Hampshire · England
External & façade joints in Lower Upham, Hampshire
External mastic for Lower Upham, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Hard, crazed mastic that has stopped moving
- Rigid filler in a joint that should flex
- Sealant that has lost its bond to the brick or render
External mastic in Lower Upham: local notes
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as Upham Church of England Aided Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. In the older streets around Church of St Mary, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Lower Upham is about 4 miles east of Eastleigh, in Hampshire. From the centre of Lower Upham to the outskirts, we cover external mastic for every kind of property. Our Hampshire coverage runs to 683 places, Lower Upham among them. You can also see our page for Southampton, roughly 7 miles from Lower Upham.
All of SO32 is covered for external mastic, from the main roads to the quietest streets. Whether your property is on Upham Street, Winchester Road and Portsmouth Road or a nearby road, our applicators can take on the job. If you are just outside Lower Upham, we cover Wintershill (1 mile south), Upham (1 mile north-east), Durley Street (1 mile south), Ashton (1 mile east) and Fair Oak (2 miles west). Within a short drive, we also cover Winchester (6 miles north-west), Gosport (13 miles south), Havant (14 miles south-east), Eastleigh (4 miles west), Fareham (9 miles south) and Horndean (11 miles south-east).
What’s near Lower Upham
Typical jobs here are in homes near Wyvern Technology College, among other places. The nearest railway station is Hedge End station, about 3.4 miles south-west. Nearby you’ll also find Bishop's Waltham Museum (2.2 miles south-east) and Moorgreen Hospital (4.4 miles south-west). For a walk, there’s Bishops Waltham Branch LNR and Twyford Down.
External mastic for homes and businesses in Lower Upham
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 do not skip that step. We work on render & cladding joints, joints between brick and frames and façade panels, and common reasons people get in touch are failed seals between different materials and joints with sealant missing in places.
Outside joints can only be sealed when they’re dry, so work in Lower Upham is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
All our work comes with a 12-month guarantee.
- Location
- Lower Upham (SO32)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. We prime where the sealant needs it before sealing.
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Keeping the joints in good condition
So the new joints stay in good condition:
- Keep soil, plants and ivy away from the joints
- Walk round the building once a year and look at the joints
- Never let anyone fill a movement joint with mortar
- Point out the joints to other trades
Don’t let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Towns and villages near Lower Upham
Other services in Lower Upham
The process
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to several days, depending on the building. Somewhere as small as Lower Upham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- On commercial sites, let us know about site rules
- Tell us if parking is tricky
- Mention if the joints have been sealed before
How to get a quote
Asking for a quote is easy: let us know the job and the location and its rough size. Photos by email help us understand the job, and we’ll take it from there.
Related advice
When it isn’t the sealant
To be straight with you, there are a few things sealant won’t fix:
- Movement that is more than a sealant joint can take
- Walls that need new movement joints cut into them
- Render that’s blown, hollow or coming away
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before you book.
Where we work in Lower Upham
- Render & cladding joints
- Copings & trims
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
Your questions about external mastic in Lower Upham
Do you cover smaller places like Lower Upham?
Yes. Lower Upham is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you help a landlord with a rental near Hedge End station?
Yes. We work for letting agents and landlords as well as householders. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Can new sealant go over the old?
No, and we never do. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Can you seal joints between render and window frames?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll tell you how long to leave the joint.
How do I get a quote for external mastic in Lower Upham?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Do the sealants smell?
Some sealants have a smell while they cure, but it fades. Ventilation helps.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Lower Upham and the rest of Hampshire, along with the rest of our area.
What affects the cost of external mastic
Your quote is based on your job. We take into account:
- Working hours on commercial sites
- The type of sealant required
- Whether old sealant or filler has to be cut out
- The size of the job
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Helping us quote
You do not need to know the technical terms. Just tell us:
- How we’d reach the joints
- The problem you’ve noticed
- Where the job is, and your postcode
- Pictures of the joints, sent by email
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.
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Signs you need external mastic in Lower Upham
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
The problems people normally mention when they call include:
- Moss and dirt in joints with no sealant left
- Weathered mastic that no longer stretches
- Sealant pulling away from one side of the joint
- Failed seals between different materials
If you let a flat or house near Hedge End station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Before you book anyone
- Are they insured?
- Which sealant they’ll use, and why
- How long to leave it before use
- What happens if the job turns out different