Hampshire · England
Winsor External Mastic
Professional external mastic in and around Winsor, with old sealant always removed completely and a one-year guarantee.
- Rain getting behind render or cladding at a joint
- Joints with sealant missing in places
- Joints pointed up with cement by mistake
External mastic in Winsor
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it and we use one wherever it does. Common call-outs are for weathered mastic that no longer stretches and weeds or debris growing in open joints, across copings & trims, concrete & block and joints between brick and frames.
In a village or hamlet like Winsor, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
We stand behind the work with a 12-month guarantee, so you are not left on your own once the job is done.
- Location
- Winsor (SO40)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens if it’s left?
Sealing over the top of old mastic doesn’t hold for long. New sealant doesn’t bond well to old, weathered sealant, so the old joint is cut out fully first. Where a wall is exposed, as many are in small places like Winsor, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
Why us?
- 4.9 on Google from 180+ five-star reviews
- Neat joints and a tidy finish
- Old sealant always removed completely
- A 12-month guarantee on all work
Read our cost guide or what customers say.
What affects the cost of external mastic
Jobs vary more than people expect. What affects the quote:
- Whether there’s mould to deal with
- Access and height
- Which sealant suits the joint
- Any working-time requirements on site
Leaving a failed joint generally makes the job bigger, not smaller. If you are not sure whether it needs doing, ring 0345 464 0079 or email us for an honest opinion and a quote.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- Access, such as stairs, a lift or height
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
- How many joints, rooms or windows are involved
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or email us.
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Keep movement joints as flexible joints, not mortar
- Tell anyone working on the walls about the movement joints
- Wash walls gently around the sealant
- Clear growth from the base of walls and joints
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
What external mastic looks like in Winsor
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.
If you live in an older home near Church of St Mary, an extension built onto an older house moves differently, and the joint between them takes the strain. Schools such as Copythorne CofE Infant School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Winsor is about 2 miles west of Totton, in Hampshire. Wherever you are in the SO40 postcode area, we can carry out external mastic at your property. Winsor is one of 683 places in Hampshire we cover for external mastic. We also work in Southampton, about 7 miles from Winsor.
Every address in SO40 is covered for external mastic, from the main roads to the quietest streets. External mastic is available to properties on Winsor Road, Winsor Lane and Pound Lane and the roads around them. Nearby, we also carry out external mastic in Copythorne (1 mile north-west), Bartley (1 mile south-west), Netley Marsh (1 mile south-east), Cadnam (1 mile west) and Newbridge (1 mile north-west). Further out, we also cover Winchester (14 miles north-east), Eastleigh (9 miles east), Chandler's Ford (8 miles north-east), Hedge End (11 miles east), Lymington (12 miles south) and Romsey (6 miles north-east).
Near you in Winsor
In Winsor, that means homes and buildings near Compass Inn. The closest station to Winsor is Ashurst New Forest station, about 2.7 miles south-east of the centre. Well-known places in the area include Tatchbury Mount Hospital (1 mile east) and Eling Experience (2.7 miles east). Not far away are Copythorne Common.
Your questions about external mastic in Winsor
Will you come out to Winsor?
Yes. Winsor is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Winsor for external mastic?
Yes. We work across London and the South East, and Winsor is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
How long should I leave it?
Different products cure at different speeds, so follow the cure time we give you when we finish.
Can landlords and businesses book you?
Yes, often. We can quote for several properties at once.
Will there be a smell?
That depends on the sealant. Some products have a noticeable smell, others very little.
What sealant do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
What colours does the sealant come in?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render.
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.
The process
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours for a handful of joints, longer for a whole elevation. In a small place like Winsor, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Move anything stored near the joints
- Tell us if parking is tricky
Ask for a quote
For a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
Read more
What the job involves on each surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod coloured to suit the wall.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
Honest limits
It helps to know what we can’t do too:
- Failed render or damaged cladding panels
- Rising or penetrating damp from elsewhere in the wall
- Subsidence or other structural problems
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Surfaces we seal
- Joints between brick and frames
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Render & cladding joints
- Façade panels
Common problems we fix in Winsor
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. All of that ends up in the joint sealant.
It’s worth asking for a quote if you see:
- Failed seals between different materials
- Movement joints filled with mortar instead of sealant
- Leaking joints around cladding and façade panels
- Old sealant gone brittle and cracked
Rented homes near Ashurst New Forest station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
What your quote should include
- Whether VAT is included
- When the joint can take water or movement
- Who does the work, and how experienced they are
- How long the guarantee is