Windsor and Maidenhead · England
External & façade joints in Windsor, Windsor and Maidenhead
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Windsor and across Windsor and Maidenhead. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Weathered mastic that no longer stretches
- Leaking joints around cladding and façade panels
- Rain getting behind render or cladding at a joint
Do you need external mastic in Windsor?
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Signs it’s time to call us include:
- Weathered mastic that no longer stretches
- Joints pointed up with cement by mistake
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
Managing a site like St Edward's Catholic First School? Then larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before you book
- What insurance they hold
- What the cure time is
- What guarantee comes with the work
- Is the old sealant removed completely?
How we handle external mastic in Windsor
Low-level joints can usually be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what access is needed. Common call-outs are for water getting into walls through failed joints and gaps where render, brick and frames meet, on render & cladding joints, brickwork movement joints and façade panels.
In a town like Windsor, older houses with traditional gutters sit alongside newer estates with uPVC rooflines and rendered walls. Gutter joints, fascia trims and the movement joints in newer brickwork all need sealant that can flex.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Place
- Windsor (SL4)
- Wider area
- Windsor and Maidenhead
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Outside joints around Windsor
With historic houses such as St Leonard's Hill (about 1 mile south-west) nearby, there’s older building stock in the area around Windsor as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. 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.
For landlords with property near Windsor & Eton Central station, outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as All Saints Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Windsor is about 3 miles south of Slough, in Windsor and Maidenhead. Every kind of property in Windsor can book us for external mastic. Every job comes with our one-year guarantee. Windsor is one of 57 places in Windsor and Maidenhead where we work. There’s also a page for Reading, roughly 15 miles from Windsor.
All of SL4 is within our area for external mastic. If you need external mastic at a property on Athlone Square, Leigh Square and Furness Square or a nearby road, we can help. You’ll find Windsor on the A308 and A332, so it’s easy for us to get to with everything needed for external mastic. Nearby, we also carry out external mastic in Clewer (1 mile north), Dedworth (1 mile west), Boveney (1 mile north-west), Eton Wick (1 mile north) and Oakley Green (1 mile west). Further out, we also cover Maidenhead (5 miles north-west), Boyn Hill (5 miles north-west), North Ascot (5 miles south-west), Cookham (7 miles north-west), Furze Platt (6 miles north-west) and Broomhall (6 miles south). Windsor is among the bigger towns we cover in Windsor and Maidenhead.
Local landmarks in Windsor
In Windsor, that means homes and buildings near The Prince Albert pub, Windsor Girls' School and Sutherland Grange. The nearest railway station is Windsor & Eton Central station, roughly 1 mile north-east of the centre. Well-known places in the area include Berkshire Yeomanry Museum (1 mile south-east) and Windsor Castle (1.3 miles east). Not far away are Bray Pit and Taplow Lake.
What affects the cost of external mastic
You will get a clear quote before we start. It’s based on:
- Whether old sealant or filler has to be cut out
- Mould in or behind the old joints
- When we can work, for business premises
- How many rooms, windows or areas are involved
Leaving a failed joint generally makes the job bigger, not smaller. If you are not sure whether it needs doing, phone 0345 464 0079 or drop us an email for an honest opinion and a quote.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- How many joints, rooms or windows are involved
- If someone has resealed it before
- Whether it’s a home or a business
- Any access issues, like height or stairs
If you’re in Windsor and need external mastic, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
Landlord and commercial work in Windsor
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
We work for landlords and letting agents as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
More services for Windsor
What happens on the day
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours for a handful of joints, longer for a whole elevation. For a job in Windsor, we need access to where the work is and somewhere nearby to park. For outside work, let us know about side access, gates and any upper-floor joints.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- 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.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Let us know about stairs, lifts or work at height
- Let us know about parking restrictions
Ask for a quote
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll give you a clear price before any work starts.
Related advice
Leave it or put it right?
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. In Windsor, as anywhere, most leaks start as a small gap in a joint, and they’re far easier to fix early.
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. Call for a quick quote and we will explain what it covers.
Why choose Mr Mastic in Windsor
- One-year guarantee on every job
- Sanitary silicone with an anti-fungal additive in wet areas
- 4.9 on Google from 180+ five-star reviews
- We never seal over old sealant
Take a look at what affects the cost and customer reviews.
How the job changes by surface
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. A primer goes on where the product requires one before the bead.
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible year round.
How to look after the new joints
So the new joints stay in good condition:
- Deal with leaking gutters that soak the joints below
- Check the sealant is paintable before painting near it
- Wash walls gently around the sealant
- Do not let climbing plants root in the sealant
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
Questions from Windsor
Can you do external mastic in Windsor?
Yes. We work across London and the South East, and Windsor is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear price.
Can you help a landlord with a rental near Windsor & Eton Central station?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Will it make a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we’re using.
Can you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Do you remove the old sealant?
Yes, every time. New sealant won’t bond properly to old, so the joint is cleaned back first.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Windsor, along with the rest of our area.