Hampshire · England
Horseport External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Horseport, with a one-year guarantee on every job. Ask us for a quote.
- Damp patches traced to an open external joint
- Movement joints with cracked, split or missing sealant
- Failed seals between different materials
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again.
How we handle external mastic in Horseport
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it and we use one wherever it does. We are often asked to deal with failed seals between different materials and rain getting behind render or cladding at a joint, across joints between brick and frames, copings & trims and concrete & block.
Older homes in small places like Horseport may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points.
You’re covered for a year from the day we finish. If anything is not right with it, phone 0345 464 0079 or drop us an email.
- Where
- Horseport (SP6)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What sealant work cannot fix
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Walls that need new movement joints cut into them
- Cracks in the bricks or render themselves, away from the joints
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before you book.
Where we work in Horseport
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Render & cladding joints
How the job changes by surface
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
Cladding and façade panels
If the façade has a specified sealant, that is what we use, or one the system allows. Send us any details you have about the façade.
Signs you need external mastic in Horseport
Weeds, moss and debris in a joint are a sign the sealant has gone. Dirt and roots then trap moisture in the joint and make things worse.
If you can see any of these, it’s time to have the joints looked at:
- Moss and dirt in joints with no sealant left
- Leaking joints around cladding and façade panels
- Rigid filler in a joint that should flex
- Failed seals between different materials
Schools such as Fordingbridge Infant School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
What to look for in a quote
- Whether they’re fully insured
- What guarantee comes with the work
- What the quote includes, VAT included or not
- Which sealant they’ll use, and why
For landlords and businesses
For anyone letting property in or around Horseport, several properties can be quoted together. Just tell us the addresses and what each one needs, and pictures by email help.
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost near the open joint, so the problem grows beyond the joint itself. Around Horseport, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
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 book with us
- White, clear, grey or coloured to suit, where the product allows
- Homes, businesses and hotels
- Neat joints and a tidy finish
- Old sealant always removed completely
Read our cost guide or what customers say.
Also near Horseport
Also in Horseport
The process
You don’t need to clear the whole room or building, just the space around the work. We protect the rest, and the job takes anything from a few hours to several days, depending on the building for a typical job. Somewhere as small as Horseport, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- 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.
Preparing for the visit
- Tell us if parking is tricky
- Move anything stored near the joints
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.
Related advice
Outside joints around Horseport
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. With historic houses such as Breamore House (about 3 miles north) nearby, there’s older building stock in the area around Horseport as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Homes close to St Mary's Church include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Horseport is in Hampshire. Our applicators cover external mastic for householders, landlords and businesses in Horseport, as part of our work across Hampshire. Horseport is one of 683 places in Hampshire we cover for external mastic. Southampton is on our list too, about 17 miles from Horseport.
Postcode districts we cover here for external mastic: SP6. Streets in the area include Bridge Street, Southampton Road and Ringwood Road. Nearby, we also carry out external mastic in Fordingbridge (1 mile north-west), Criddlestyle (1 mile east), Stuckton (1 mile south-east), Lower Burgate (1 mile north) and Tinkers Cross (1 mile north-west). Further out, we also cover Totton (12 miles east), Romsey (14 miles east), New Milton (13 miles south-east), Ringwood (6 miles south), Barton on Sea (14 miles south-east) and Marchwood (15 miles east).
Local landmarks in Horseport
In Horseport, that means homes and buildings near The Burgate School and Sixth Form and The George Inn and the streets around them. Other landmarks nearby include Fordingbridge Doll Museum (less than half a mile west) and Godshill Castle Hill (1.6 miles north-east). Not far away are Blashford Lakes and Linbrook Lake.
Horseport: your questions answered
Do you cover smaller places like Horseport?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you cover Horseport for external mastic?
Yes. We work across London and the South East, and Horseport is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing.
Can you reach joints on upper floors?
Each building is different. Send us photos and a rough idea of the height.
Why is there a gap in my brick wall?
It’s a deliberate gap that lets the wall expand and contract without cracking. It’s sealed with a flexible sealant, not mortar.
Can tenants book the work?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
How long does the job take?
Most jobs take a few hours to a few days, depending on the length of joint and the access, including preparation and clearing up. We’ll confirm how long when we quote.
When is the sealant fully cured?
That depends on the sealant used, so follow the cure time we give you.
Why do you put foam in the joint first?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.