet areas
- We never seal over old sealant
- We leave the area clean and tidy
Take a look at how sealant jobs are priced and our reviews.
Nearby places to Burnham
Other services in Burnham
Frames and glazing around Burnham
With historic houses such as Dorney Court (about 1.9 miles south) nearby, there’s older building stock in the area around Burnham as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. 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.
Letting a property close to Burnham station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. In the older streets around St Peter's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Managing a site like The E-Act Burnham Park Academy? Then the mastic around its windows and doors needs looking after like any other building’s.
Burnham is about 2 miles north-west of Slough, in Slough. Anywhere in SL1, we can carry out sand mastic at your property. Across Slough, we cover 31 places, Burnham among them. You can also see our page for Reading, about 15 miles away.
All of SL1, SL6 and SL2 is covered for sand mastic. You’ll find streets such as Stomp Road, Priory Road and High Street, all of which we cover. Other places close to Burnham 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). Within a short drive, 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 among the bigger towns we cover in Slough.
Local landmarks in Burnham
We work in homes and buildings around Haymill Valley, Garibaldi Public House and Our Lady of Peace Catholic Primary and Nursery School, among other places. The closest station to Burnham is Burnham station, about 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). Green spaces nearby include Burnham Beeches and Taplow Lake.